Answer:
B. Case-Control
Explanation:
A case-control is a study that compares a group with an outcome of interest (cases) with a group who do not have the outcome (controls). This study aims to looks back retrospectively to compare how frequently the exposure to a risk factor is present in each group and with that to determine the relationship between that risk factor and the outcome.
So in this case, the cases are children with pervasive development disorder and the control is those without the disorders.
These studies are normally observational because no intervention is attempted.
Which term describes the length of time a microbial species needs in order to divide?
Answer:
The correct answer is - generation Time.
Explanation:
Generation time is the average time between 2 generations that are come one after another in the ancestry of a species or population. In microbiology, the generation time is also similar but define as the time a microbe such as bacteria takes for the population or species to divide to double or doubling time.
The generation time of the microbes like bacteria varies from 12 minutes up to 24 hours whereas generation time of coliform's generation time is 12 to 24 hours.
Thus, the correct answer is - generation time.
Answer: Generation time or doubling time
Explanation:
The generation time or the doubling time is the time by which the bacterial population doubles.
Binary fusion can be defined as the method by which the population of the bacteria gets double in number or value.
It is very helpful in case of extraction of resources and consumption of resources and many more.
This length of time is known as doubling time or generation time.
The "central dogma" of biology explains how life arose on this planet? A) The union of sperm and egg creates the next generation. B) New species evolve. C) Information stored in DNA comes to life in two fundamental steps. D) DNA is replicated
The question is incorrect. The correct question is:
Question: The "central dogma" of biology explains how
a) life arose on this planet
b) The union of sperm and egg creates the next generation.
c) New species evolve.
d) Information stored in DNA comes to life in two fundamental steps.
e) DNA is replicated
Answer:
d) Information stored in DNA comes to life in two fundamental steps.
Explanation:
According to the central dogma, the genetic information is stored in the nucleotide sequence of DNA molecules. The genetic information of DNA is copied into RNA molecules by the process of transcription. The process of transcription includes the formation of RNA molecules having a nucleotide sequence complementary to that of the template DNA strand.
The mRNA molecule then serves as a template for protein synthesis. The nucleotide sequence of mRNA is read in the form of triplet codons and each codon specifies a particular amino acid to be added to the polypeptide chain. Therefore, the genetic information stored in DNA is converted into amino acid sequences of specific proteins in two steps: transcription and translation.
The inactive form of a vitamin that can be converted into an active form upon absorption or in the liver is called a(n) __________. __________ is an example of this.
Answer:
provitamin, beta-carotene
Explanation:
Beta-carotene is an example of a provitamin. It is a less active form of retinol (Vitamin A) that is synthesized by plants. Animals i.e. humans, cannot synthesize or make use of this form of Vitamin A. It can only be made available for use in humans through normal metabolic processes. Humans can access this provitamin by consuming food that is rich in beta-carotene. When beta-carotene undergoes normal metabolic processes in the body, it is transformed into retinol, which is an active form of Vitamin A. Vitamin A is needed by humans for healthy skin, good vision and eye health, as well as maintaining strong immune system.
The thin layer of white blood cells and platelets found above the packed red cells in centrifuged blood is called the ______
Answer:
Buffy coat.
Explanation:
Between the plasma, and red blood cells the platelets, and white blood cells form a thin white layer which is known as Buffy coat following density gradient centrifugation of the blood.
Centrifugation is the process where the distinguish between cell fragments, and cell from the liquid intracellular matrix occurs. Centrifugation is a technique which separates the particles according to their size, density, viscosity and shape with the help of centrifugal force.
The distinguishing characteristic between birds and all other organisms is ________.
Answer:the possession of feathers
Explanation:birds are warm blooded animals , that possess feathers.these feathers cover their bodies and used for flight and warmth.their forelimbs are modified into wings,which fold into a Z shape at rest.feathers grow from the skin follicles and are replaced by scales on their legs.they possess oil gland to dress the feathers.
Other features of birds include
1) beaks with no teeth
2) fully ossified bones with air cavities
3)females with left ovary and oviducts only
Cell communication is critical for the function of both unicellular and multicellular eukaryotes. Which of the following is likely true of cell signaling?
(A) Cell signaling uses the highest molecularweight molecules found in living cells.
(B) Cell signaling has largely been replaced byother cell functions in higher mammals.
(C) Similar cell signaling pathways in diverseeukaryotes are evidence of conservedevolutionary processes.
