The world’s deepest lake is Lake Baikal in Russia. And you’ll find there the Baikal seal, Lake Baikal seal or nerpa. It is a type of earless seal widespread to Lake Baikal in Siberia, Russia and the only mammal there. Like the Caspian seal, it is interrelated to the Arctic ringed seal. The Baikal seal is one of the smallest true seals and the only completely freshwater pinniped species. It remains a scientific ambiguity of how the seals initially came to Lake Baikal, hundreds of kilometers from any ocean.
Which is a point mutation?
Which is the BEST research question for students to ask if they are conducting research on antibodies?
How does the immune system produce memory cells for antigens?
This is the BEST research question for students to ask if they are conducting research on antibodies because the answer to this question must tell about production of B-cells, recognition of antigen, T-helper cells, colony formation, and phagocytosis of foreign antigen, T-killer cells, and all other details which is possible.
Why are leaves green?
a. chlorophyll molecules mainly absorb light in the ultraviolet and red-orange part of the electromagnetic spectrum. chlorophyll does not absorb much green light, which is reflected to our eyes.
b. chlorophyll molecules mainly absorb light in the blue-violet and red-orange part of the electromagnetic spectrum. chlorophyll does not absorb much green light, which is reflected to our eyes.
c. chlorophyll molecules mainly absorb light in the ultraviolet and infrared part of the electromagnetic spectrum. chlorophyll does not absorb much green light, which is reflected to our eyes.
d. chlorophyll molecules mainly absorb light in the blue-violet and infrared part of the electromagnetic spectrum. chlorophyll does not absorb much green light, which is reflected to our eyes.
e. chlorophyll molecules mainly absorb light in the green part of the electromagnetic spectrum?
Final answer:
Leaves are green because chlorophyll pigments absorb blue-violet and red-orange light but reflect green light. The reflected green light is what we see, which is why plants appear green. Chlorophyll's low absorption in the green spectrum paired with the absorption properties of accessory pigments like carotenoids enables the range of light plants use for photosynthesis. Option B is correct.
Explanation:
The color of leaves is a result of the presence of chlorophyll pigments which absorb light. Leaves appear green because chlorophyll molecules mainly absorb light in the blue-violet and red-orange part of the electromagnetic spectrum (wavelengths in the range of 430-660 nm for chlorophyll A and 450-640 nm for chlorophyll B). These molecules do not absorb much green light, which is reflected to our eyes. Consequently, this reflected green light is what gives plants their characteristic green color.
When it comes to the specifics of why leaves do not absorb green light, it comes down to the absorption spectrum of the chlorophyll molecules. The chlorophyll has high absorbance for blue and red wavelengths and low absorbance for green wavelengths. Plants also have other pigments like carotenoids which absorb in the blue-green to violet range and reflect yellow, red, and orange wavelengths. These accessory pigments help plants absorb a wider spectrum of light for photosynthesis.
Which of the following actions would be most effective in decreasing the amount of carbon dioxide in the atmosphere while increasing the amount of biodiversity in an area?
Answer:
Planting more trees to absorb more of the carbon dioxide from the atmosphere
Synthetic estrogen-like compounds have been found in the marine environment. The synthetic compounds "mimic" the biological activity of the important vertebrate sex hormone estrogen. How is this pollutant best classified and why? What caused this to be a public health concern?
The synthetic estrogen-like compounds found in the marine environment are best classified as endocrine disruptors.
Endocrine disruptors are chemicals that can interfere with the endocrine (hormone) systems of organisms. These synthetic compounds mimic the biological activity of natural hormones, such as estrogen, by binding to hormone receptors, which can lead to a range of adverse developmental, reproductive, neurological, and immune effects in both wildlife and humans.
Widespread presence: These pollutants are found in various water bodies due to wastewater discharge and agricultural runoff.
Impact on aquatic life: They can affect fish reproduction, development, and behavior.
Potential human health risks: Humans can be exposed through contaminated seafood consumption or water sources. Potential effects include hormonal imbalances, developmental problems, and certain cancers.
The concern is that these pollutants can disrupt the hormonal balance in both aquatic organisms and potentially humans, leading to various health issues.
