Answer:
Option B, 1000 X
Explanation:
The simple formula to find the magnification strength of compound light microscope is to multiply the magnification power of eyepiece lens by the objective lens power.
For example – if an eyepiece has power of10x and objective lens has power of 20x , then the highest magnification could be 10 X 20 i.e 200
However, the maximum magnification power of a lens is 1000x
Thus, option B is correct
How might you alter a trna so that it inserts an alanine into a polypeptide for which a lysine is coded?
Discuss the term "survival of the fittest" was developed and what it means.
Survival of the fittest is a word coined best known by British naturalist Charles Darwin in the fifth edition of On the Origin of Species, which proposed that organisms that are best adapted to their environment are the most successful in surviving and reproducing.
What is evolution?Change in the heritable traits of biological populations over successive generations is referred to as evolution. These traits are gene expressions that are passed down from parent to offspring during reproduction.
The phrase "survival of the fittest" refers to the process of natural selection, a mechanism that drives evolutionary change.
Natural selection works by favoring individuals who are better adapted to a given set of environmental conditions over those who are not.
In this context, evolution is both a fact and a theory. It is an undeniable fact that organisms have changed, or evolved, over the course of Earth's history.
Thus, it can be concluded that the term survival of the fittest was coined in fifth edition of On the Origin of Species.
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7. A system of stars orbiting a common center of gravity
A) solar system
B) universe
C) galaxy
D) biosphere
8. The group of eight planets and other matter that orbits the sun.
A) solar system
B) universe
C) galaxy
D) biosphere
9. Everything in outer space including stars,planets, and galaxies
A) solar system
B) universe
C) galaxy
D) biosphere
10. A planet that sustains life in its biosphere
A) mars
B) Venus
C) earth
D) Jupiter
What is the role of restriction enzymes in studying the human genome?
Answer:
Restriction enzymes cut the large DNA of human cells into smaller fragments at specific regions called as restriction sites.
Explanation:
Restriction enzymes are endonucleases that cut the DNA into smaller fragments. These DNA fragments are separated from each other through gel electrophoresis and used to make the DNA profiles of individuals. Thus, restriction enzymes help in study of human genome by carrying out site specific digestion of human DNA.
) in an atom, the nucleus is composed of _____________ and _____________, while the ____________ orbit very quickly around the nucleus.
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Permafrost remains throughout the summer because it is insulated by _____.
groundcover vegetation
thick sheets of ice
snow
topsoil
If I am correct, permafrost may last through the summer because of groundcover vegetation
Answer: groundcover vegetation
Explanation:
what are the two most abundant gases in the atmosphere
Answer:
The correct answer will be- Oxygen (21%) and Nitrogen (78%)
Explanation:
The atmosphere of Earth is composed of a mixture of the gases in different concentrations.
The major constituent gases of the atmosphere are the nitrogen which constitutes about 78% of the total gases present and the oxygen which constitutes the 21% of the total gases.
These gases exist in their divalent states in the atmosphere where the nitrogen is used by the organisms when it is fixed by the prokaryotic nitrogen-fixing bacteria whereas the oxygen is directly used by the organism.
Thus, Oxygen (21%) and Nitrogen (78%) is the correct answer.
Which of the following plants do NOT have swimming sperm?
ginkgos
cycads
both a and b
none of the above
Answer:
None of these.
Explanation: The plants like cycads and ginkgos have swimming sperms. they need water to complete their life cycle.
There are many adaptations seen in the plants like liveworts, ferns and mosses in which they require water to complete its life cycle. This adaptation is not only restricted upto cyptograms. This can also be seen in the plants like ginkgos and cycads. Their sperms are very strange.
A garden has 80 pea plants. Of this total, 20 plants have short stems and 60 plants have tall stems. What percentage of the plants is short?
which molecule forms the bulk of a cell membrane?
which is the best definition of diffusion?
which substance is commonly found in a cell membrane?
what is the process whereby molecules in vesicles are exported out of a cell?