(D) Cell signaling functions mainly during earlydevelopmental stages.
Answer:
Similar cell signaling pathways in diverse eukaryotes are evidence of conserved evolutionary processes.
Explanation:
Cells communicate by signaling one another using chemical compounds. A signaling molecule binds to a receptor molecule on the cell surface or within the target cell to transduce the signal and to generate the desired cellular response. Cell signaling pathways are important for cell-cell communication in both unicellular and multicellular eukaryotes. Several signaling pathways are conserved and are exhibited by diverse groups of eukaryotes.
For example, cAMP serves as a second messenger in both unicellular and multicellular eukaryotes and serves to relay a signal from the plasma membrane to protein in the cytosol. The cAMP serves as the second messenger in amoeba-like cellular slime mold such as Dictyostelium under the conditions of food scarcity and directs the movement of several slime molds to form a multicellular slug-shaped colony.
The cell accepts, processes and transfers signal to connect the outer and inner environment through cell communication and signalling. It is a necessary attribute in living organisms.
The correct answer is:
Option C. Similar cell signalling pathways in diverse eukaryotes are evidence of conserved evolutionary processes.
In a cell signalling groups of molecules work together to bring about a chemical reaction that controls the cell functioning.Cell surfaces have receptors for binding of the signalling molecules that induce the signal and produces the cellular responses. Cell signalling is very important for cell communication in majorly all types of eukaryotes.For example, cell signalling in the yeast uses an endocrine pathway that is similar to the insulin signalling pathway of humans.Therefore, similar signalling pathways in diverse bare evidence of conserved evolutionary processes.
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what are all the possible sources of genetic variation in sexuaally repdoucing organisms?
Answer:
Mutation, Gene flow/Migration/Immigration of gene and Recombination
Explanation:
For any species there are majorly three sources of genetic variations –
a) Mutation – This leads to change in the genetic code with in the DNA of an organism. Sometimes mutation does not produce any effect on the organism. Mutation can produce both positive and negative impact. Its effect is observed in long run as its rate is slow.
b) Recombination – When an organism undergoes sex, his/her genes recombine with the genes of mating partner. The rate of recombination is faster than the rate of mutation
c) Gene flow /Migration/Immigration of gene – In this gene travel from one set of population to the other. The frequency of gene in the mixed population lies between the original population gene frequency and the migrated or donor population gene frequency
Indications for use of anticholinergic drugs in the treatment for Parkinsonism include to?
Answer:
decrease salivation, spasticity, and tremors.
Explanation:
Parkinson's disease is a nervous system disorder in which body movements starts slowing down. In early stages, involuntary movements like the shaking of a hand occur which is called tremors and it gets worse over time which includes symptoms like salivation, loss of automatic movements, spasticity, etc.
Anticholinergic drugs block the action neurotransmitter like acetylcholine which helps in transferring signals among different cells. It is used in the treatment of parkinsonism because it decreases and block involuntary muscle movement thereby decrease salivation, spasticity, and tremors.
The total collection of alleles in a population at any one time makes up that population's ________.a. genotypeb. gene poolc. allele frequencyd. heterozygote frequency
Organisms that live in the rainforest have developed unique adaptations that aid in their survival. The greater yellow-headed vulture is found in undisturbed lowland tropical forests of the Amazon basin. It tracks down carrion to feed on by detecting the production of ethyl mercaptan, a gas that is produced at the beginning of animal decay.
Answer:
Acute sense of smell.
Explanation:
Rain forests are the forests that are characterized by their continuous and highest rainfall. Two main types of rain forest are tropical rain forest and temperate run forest.
The living organisms live in the rain forest gets adapt well in their environment. The organisms have well adapted sense of smell that helps to protect themselves from their enemies and increase their chances of survival. The organisms have well developed scent glands to smell the gas ethyl mercaptan.
Thus, the answer is acute sense of smell.
Answer:
a
Explanation:
What mass of glucose can be produced from a photosynthesis reaction that occurs using 10 mol CO2?
Answer: 21
Explanations: because 9+10 =21
Which organism in the food web below gets energy directly from ants?
Answer: a wattle tree
Explanation:
For young and middle age adults, ________ is the single most important physical fitness component for enhancing and maintaining good health.a. body compositionb. cardiorespiratory endurancec. monitor daily physical activityd. research exercise facilities and equipmente. stop negative behavior that hinders activeness
Answer:
The answer is B.
