Answer:
B
Explanation:
Final answer:
The brain shows the highest level of activity similar to wakefulness during the REM stage of sleep, which normally occurs toward the end of each sleep cycle. So the correct option is C. the end of each sleep cycle.
Explanation:
The brain is most active during different portions of the sleep cycle. While we do go through stages of lighter and deeper sleep, the brain does not simply shut off. Instead, the brain goes through a series of complicated chemical changes and displays various brainwave activities throughout these stages. The REM portion of the sleep cycle, in particular, shows brainwave patterns that are very similar to those during wakefulness. If we're discussing the peak activity in terms of brainwave similarity to an awake state, the brain is most active during the REM stage, which tends to happen toward the end of each sleep cycle. Therefore, the answer to the question would be C. the end of each sleep cycle.
energy for use is stored in the form of
Dr. Digger, a paleontologist, finds a fossil that he describes in his journal.
The creature was approximately 1 meter long, with its backbone fused into a large shell covering the body cavity. It had a beaklike mouth, without teeth, and all four limbs were in the form of flippers.
Based on anatomical similarities, to which modern animal is Dr. Digger’s creature most closely related?
zebra
bony fish
sea turtle
snake
you carry a 20.N bag of dog food up a 6.0 m flight of stairs.how much work was done
Answer:
[tex]120[/tex] N-m
Explanation:
Work done is equal to the product of mass of an object and the distance by which it is displaced.
Hence, mathematically the relationship between work done (W), Mass of an object (M) and its displacement (D) is equal to
[tex]W = M * D[/tex]
Substituting the given values in above equation, we get -
[tex]W = 20 * 6\\W = 120[/tex] N-m
Hence, work of [tex]120[/tex] N-m is done here
Which step of mitosis involves the spindle fibers pulling the chromosomes to opposite ends of the cell?
Answer:
D: Telophase
Explanation:
A teacher asked each student in the class to make a model demonstrating the importance of solar energy for life on Earth. Which model should a student make?
A. A model of the electromagnetic spectrum
B. A model of a local food web
C. A model of the water cycle
D. A model of a mitochondrial matrix
Can you put this in order from smallest to largest? the list is: chromosome, gene, organ system, tissue, organism, organ, nucleus, nucleotide base pair, cell.
Why does the enzyme trypsin get deactivated when introduced in the gastric juice of the stomach?
In which of the following ways is DNA replication different from DNA transcription? A) New cells can only be created after transcription has taken place. B) Replication results in mRNA strands while transcription creates new DNA. C) Transcription happens outside the nucleus and replication happens inside the nucleus. D) Thymine is used in replication while uracil is used in transcription.
Answer: Option D
Explanation:
At the time of DNA replication the nitrogenous bases used is thymine because DNA is the end product of replication.
Whereas, in case of translation the end product is mRNA in which the nitrogenous base used is uracil.
Both of the process combinely helps in cell division and formation of new cells.The proliferation of cell is very crucial and important step inside the cell.
Plant growth caused by external stimulus is _____.
A. tropism
B. homeostasis
C. gibberllin
D. hormone
Answer: The correct answer for the blank is-
A. tropism.
Tropism is a biological process that indicates growth of a plant in a particular direction in response to any external stimuli (any change in the environment that induces a specific response in a biological system).
For example - Phototropism in plants is a type of tropism process in which plants tend to grow towards the direction of sunlight.
Thus, option A) is the right answer.
why do plants not need heterotrophs
Predict the next digestive system organ in the following sequence:
mouth, pharynx, esophagus, stomach, _______
A)
liver
B)
kidneys
C)
small intestine
D)
large intestine
The correct answer is option C
The small intestine known as Duodenum is the next organ in the digestive system. Liver comes before the stomach and the large intestine surrounds the small intestine and its function also starts when the di-gested food passes from the small intestine to the large intestine. Kidney is the part of urinary system and not the digestive system.
The benefits of space exploration are purely scientific and do not lend themselves to military or medical applications.
True
False
What is the TECTONIC CYCLE? Briefly summarize it.
Which if the following is NOT a product of the Krebs Cycle?
A) water
B) carbon dioxide
C) ATP or GTP
D) FADH2
The following is NOT a product of the Krebs Cycle is FADH2. The correct option is D.