In a eukaryotic cell, where is most of the DNA located?
1. which molecule forms the bulk of a cell membrane?
answer: phospholipid
In terms of structure, a cell membrane (or plasma membrane)
consists mainly of a phospholipid bilayer (with associated proteins embedded in
it).
2. which is the best definition of diffusion?
answer: Diffusion is the bulk movement of particles from a region of higher concentration to a region of lower concentration
3. which substance is commonly found in a cell membrane?
answer: proteins
Proteins are enzymes which help transport things through the
membrane.
4. what is the process whereby molecules in vesicles are exported out of a cell?
answer: exocytosis
Actually there are 2 types of bulk transport and these are: exocytosis and endocytosis, and both require the spending of energy (ATP). In exocytosis, resources are excreted out of the cell via secretory vesicles.
5. In a eukaryotic cell, where is most of the DNA located?
answer: inside the nucleus
The nucleus is the main center of our cells. This contains our chromosomes and genetic information essential for the reproduction of life.
During periods of intense activity, your body releases an antidiuretic hormone called vasopressin that causes the body to retain water (by decreasing the amount of water that is expelled in urine). why does this make endurance athletes particularly vulnerable to developing hyponatremia?
Final answer:
Endurance athletes are vulnerable to developing hyponatremia due to the release of antidiuretic hormone (ADH) which conserves water and decreases urine output, thereby diluting blood sodium levels without adequate sodium replacement.
Explanation:
During periods of intense activity, such as those experienced by endurance athletes, the body releases antidiuretic hormone (ADH) or vasopressin, which is secreted by the hypothalamus. This hormone plays a crucial role in conserving body water by causing the kidneys to excrete less water in urine, thereby conserving water when dehydration is a risk.
However, this mechanism makes endurance athletes particularly vulnerable to developing hyponatremia, a condition characterized by low sodium levels in the blood. This is because as water retention increases without adequate sodium intake to balance the increased fluid volume, the concentration of sodium in the blood drops. During long-duration activities, athletes often consume large volumes of water to stay hydrated but may not adequately replace lost sodium, exacerbating this imbalance.
Therefore, while ADH aids in water conservation, its effect on reducing urine output without compensatory sodium intake can lower blood sodium levels, leading to hyponatremia, which is particularly risky for endurance athletes engaged in prolonged physical activity.
Compare and contrast the lowry and bradford protein assays with regard to compatibility with various potential contaminating compounds.
You have examined several body systems that rely and work with each other in order function properly. One very important task that amphibians and all living things need is to efficiently exchange gases in order to survive. Explain in a brief essay how the cardiovascular system and respiratory system work with each other based on your experience and observations from this virtual lab.
A common way by which virus vaccines are made is to introduce a mutation that makes the virus less virulent (i.e. that reduces the severity of infection) and to expose patients to that mutated virus. which sort of mutation would it be safest to introduce to ensure that the virus cannot easily revert to its original, virulent state?
Complete the description of experimental evidence that would be consistent with these conclusions. drag the terms on the left to the appropriate blanks on the right to complete the sentences. terms can be used once, more than once, or not at all.
Which is not a use for fossils found in sedimentary rock
Determining the mineral composition of the rocks
one hypothesized mechanism by which antidepressant medications help to regulate mood is the suppression of ______ sleep.
What would happen to the proton gradient and atp production after a drug has poisoned the enzyme that combines acetyl coa and oxaloacetate to form citrate? see section 9.5 ( page 201) ?
The movement of the arms and legs is accomplished by the _____ subdivision of the peripheral nervous system.
The somatic subdivision of the peripheral nervous system controls voluntary movements like walking or moving arms.
The movement of the arms and legs is accomplished by the somatic subdivision of the peripheral nervous system.
The somatic nervous system is responsible for controlling voluntary activities, such as walking or moving your arms. It allows individuals to have direct control over skeletal muscles, enabling purposeful movement.
For many species living in variable environments, sexual reproduction has proven to be a better solution for reproduction than asexual reproduction because sexual reproduction ______________ .
how do organisms get the energy they need?