Explanation:
For just about everyone but especially for young and middle aged adults, because of their expected level of physical fitness, the single most important physical fitness component is "Cardiorespiratory Endurance" which is the term to measure how one's lungs, muscles and heart keep up together with intense exercise over a long period of time. Cardiorespiratory Endurance can be increased by correct nutrition and regular work-out sessions.
I hope this answer helps.
What are the three factors that contribute to water scarcity?
a) Climate change, ocean droughts, and water pollution.
b) Hurricanes, overuse of groundwater, and water pollution.
c) Climate change, overuse of groundwater, and water pollution.
d) El niño, hurricanes, and ocean drought.
Answer:
c) Climate change, overuse of groundwater, and water pollution
Climate change: Increase in temperature leads to and increase in water evaporation and also affect the amosphere's ability to keep water in
Overuse of water: Many people living in more priviledged countries consume excess water than needed (eg: some people leave the tap running while brushing their teeth)
Water pollution: I don't think I need to explain this one
Answer:
C
Explanation:
What are the three sections of the small intestine and what role does each section play in digestion or absorption?
Answer:
The three sections of the small intestine are the duodenum,
Explanation:
The duodenum
It receives chyme from the stomachs
Its intestinal cells enzymes such as secrete amylase, sucrase, and lipase enzymes that break down fats and sugars.
The jejunum
It is covered in villi and microvilli giving the name THE PRINCIPAL SITE of digestion.
the ileum.
Aid absorption e.g. amino acids, lipids, fat-soluble vitamins, and vitamin B12.
Answer:
The three sections of the small intestine are the duodenum, jejunum and the ileum
Explanation:
Duodenum: The beginning and the shortest part of the small intestine where iron is absorbed. Duodenum is shaped like a letter "C.
Food passes from the stomach to duodenum through a muscle called the pyloric sphincter.
Jejunum: The middle part of the small intestine where sugars, amino acids, and fatty acids are absorbed.
Ileum: The last part of the small intestine where vitamin B12, bile acids, and other nutrients are absorbed
Which drug is derived from a natural source and may be prescribed for the treatment of osteoporosis?
Answer:
Teriparatide and
Calcitonin
Explanation:
Teriparatide drug is extracted from the naturally occurring parathyroid hormone and is also approved by the FDA. This anabolic is taken through injection to promote the growth of bones and increase its density as well.
Along with Teriparatide, Calcitonin is a natural hromone produced by thyroid and is given to patient with osteoporosis. Calcitonin increases the bone mass and density.
Identify the pairs of rates as equivalent or not equivalent.
Answer:
These fractions are equivalent:
3/14= 21/98, 9/12= 21/28, 2/14= 1/7 and 3/21= 1/7.
These fractions are not equivalent:
3/7 is not equivalent to 1/7, 2/5 is not equal to 1/4.
Explanation:
Fractions are said to be equivalent if when the numerator of one is divided by the its denominator and the answers are the same when same is done.
Fractions are said not to be equivalent if when the numerator is divided by the denominator of one, then, the result is different from the other fraction when same is done.
Which group of prokaryotes aids digestion in cattle, deer, and other animals that obtain nutrition from cellulose?
Answer:
Methanogens are group of prokaryotes that aids digestion in cattle, deer, and other animals that obtain nutrition from cellulose.
Explanation:
Methanogens are microorganisms capable of methane production. They belong to the domain Archaea. Methanogenic archaea which reside primarily in the rumen produces methane through the reduction of methanol with hydrogen. Methane produced by the methanogens aids in keeping the hydrogen concentrations low in the rumen, this allows the growth of other species which in turns enable more efficient fermentation.
The majority of the anaerobic microbes which occupy the rumen initiate the fermentation process thereby assisting the cellulose breakdown. Methanogens uses the end products of fermentation as substrates to reduce carbon dioxide, formic acid, or methylamines to methane.
Some terms explained:
Prokaryotes: are unicellular organisms and they do not have nucleus that houses their genetic material. Examples are organisms like bacteria, methanogens.
Ruminant: They include cattle, deer, goat. They have a unique digestive system which comprises of four-compartment stomach (rumen, reticulum, omasum, and abomasum). With the help of microbes in the specialized somach, they are able to ferment ingested forages to aquire nutrients.
Which of the following types of reproductive barriers separates a pair of insect species that could interbreed except that one mates on goldenrod flowers and the other on autumn daisies that both blossom at the same time?
A) temporal isolation
B) habitat isolation
C) behavioral isolation
D) mechanical isolation
E) gametic isolation
Answer:
Answer is B, habitat isolation.