The krebs cycle, named after its discoverer is also called ____ cycle after the molecule that forms once acetyl enters the cycle.
cytosol enters the cycles
A client in preterm labor is to receive a tocolytic medication, and bedrest is prescribed. which position should the nurse suggest that the client maintain while on bedrest?
In seedcracker finches from cameroon, small- and large-billed birds specialize in cracking soft and hard seeds, respectively. if long-term climatic change resulted in all seeds becoming hard, what type of selection would then operate on the finch population?
When solids and fluids return to the mouth from the stomach, the condition is known as:?
Solids and fluids return to the mouth from the stomach, the condition is known as, known as "gastroesophageal reflux" or "gastroesophageal reflux disease" (GERD).
It occurs when stomach contents, including both solids and fluids, flow back into the esophagus and sometimes even into the mouth due to a malfunction of the lower esophageal sphincter (the muscular ring between the esophagus and stomach) or other factors. This can lead to symptoms such as heartburn, regurgitation, and a sour or bitter taste in the mouth.
It happens when the lower esophageal sphincter (LES) doesn't close properly, allowing stomach contents to flow back into the esophagus and potentially even into the mouth.
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What are the characteristics of life in lithops are succulent plants?
Which of the following is not a result of air pollution
Why does the treatment of a genetic disease produce only a "phenotypic cure"?
Final answer:
Treatments like gene therapy for genetic diseases such as SCID address the symptoms (phenotype) but often do not change the underlying genetic makeup (genotype). These treatments provide a 'phenotypic cure' by improving the observable characteristics or symptoms, while the genetic mutations are still present in the individual's DNA and can be inherited.
Explanation:
When addressing genetic diseases like Severe Combined Immunodeficiency (SCID), treatments often focus on alleviating or correcting the phenotypic symptoms rather than changing the underlying genetic cause. This is due to the complexity of genetic disorders, which are caused by abnormalities within the genome impacting the normal function of proteins and cells. Current treatments, such as gene therapy, have the potential to insert normal genes into cells that harbor mutations, and while this can mitigate the symptoms or phenotype, it does not alter the patient's germ line and therefore is not a true genetic cure.
This phenomenon is described as a 'phenotypic cure' because the treatments can improve the phenotype—observable characteristics or symptoms of the disease—even though the genotype—individual's genetic makeup—remains unchanged. For single-gene disorders, where a defect in one specific gene can give rise to the disease, gene therapy holds promise. However, for most diseases influenced by multiple genes and environmental factors, predicting inheritance patterns, and addressing genetic disorders, becomes considerably more complex.
Treatments that target symptoms can be effective in improving quality of life and health outcomes. Nonetheless, they do not offer a permanent solution as the individual's DNA, which can be passed to the offspring if the gene is not in the germ line, contains the original mutation. Therefore, until treatments that can safely and effectively alter the germ line are developed and ethically approved, genetic diseases will generally only be treatable at the phenotypic level.
Organisms and their nonliving environment are connected.
True
False
Suppose a segment of mitochondrial DNA (mtDNA) is compared between two similar modern-day species. It is known that this segment of mtDNA changes at a steady rate of one base pair every 4 million years. Compare the sequences of the two mtDNA segments given below.
Species A: GCACTAAGCATCGATTT
Species B: GCACCAGGCACTGGTTC
Use this base principle of molecular clocks to calculate how long ago the two species diverged from a common ancestor.
A) 12 million years ago
B) 8 million years ago
C) 48 million years ago
D) 24 million years ago
Answer: 12 Million Years Ago
Explanation:
1. Base pair mutations × million years = years of evolution
2. Million total years of evolution ÷ # of species (or lineages) = million years of evolution from a common ancestor
1. 6 base pair mutations x 4 million years = 24 million years of evolution
2. 24 million total years of evolution ÷ 2 species = 12 million years of evolution from a common ancestor
24 million years long ago mitochondrial DNA (mtDNA) of species A having segment GCACTAAGCATCGATTT and that of species B having segment GCACCAGGCACTGGTTC diverged from a common ancestor.
What do you mean by mitochondrial DNA (mtDNA)?"Mitochondrial DNA is the circular chromosome found inside the cellular organelles called mitochondria."Functions of mitochondrial DNA include- regulation of cellular metabolism and apoptosis(cell death).The mutation in mtDNA is high.What do you mean by diverged?"The situation in which two things become different."The two samples of species are-
Species A - GCACTAAGCATCGATTT
Species B - GCACCAGGCACTGGTTC
There are 6 base pair changes in mitochondrial DNA of both species.