A. Plants get energy from fertilizers, and animals get energy by drinking water.
B. Plants get energy from glucose produced in the soil, and animals get energy directly from sunlight.
C. Plants do not require energy because they do not move, and animals get energy by performing exercise.
D. Plants break down the glucose they produced in photosynthesis, and animals get energy from eating other organisms.
In this Energy Acquisition question, Plants create energy by photosynthesizing sunlight into glucose, which they then break down for use. Animals get energy from eating other organisms, breaking down the food in their body to release the energy stored in it. Correct option is option D.
Organisms get the energy they need in different ways. Plants, being autotrophs, capture energy from the sun through photosynthesis to convert carbon dioxide and water into glucose, a type of sugar, which they break down to release energy as needed.
This process involves converting light energy into chemical energy stored in glucose.
On the other hand, animals, being heterotrophs, get their energy directly from eating other organisms, whether they are plants, animals, or both.
The food they consume is broken down through the process of digestion, and the nutrients, especially glucose, are used in cellular respiration to release energy essential for the various activities and functions of the body.
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N the laboratory, you set up an experimental mating between a male and female fruit fly that are both heterozygous (aa) at a locus where the homozygous recessive genotype (aa) is lethal at the early embryo stage. in a large sample of 100 surviving offspring, how many do you expect to have the homozygous dominant (aa) genotype?
In every energy transformation some energy is always "lost" __________ energy.
a.radiant
b.electrical
c.chemical
d.thermal
There is a loss of thermal energy during the process of energy transformation. Therefore, option "D" is correct.
What is thermal energy?The energy of the system which is controlled by its temperature is referred to as thermal energy. The term used for the flow of thermal energy is referred heat. The first law of thermodynamics explains how heat and work are transferred between systems, which is the subject of a whole branch of physics called thermodynamics.
There are different ways of energy transfer convection, conduction, and radiation. Thermal energy can be seen in the process of boiling water on a stove. These radiation transfer when come in contact.
Therefore, every material radiates energy which is transferred from one body to another.
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__________ is the conversion of acetyl coa into ketone bodies.
Final answer:
Ketogenesis is the conversion of surplus acetyl CoA into ketone bodies, such as acetoacetate, β-hydroxybutyrate, and acetone, when the Krebs cycle is overwhelmed. This process provides an alternative energy source for the body during periods of low glucose availability.
Explanation:
Ketogenesis is the conversion of acetyl CoA into ketone bodies. When there is an excess of acetyl CoA from the oxidation of fatty acids, and the Krebs cycle (citric acid cycle) cannot process it all, the liver converts this surplus acetyl CoA into ketone bodies through a pathway known as ketogenesis. The main ketone bodies produced are acetoacetate, β-hydroxybutyrate (B-hydroxybutyrate), and acetone. The process starts with two acetyl CoA molecules combining to form acetoacetyl-CoA. This is then converted into β-hydroxy-β-methylglutaryl-CoA (HMG CoA), which subsequently gets cleaved to form acetoacetate and acetyl CoA. Most of the acetoacetate is further reduced to β-hydroxybutyrate, and a smaller portion decarboxylates to form acetone and carbon dioxide.
Ketone bodies are useful as an alternative energy source when glucose is scarce, such as during prolonged fasting or uncontrolled diabetes. They can be transported from the liver to other tissues, where they are reconverted to acetyl CoA and enter the Krebs cycle to produce energy. This ensures organs like the brain can function even when glucose supply is low.
When salt is mixed with water and stirred, the salt will dissolve, forming a solution. When sand is mixed with water, the sand will not dissolve. Why will salt form a solution with water but sand will not?
A) Salt is pulled apart into two ions by the polar water molecules, and sand is not.
B) Sand forms complex crystals which dissolve much more slowly than non-crystalline salt.
C) Salt consists of only 2 atoms and is small enough to dissolve, while sand is too large.
D) Sand is much harder than salt and so it will not form a solution with water.