Explanation:
Habitat isolation can simply be explained as a situation whereby two insects or organisms of the same species, that have the ability to meet and reproduce could not, because they are living in different habitats.
These different habitats might even be in the same geographical location or area. That is, one insect might be living in or on the surface of the water, and the other living in the soil or the tree. Due to this effect, the insects are unlikely to meet and reproduce.
Which of the following is related to the likelihood that a mother develops postpartum depression?
a. Symptoms of depression during or after a previous pregnancy
b. Previous experience with depression or bipolar disorder at another time in her life
c. A family member who has been diagnosed with depression or other mental illness
d. A stressful life event during pregnancy or shortly after giving birth, such as job loss, death of a loved one, domestic violence, or personal illness
e. All of the above
Answer:
Option D
Explanation:
Postpartum depression is majorly experienced in woman who has recently entered into motherhood. This form of depression arises because of the complications involved in a child birth. It is strongly driven by sudden changes that come up in the life of a woman after becoming mother such as – loss of job, responsibility of child, tight life schedule etc. some common symptoms of this problem include – mood swing, anxiety, sleeplessness, crying etc.
Hence, option D is correct
Cell signaling involves converting extracellular signals to specific responses inside the target cell. Different molecules are involved at each stage of the process. In this activity, you will sort items based on which stage they are involved in:
a) reception.
b) transduction.
c) response.
Answer:
Each cell can receive and respond to signals that they get from their surroundings. The three stages involved in transduction are reception, transduction, and response.
Reception: It involves receptor molecules and inducers. Receptors can be intracellular or extracellular. Receptors like G- protein-coupled receptor, receptor tyrosine kinase, and signaling molecules are the items that come under reception.
Transduction: In transduction, signals are transferred from outside of the cell to the inside of the cell. Secondary messengers are majorly involved in signal transduction like cAMP, cGMP, IP3, Ca2+, nitric oxide, etc.
Response: The response of cell signaling includes processes like protein synthesis, cell division, cell growth, etc.
A food scientist is developing a new and improved cereal bar. She consults with you to about the ordering of the ingredients on a food label. The ingredients are: Sugar: 30 g, Puffed wheat: 28 g, Dry milk powder: 5 g, Red food coloring: 35 mg, Salt: 2 g. What is the appropriate order in which to list these ingredients on the food label?
Answer:
Sugar – 30 g
Puffed Wheat – 28 g
Dry milk powder- 5 g
Salt – 2 g
Explanation:
The very basic rule of listing the ingredients in any food item are as follows –
a) The item with the maximum weight must be placed at the top
b) The item with the lowest weight must be placed at the bottom
c) Any ingredient whose weight < 5% of the total food weight, then it must not be listed.
Based on the above rule, the correct order of ingredient list is
Sugar – 30 g
Puffed Wheat – 28 g
Dry milk powder- 5 g
Salt – 2 g
No need to put Red food coloring in the list
The protein coat that surrounds the genetic material of the T2 phage is termed the:______
A) Capsid.
B) Envelope.
C) Nucleoid.
D) Membrane.
E) Cell wall.
Answer:
Th correct answer is A. Capsid
Explanation:
T-2 phage is a bacteriophage which is virulent to E.coli which means T2 phage infects E.coli. The genetic material of T2 phage is linear DNA which is double-stranded. The genetic material of T2 phage is enclosed in a protein coat which is called capsid.
This capsid protects the genetic material of bacteriophage by any enzymatic digestion, helps the virus to attach the host cell and helps the virion to penetrate the cell membrane of the host cell and inject its genetic material in the host cell. Therefore capsid is the correct answer.
Collectively, which group of organisms are the most diverse representatives of life?
Answer:
the most diverse group of organisms are the " insects".
Explanation:
the group of organisms which are the most diverse representatives of life include the " insects". they have a vast variety and are extremely large in numbers and have a variety of species.
insects colonize nearly every corner and nook of the globe.
they have evolved from very simple to complex organisms.
Bacteria are the most diverse group of species on Earth.
When considering the full variety of life, or species diversity, there is an astounding range of organisms on Earth. Estimates suggest that Earth's biodiversity includes somewhere between 1 to 6 billion distinct species. Among these, the most diverse group of species is bacteria, which belong to one of the three major lineages of life along with Archaea and Eukaryotes.