What is the Krebs Cycle?The Krebs cycle is also called the tricarboxylic acid and citric acid cycle. This cycle works under aerobic conditions. This produces energy in bodies. Krebs cycle converts acetyl CoA molecules into NADH.
Pyruvic acid and acetyl-CoA combine to create glucose in this mechanism. The Krebs cycle, commonly known as the aerobic stage because it takes place in the presence of oxygen, is the second step of cellular respiration.
Given that anaerobic organisms cannot survive in the presence of oxygen, we might infer from this that not all living things participate in the Krebs cycle. NADH is not produced in this cycle.
Therefore, the correct option is D. FADH2.
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Paisley wants to prepare a graph of the rate of growth of a lentil seedling. Which factors would be the independent and dependent variables? The height of the lentil seedling would be an independent variable and the length of the leaves the dependent variable. The height of the lentil seedling would be an independent variable and the time passed would be the dependent variable. The time passed would be an independent variable and the height of the lentil seedling would be the dependent variable. NextReset
Answer:
The time passed would be an independent variable and the height of the lentil seedling would be the dependent variable.
Explanation:
The actual variable a researcher sets out to measure during the course of a research is the dependent variable. It is measured to determine how its response to variation in the independent variable.
The independent variable is the one that is usually manipulated or changed during the course of a research or experiment. The effect it creates is determined by measuring the dependent variable.
Hence, in a graph of growth rate of a plant, a growth measuring factor (such as height, number of leaves, branching, etc.) serves as the dependent variable while time will serve as the independent variable.
Therefore, in the case of Paisely, the height of the lentil seedling would be a dependent variable and the time passed would be the independent variable.
Which structures are connected to the peripheral nervous system?
Fish populations and other aquatic resources are likely to be affected by changes in what aquatic factors? a. water temperatures b. disease c. water quality d. all of the above Fish populations and other aquatic resources are likely to be affected by changes in what aquatic factors: water temperatures
The correct answer is - d. all of the above.
The fish populations and other aquatic resources can be affected by multiple factors. The water temperature is a defining factor, if it is colder than lots of marine life will dye out and be replaced with other species, and vice versa, if its too warm lots of marine life adapted to colder conditions will die out. Diseases are always an impact factor in any environment, so if a dangerous, fatal, disease appears, it can demolish the populations of the aquatic organisms. The water quality is becoming an ever-growing concern, and that is because of the human activity. If the water gets polluted, or eutrophicized, the marine life will very quickly die out and leave empty waters behind it.
The taxonomic reference for raccoons is Eukarya, Animalia, Chordata, Mammalia, Carnivora, Procyonidae, Procyon, lotor.
Raccoons belong to which family?
A.
Procyonidae
B.
Animalia
C.
Mammalia
D.
Carnivora
Raccoons belong to the family Procyonidae. This family is part of a hierarchical taxonomic classification system used in biology to organize and understand relationships between organisms.
Explanation:The raccoons belong to the family Procyonidae. This classification is part of the taxonomic hierarchy, which categorizes living organisms in a ranked structure from broad to specific. The hierarchy includes the domain Eukarya, followed by the kingdom Animalia, the phylum Chordata, class Mammalia, and then progresses to the order Carnivora. Within this order, we find the family Procyonidae, which includes the genus Procyon, and finally the species lotor, signifying the common raccoon with the scientific name Procyon lotor. Taxonomic classification is important in biology as it helps scientists organize and understand the relationships between different organisms. Each level of classification from kingdom down to species is referred to as a taxon.
How do the mitochondria and vacuole work together?
Mitochondria and vacuoles perform distinct roles within a cell, with the mitochondria providing energy through cellular respiration, and the vacuoles storing water, nutrients, and waste and maintaining the shape of the cell. The energy provided by the mitochondria is critical for the function of the vacuoles, and indeed all other parts of the cell.
Explanation:The mitochondria and vacuole in a cell carry out distinct but interconnected roles. The mitochondria, often called the 'powerhouse of the cell', is where cellular respiration occurs. This process converts energy stored in nutrient molecules such as glucose into adenosine triphosphate (ATP), a form of energy that the cell can use.
On the other hand, vacuoles serve as a storage and transport system. They not only store water, nutrients, and waste products, but also help in maintaining the shape of the cell. In plants, enzymes within vacuoles can break down macromolecules. Some vacuoles, known as contractile vacuoles, can excrete excess water and waste from the cell through a process called endocytosis, where the vacuoles merge with the cell membrane and expel waste into the environment.