The correct answer is A) Salt is pulled apart into two ions by the polar water molecules, and sand is not.
This happens because salt has both positive and negative ends that are attracted by the polar molecules of water.
What were some of the earliest forms of life on Earth?
Answer:
The first life forms were (3.8 to 2.5 billion years ago), the Archean Period and the world's landmasses began to form in the Archean Period. Earth's initial life forms were bacteria, which could survive in the highly toxic atmosphere that existed during this time.
Explanation:
Right on ED2021 practice, goodluck!
Microbes, the earliest known life forms, left traces of their existence in rocks that were 3.7 billion years old.
What are microbes?Microbes are extremely minute living entities that are all around us and are invisible to the unaided eye.
They are aquatic, terrestrial, and avian organisms. Millions of these bacteria, which are also referred to as microorganisms, reside in the human body. While certain microorganisms make us ill, others are vital to our wellbeing.
A microorganism, often known as a microbe, is technically a tiny organism. The term "microbiology" refers to the study of microorganisms.
Bacteria, fungus, archaea, and protists are all types of microorganisms. Prions and viruses are not considered microbes because they are considered non-living in general.
The earliest known life forms, microbes, left behind signs of their presence in 3.7 billion year-old rocks.
Thus, microbes are some of the earliest forms of life on Earth.
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History: When did stem cell research become known? Who discovered stem cells? What experiments or studies have been conducted so far?
Answer:
The stem cells was discovered by Ernest McCulloch and James Till in 1981. Studies conducted for stem cells can be used for bone marrow transplantation and to treat various diseases.
Explanation:
Stem cell are the cells that has the ability to differentiate into different cells of the body. In 1978 human cord blood discovered as stem cell. The stem cell research come to known in 1981.
Ernest McCulloch and James Till discovered the stem cell research while working on the mice bone marrow. He found that the different blood cells were formed by the single class of cells.
Experiments on mice and other animals have been conducted to study the stem cells so far. The study of stem cell is useful to cure the genetic defects, Cancer and other harmful diseases.
In 1963 James Edgar Till discovered that bone marrow transplanted cells in the spleen of mice self-replicated. With the research, Canadian scientist James Edgar Till discovered stem cells that have become a known and controversial subject ever since.
From this, stem cells have become the subject of numerous studies and experiments, and are the main subject of many debates. Experiments have already been performed that tested the influence of stem cells in cancer treatments, cloning, chronic disease treatments, experiments that evaluate the possibility of organ transplantation from animals to humans, tumor treatment, among others.
Several segments of the population have taken a position contrary to this type of research, as they claim that the good of society cannot be obtained from the death of some individuals, even if still in the embryonic stage. The Roman Catholic Church, as well as Protestant churches has defended this position, also accepted by many unrelated scientists and philosophers, that a person's life begins with fertilization, so there is no ethically adequate justification for such research. .
Skin cells perform very different functions compared to brain cells. on the molecular level, what makes skin cells different from brain cells in the same organism? ph atp dna proteins
Why is it incorrect to say that astronauts are weightless in space while orbiting Earth in a space shuttle?
In space, humans and their spaceship are still affected by Earth's gravity. Even though Earth's gravity is weaker in orbit, they still retain weight. They don't feel their weight since nobody pushes back.
What is weightlessness?Even though they are outside of Earth's gravitational pull, astronauts and their spacecraft continue to have mass and are subject to its effects. In this sense, they continue to have weight, despite the fact that the gravitational pull of the Earth is weaker in orbit than it is on the surface of the Earth. However, they are not aware of their own weight because there is no resistance being exerted on them.
The sense of having no weight at all, or almost none at all, is what is referred to as weightlessness. This phenomenon is often referred to as zero G-force or simply zero-G. A thing's weight can be thought of as a measurement of the force that gravity exerts on it while it's just sitting there doing nothing.
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The first stage of catabolic metabolism occurs in the
A. gallbladder.
B. stomach.
C. pancreas.
D. liver.