Bacteria, as single-celled organisms, exhibit a vast array of characteristics and exist in virtually every environment on Earth. They demonstrate incredible adaptability and genetic diversity, which contributes to their overwhelming numbers.
Which statement correctly identifies an enzyme involved in DNA replication and describes its primary function?
A. Ligase catalyzes the binding of RNA primers to DNA via phosphodiester bonds.
B. Primase catalyzes the replacement of RNA primer nucleotides with DNA nucleotides.
C. Helicase catalyzes the separation of the parent DNA strands at the origin of replication.
D. Topoisomerase catalyzes the joining of adjacent Okazaki fragments into a continuous strand of DNA.
Answer:
C. Helicase catalyzes the separation of the parent DNA strands at the origin of replication.
Explanation:
DNA is a double-stranded structure which must be converted into single-stranded to be replicated. So the two parent strands must be separated at the origin of replication by an enzyme and that enzyme is called DNA helicase.
This DNA helicase breaks the hydrogen bond between two DNA strands and creates a replication fork between the two strands of DNA which helps in converting the double-stranded DNA into a single strand.
The Single-stranded binding protein attaches to each strand and so that the two separated parent strand do not get annealed again. So the right answer is C.
In late adulthood, Mr. Klondike has become increasingly likely to make a socially impolite remarks about other people's appearance or mannerisms. His blunt comments are most likely to indicate late life atrophy of the _____ lobes.
Answer:
frontal
Explanation:
In a mammalian brain, there are four major lobes that are present and one of them is the frontal lobe.The frontal lobe is mainly rich in dopaminergic neurons and thus, it is mainly concerned with functions such as memory, reward, motivation, planning, attention, etc.The process of break down of tissues and cell death in the tissues is referred to as atrophy and since the frontal lobe is associated with the functions as mentioned above its atrophy would lead to a slow decline in these functions.Since Mr. Klondlike behavior is changing his blunt comments are most likely a result of atrophy of the frontal lobe.Steroid hormones exert their action by ________. A. entering the nucleus of a cell and initiating or altering the expression of a gene B. binding cell receptors and initiating cAMP activity C. entering the cell and activating mitochondrial DNA D. activating the hypothalamic release of regulating hormones
Answer:
The correct option is A. Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.
Explanation:
Steroid hormones are derived from cholesterol and regulate multiple biological processes. All steroid hormones exert their action by crossing the plasma membrane and by binding with their respective intracellular receptors. They stimulate cell growth in a very different way, their lipophilic nature gives them the ability to cross lipid barriers, so, without the need for extracellular signals, these hormones can easily enter the cell, cross the cytoplasm and reach the nucleus. There they bind to specific receptors that are associated with DNA promoter regions, modifying their structure and promoting the expression of the genes under their control.
Steroid hormones work by entering the nucleus of a cell and initiating or altering the expression of a gene. They do this by forming a hormone-receptor complex with specific receptors in the cytoplasm before going into the nucleus.
Explanation:Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene. Unlike many hormones that bind to receptors on the cell surface and initiate a signal cascade, such as cAMP activity, steroid hormones can pass through the cell membrane because they are lipophilic. Once inside the cell, they bind to specific receptors in the cytoplasm, forming a hormone-receptor complex. This complex then enters the nucleus and binds to specific genes, initiating or altering their expression, thus influencing the cell's function. It is no the case that these hormones would activate mitochondrial DNA or instigate the hypothalamic release of regulating hormones.
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In figure 13-3 which code specifies the same amino acid as UAU
Answer:The answer is A. UAC
Explanation:
What is the recommended protein intake for masters-level athletes engaged in muscle strengthening exercises?
Answer:
40 grams per kg of body weight
Explanation:
Protein are known as the building blocks of muscle and hence are responsible for its building and strengthening. Therefore researchers suggest taking protein after any rigorous exercise or workouts. The standard quantity of protein recommended is 20 grams after 1 hour of exercise. However, high strength athlete must take not less than 40 grams per kg of body weight.
Proteins are essential for muscle repair after intense exercise session.
A client has had cholestyramine added to his or her treatment plan for dyslipidemia. What effect will cholestyramine have on the pharmacokinetics of the thiazide diuretic that the client is currently prescribed?
Answer:
decrease absorption
Explanation:
Cholestyramine has been discovered to cause serum aminotransferase elevations in some cases when combined with thiazide diuretics. This is because the cholesyramine is not absorbed, hence it becomes surprising that it have been discovered to cause asymptomatic serum enzyme elevations.