While their functions may seem separate, the energy provided by the mitochondria is critical for the function of the vacuoles, and indeed all other parts of the cell. Thus, the mitochondria and vacuoles work together to ensure the cell can function and survive.
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A cell with 5% salute concentration is placed in a beaker with a 1% salute concentration what will happen to the cell overtime
Which of the following is released during cellular respiration?
Which of the test tubes shown below were most likely produced by a sprig of Elodea and a snail in the dark after 24 hours of incubation?
Answer:
The correct answer is - test tube 4.
Explanation:
The sprig of Elodea produces carbon dioxide and oxygen after the incubation of 24 hours whereas the snail releases the oxygen in the test tube during the incubation period. The presence of both gases gives a yellowish color to the test tube solution.
Incubation is the process in which organisms or anything at a precise environment and temperature so it can develop properly.
Thus, the correct answer is- test tube 4.
The climate and features of the earth are always changing. some populations have been able to survive by adapting to the changes. which characteristic of a population is most vital for allowing adaptation?
Answer:
genetic variation
Explanation:
trust in me
When discussing the Earth's magnetic field we could say that the Earth has a
Answer:
When discussing the Earth's magnetic field we could say that the Earth has a GEOMAGNETIC NORTH POLE. The magnetic field changes every several hundred thousand years and thus the north and south magnetic poles swap places. Hope this is the answer that you are looking for.
North Magnetic Pole
Explanation:
The terrestrial magnetic field is what makes possible the existence of compasses, used for location in space. Thanks to this invention, the great navigations could happen.
The dynamo theory is the most accepted for the explanation of the terrestrial magnetic field. According to this idea, iron and molten nickel, about 3,000 km deep, move around generating electrical currents that trigger the magnetic field.
Magnetic poles
A magnet has a north pole and a south pole. The magnetic field generated by the magnets, which is the region near the magnet where another magnet or materials such as iron and steel are attracted, is represented by exiting the north pole and entering the south pole.
When the magnetized needle of a compass aligns with the earth's magnetic field, the north pole of the needle points to the northern region of the planet and the south pole of the compass magnet points to the southern region of the planet.
The attraction occurs only between different poles, that is, if the north pole of the needle points to the geographic north, it means that what we call geographic north is the magnetic south pole of the earth. Similarly, the geographic south pole of the planet must be the magnetic north pole. The image above reveals this inversion between the magnetic and geographic poles.
The earth is a giant magnet, and its magnetic field protects us from particles from the sun.
An explanation for certain behaviors or occurrences which have happened or will happen that is based on many tests and examples is a
scientific theory.
science experiment.
research question.
variable.
Answer:
Scientifc therory is the correct answer
Explanation:
Which materials are included in the hydrosphere that are not in liquid form?
A.
rainforests and lakes
B.
glaciers and polar ice caps
C.
rocks and minerals
D.
lakes and rivers
The right answer is B. glaciers and polar ice caps.
The hydrosphere is the part of the globe occupied by water (or ice). it includes oceans, rivers, lakes, glaciers, polar ice caps...
Glaciers and polar ice caps are the only solid elements in the hydrosphere (rocks and minerals are not part of the hydrosphere but the lithosphere).
The hydrosphere includes materials that are not in liquid form, such as glaciers and polar ice caps, which are the largest stores of fresh water, greater than groundwater, lakes, and streams.
Explanation:The materials included in the hydrosphere that are not in liquid form are glaciers and polar ice caps. These represent significant stores of freshwater and are part of the Earth's hydrosphere, even though they are in solid form. The largest store of fresh water in the hydrosphere is not the ocean, but rather glaciers and ice caps, followed by groundwater. The majority of Earth's freshwater is locked up in these reservoirs, vastly more than what is found in lakes and streams.
What is the correct sequence of events in transcription and translation?
A. RNA to DNA to protein
B. DNA to RNA to protein
C. DNA to RNA to lipids
The correct sequence of events in gene expression is DNA to RNA to protein, starting with transcription and followed by translation. In transcription, DNA is transcribed into mRNA, which is then translated into a protein with the help of tRNA. cDNA helps in understanding an organism's proteins by representing only expressed genes.