As we know that change in 1 base pair takes = 4 million years
So, the change in 6 base pair takes = 4 x 6 million years
= 24 million years.
Hence, option D. 24 million years ago is correct.
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A genus is subdivided into smaller groups called _____.
classes
species
phyla
genera
A genus is subdivided into smaller groups called species. Therefore, option (B) is correct.
What is taxonomical classification?Taxonomy is the study and practice of categorizing or classifying. A taxonomy (or taxonomical classification) is a categorization scheme, especially a hierarchical classification, that organizes things into groups or kinds.
There are seven primary taxonomic ranks: kingdom, phylum, class, order, family, genus, and species. In addition, domain, which was proposed by Carl Woese, is now commonly used as a fundamental rank, although not being listed in any of the nomenclature laws, and is synonymous with dominion.
A genus is a taxonomic rank composed of species grouped based on shared features (having similar structures or dissimilar characteristics) or evolutionary relationship. It is one of the eight major taxonomic ranks used to classify living organisms. It is subordinate to the family and superior to the species.
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The key function of bile is to emulsify the dietary fats. this prevents the fats from forming large globs which are not easily accessible by the enzymes.
According to
e. o. wilson, ________ refers to genetic variants among a single species, individuals within a species, communities of organisms, and ecosystems.
The answer to this question is biodiversity. Biodiversity is the variants in organisms, animals, and plants simplified as variation of life in all levels in the ecosystem. Mr. Edward Osborne Wilson is known as the father of biodiversity. Biodiversity is important because it makes the ecology stable and give economic benefits to people.
Bolide is a large piece os space debris that crashes into a planet
Answer:
The above statement is true
Explanation:
Bolides are the pieces of space debris that are commonly considered as the fireballs. They are very bright and similar to the moon and can cause craters due to impact, but they are rarely found. These bolides usually shatter when they enter a planet's atmosphere. The composition of bolide is still unknown, whether it is an asteroid comprised of only rocks or is a metallic asteroid, but it has the capacity to form big craters due to an impact.
These are comparatively smaller asteroids. Every year about 5,000 bolides fall on earth but are not visible because during the day time it is not so visible due to the sunlight.
Water-soluble respiratory irritants affect what part of respiratory system first
The division of the nervous system that connects the brain and spinal cord to the rest of the body is the __________ system.
earth is considered a system because all of its parts ___
The given blank can be filled with interact.
Earth is considered as a dynamic system, that is, a combination of interdependent, interrelated, or associating components creating an entity or a collective whole. On a macro level, the system of the Earth sustains its functions and existence as a whole via the associations or interactions of its components or parts.
At a micro or lower level, it is beneficial to consider of the Earth system in terms of four central constituents known as the subsystem, that is, the geosphere, hydrosphere, biosphere, and atmosphere.
Earth is considered a system because all of its parts are interrelated and interact
Further explanationEarth consists of various components that are mutually supportive and related to each other
The earth can be said to be a system because each component inside it interacts so that it creates a very large number of collectivities
Components in the earth are incorporated into a Geosphere, namely a layer on the surface or under the surface of the earth that has a direct and indirect influence on the survival of creatures.
inside it
This geosphere consists of
The atmosphere, namely the air layer of the earth such as the troposphere and stratosphere,Biosphere which is a layer of earth consisting of land, water, and air,The hydrosphere is a layer of water like a river, a glacierAnthroposphere as a place of lifeThe lithosphere, which is the skin of the earth formed by, among others, sedimentary rocksThe existence of these components and the presence of energy that flows between each other makes the earth interdependent with each other
Treatment of one component in the system will affect other components so that it can create a cycle that continues to occur as in the food cycle (food chain) or water cycle
So the components in the Earth's system are interrelated and interacting
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the biosphere, hydrosphere, geosphere, and atmosphere are interconnected.
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Earth's Spheres Interact
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part of the Earth system
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Keywords: Earth, system, the biosphere, hydrosphere, geosphere, atmosphere
When our bodies extract energy from food and convert it to a form that our cells can use, how much total food energy is lost as heat? A. 75 percent B. Less than 10 percent C. More than 50 percent D. 20 percent
Answer: Option C
Explanation: The food that is eaten is used in ATP production and rest of it is released in the form of heat. The food that is eaten undergoes the process of cellular respiration.