Explanation:The correct sequence of events in transcription and translation is DNA to RNA to protein. The process starts with transcription where DNA is converted into mRNA (messenger RNA). This happens in the nucleus of the cell. The mRNA then travels out of the nucleus to the cytoplasm where translation occurs. During translation, the mRNA is read by a ribosome, and tRNA (transfer RNA) brings the appropriate amino acids to create a polypeptide chain, which will fold into a functional protein.
Transcription - DNA is transcribed to produce mRNA.Traveling of mRNA out of the nucleus - After being processed, the mRNA molecule exits the nucleus.tRNA binding to mRNA - Occurs during translation as tRNA molecules bring amino acids to build the polypeptide chain based on the sequence of the mRNA.Folding of the polypeptide - The polypeptide folds into its final protein structure.The differences between a sequence of DNA and the sequence of mature mRNA include the removal of introns (non-coding regions) from the pre-mRNA during RNA processing, resulting in only exons (coding regions) being included in the mature mRNA. Additionally, a 5' cap and a poly-A tail are added to the mRNA for stability and regulation of translation.
Complementary DNA (cDNA) created by reverse transcribing mRNA can be particularly useful for understanding an organism's proteins because it represents only the expressed genes and skipping non-coding regions, allowing for a simpler analysis of the coding potential of a genome.
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A biologist is writing a report about a group of rattlesnakes that all live in the state of Florida. All rattlesnakes in this group can breed with one another and produce offspring that can reproduce together. The report includes statistics about the number of these rattlesnakes, their breeding rate, and the ranges of their sizes and other traits. In this report, the biologist is describing?
A.a community in Florida.
B.a biome in Florida.
C.a population in Florida.
D.an organism in Florida.
Answer: C. a population in Florida
As a biologists is writing about a report on group of rattlesnakes that all lived in the state of Florida. It is mentioning about the species of a particular snake but a group of organisms considering a group or organisms which breed with one another and produce offsprings that can reproduce together. All these features can be defined under a single term called as population. Members of species that are be breed with each other and can produce viable fertile offsprings is called as population. Therefore, in this report biologist is describing about population in Florida.
Answer:
The correct answer is option C, a population in Florida
Explanation:
The population description is an efficient language is termed as demographics. The descriptive components of the demographics are –
a) Population Size – It gives the number of individuals within a population
b) Population Density – It defines the size of a population with respect to the space occupied by it
c) Age Structure of the Population – It categorizes different individuals in a population group to different age sections
d) Fecundity – It describes about an individual that is able to produce during a given period of time
e) Morality – It gives the death and birth rate of a population
f) Sex ratio
How do cells in animals get energy??
Answer: animals cell get energy by..
Animals obtain energy by eating plants. The only form of energy a cell can use is a molecule called adenosine triphosphate (ATP). Chemical energy is stored in the bonds that hold the molecule together. ADP can be recycled into ATP when more energy becomes available.
Explanation:
The cells of animals considerably rely on the process of cellular respiration in order to get energy.
What is Cellular respiration?Cellular respiration may be defined as a process through which cells of living organisms produce energy with the help of the breakdown of food molecules into simpler substances.
Cellular respiration, also known as aerobic respiration significantly involves the sequence of chemical reactions which initiate with the reactants like sugar (glucose) in the presence of oxygen in order to produce carbon dioxide, water, and energy. Here, the energy that is synthesized must be in the form of ATP.
Cellular respiration is again split into a variety of reactions like glycolysis, the Citric-acid cycle, oxidative phosphorylation, etc. But the ultimate aim of all remains the same which is the production of energy.
Therefore, the cells of animals considerably rely on the process of cellular respiration in order to get energy.
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An example of skeletal muscle is?
a.the heart
b.the lungs.
c.the leg
d.the stomach
Answer: The correct answer is -
c. the leg.
Skeletal muscle is one of three major categories of muscle tissues (other two being smooth muscle and cardiac muscle.
This is striated muscle tissue, which is voluntary in nature (therefore also termed as voluntary muscle) and lies under the somatic nervous system.
Majority of skeletal muscles are connected to bones with the help of tendons (which are bundles of collagen).
Skeletal muscles provide support to the body and assist in movement. This is because contraction of skeletal muscle allows pulling of tendons, which are basically attached to bone. This assist in movement of legs (such as walking, jumping).
This indicates that every physical activity performed by an organsim is related to skeletal muscle.
Thus, muscles associated with legs are example of skeletal muscles.
Therefore, option c) is the right answer.