This process of cellular respiration helps in the breakdown of the glucose into ATP. An average cell uses 40% of the energy for conversion into adenosine triphosphate and approximately 60% of the energy is released in the form of heat.
So, more than 50% of the food energy is lost in the form of heat.
list 10 common diseases that can cause a secondary immunodeficiency. Finally, describe some actions that you can take to prevent an immune deficiency
Answer:
(Answers may vary.)
In my research, I found that primary deficiencies are present at birth (congenital). Genetic defects cause these deficiencies. They are rare and occur in infants and children. Secondary immunodeficiencies are caused by environmental factors. Some factors are poor diet and certain medications or diseases. They are more common than primary immunodeficiencies and may develop at any age.
The following common diseases can cause a secondary immunodeficiency:
cancers
HIV infection
hepatitis
burns
diabetes
chronic kidney disease
rheumatoid arthritis
lupus
leukemia
malnutrition
Some actions can prevent an immune deficiency:
Eat a healthy diet with plenty of fruits and vegetables.
Avoid people with infections (such as colds).
Wash your hands frequently.
Obtain adequate sleep (about 8 hours).
Practice safe-sex.
Explanation:
its what the website gave me
Chromosomes only exist inside gametes true or false
The male human has a sperm cell and the female has an egg cell. The cells from the male and female that combine to form a zygote are called gametes. The human sperm and egg cells each contain 23 chromosomes. . A combination of gametes forms a zygote with 46 chromosomes. The type of cell division that produces gametes with half the normal chromosome number is the meiosis. Meiosis is the type of cell division used in sexual reproduction. It will occur in the testes and ovaries.Chromosomes get shuffled when eggs and sperm are made. Though most adult cells contain two sets of chromosomes, sperm and egg cells are different. These special cells have just one chromosome from each pair. Which chromosome they get from each pair is random, making each sperm or egg cell unique. There is also a bit of mixing before the chromosomes are sorted into individual sperm or egg cells. Chromosomes from each pair in a mother or father, respectively, make contact and exchange pieces of DNA, creating hybrid chromosomes.
Most cancer-causing air pollutants are found outdoors.
True or False?
its actually false true is wrong
would glucose and fructose be considered structural isomers or geometric isomers?
The condition in which the allele frequency within a population remains the same is called __________. genetic pool genetic equilibrium genetic drift genetic variation
Which enzyme(s) will produce a dna fragment that contains the entire vgp gene (shown in red) and has “sticky ends”?
HindIII and BamHI are the enzymes that will create a DNA fragment that carries the entire vgp gene (shown in red) and has "sticky ends"
Cloning the vgp gene requires an enzyme that has restriction sites on both sides of that gene but not within the gene. Satisfying that requirement are the two enzymes, namely HindIII and BamHI, while at the same time, creates DNA fragments that contain sticky ends. Sticky ends make it possible for the fragments to combine with the DNA of a cloning vector, such as a plasmid
BamH I, on the other hand is a type II restriction endonuclease, having the capacity for recognizing short sequences (6 b.p.) of DNA and specifically cleaving them at a target site.
If the dorsal root of a reflex arc controlling arm movement is severed, what part of the nerve pathway will block nerve impulse?
What behaviors are observed by the nurse in the client during the latent phase of the first stage of labor? ati?
During the latent phase of labor, the nurse may observe the client experiencing mild contractions, a low backache, emotions of excitement or anxiety, dilatation of the cervix, a bloody show, possible rupture of membranes, and a desire for support.
Explanation:The latent phase is the first phase of the first stage of labor. During this phase, a nurse may observe various behaviors in the client. These can include the client experiencing irregular, but mild contractions starting approximately every 15-20 minutes and progressing to about every 5 minutes. These contractions may be accompanied by a low backache. Emotionally, the client may be excited, anxious or nervous.
The cervix during the latent phase usually dilates from 0 to 3 cm. Some other signs and symptoms may include a bloody show as the cervix begins to change, possible rupture of membranes (water breaking), and the client beginning to seek support due to discomfort associated with contractions.
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