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- Question
Heritable variation is required for which of the following?
Options- A. Evolution
- B. Asexual reproduction
- C. Mitosis
- D. Meiosis
- Correct Answer
- Evolution
ExplanationHeritable variation is one of the four most important factors that affect whether natural selection can occur. These factors include
1) Heritable variation
2) Descent with modification
3) Struggle for survival, and necessarily if the others are satisfied
4) Survival of the fittest.
Heritable variation allows for possibly beneficial, negative, or even neutral mutations to get filtered during each generation by natural selection--weeding out negative mutations, passing on positive and neutral ones. Without heritable variation, species would quickly fall victim to parasites who take advantage of identical genetic material in a population and evolution would not occur.
Variation is the raw material of evolution.
- 1. Which of the following is not correct concerning nerves?
Options- A. Axons make up a majority of the matter in a nerve.
- B. Nerves are collection of axons of either sensory or motor neurons but not both.
- C. Nerves are covered by an outer sheath called the epineurium
- D. Nerves consist of parallel bundles of myelinated and nonmyelinated axons. Discuss
- 2. Which of the following statements about ddntps is true?
Options- A. They have a hydrogen at the 3? carbon of the sugar.
- B. DNA polymerase can add a new dNTP to a 3? ddNTP.
- C. They have a free 3?-hydroxyl group on the ribose sugar.
- D. They have an oxygen at the 2? carbon of the ribose sugar. Discuss
- 3. Which of the following vitamin helps in clotting of blood?
Options- A. Vitamin K
- B. Vitamin D
- C. Vitamin B1
- D. Vitamin B2 Discuss
- 4. Why are yeast cells frequently used as hosts for cloning?
Options- A. they are eukaryotic cells
- B. they do not have plasmids
- C. only yeast cells allow the gene to be cloned
- D. they easily form colonies Discuss
- 5. A pulse can be detected most easily in
Options- A. a vein
- B. a lacteal
- C. an artery
- D. a capillary Discuss
- 6. Which of these is unique to flowering plants?
Options- A. double fertilization
- B. an embryo surrounded by nutritive tissue
- C. haploid gametophytes
- D. pollen production Discuss
- 7. Which of the following are involved directly in pulmonary circulation?
Options- A. left ventricle, aorta, and inferior vena cava
- B. right atrium, aorta, and left ventricle
- C. superior vena cava, right atrium, and left ventricle
- D. right ventricle, pulmonary artery, and left atrium Discuss
- 8. Which is not a function of the cytoskeleton?
Options- A. helps the cell move
- B. gives cell a shape
- C. prevents chromosomes from separating
- D. None of the above Discuss
- 9. To what kingdom do common bacteria belong
Options- A. Archaea
- B. Protista
- C. Eubacteria
- D. All the above Discuss
- 10. Is yeast a fungus or bacteria? Discuss
Biology problems
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Correct Answer: Axons make up a majority of the matter in a nerve.
Explanation:
Axons make up a majority of the matter in a nerve is the one statement regarding nerves is incorrect.
Correct Answer: They have a hydrogen at the 3? carbon of the sugar.
Explanation:
ddNTPs - Dideoxynucleotides and abbreviated as ddNTPs.
They are chain-elongating inhibitors of DNA polymerase, used in the Sanger method for DNA sequencing.
They have a hydrogen at the 3? carbon of the ribose sugar.
Correct Answer: Vitamin K
Explanation:
Vitamin K helps in clotting of blood. It is used by the body to help blood clot.
Warfarin (Coumadin) is used to slow blood clotting. By helping the blood clot, vitamin K might decrease the effectiveness of warfarin (Coumadin).
Correct Answer: they are eukaryotic cells
Explanation:
If you were to produce a protein in bacterial cloning systems, you would not get the same post transcriptional and post translational modifications because the prokaryotic and eukaryotic systems work differently on the modifications.
Thus human recombinant protein genes are usually cloned in yeast cells. Also since they have a short generation time, they can be easily culture.
Correct Answer: an artery
Explanation:
A pulse can be detected most easily in Arteries as they are under much greater pressure than veins because they are carrying blood away from the heart which is the pumping machine to force blood to move to all of the body.
Every time the hear contracts, it can be felt in an artery where a surge of blood has just been forced.
A capillary is too small to feel a pulse and a lacteal is part of the lymphatic system found in the small intestine.
Correct Answer: double fertilization
Explanation:
In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.
Hence, double fertilization is unique to flowering plants.
Correct Answer: right ventricle, pulmonary artery, and left atrium
Explanation:
Right ventricle (which pumps blood to the lungs), pulmonary artery (which carries blood to the lungs), and left atrium (which receives blood from the lungs) are involved directly in pulmonary circulation.
Correct Answer: prevents chromosomes from separating
Explanation:
A cytoskeleton acts as a frame that gives a cell its shape, protects it to an extent, and helps with cellular motion.
Correct Answer: Eubacteria
Explanation:
There are two kingdoms of bacteria. They are
1. Eubacteria and
2. Archaea
The members of these two kingdoms appear similar in shape and appearance, even under the extreme magnification of the electron microscope . However, they are very different from each other in a number of molecular and biochemical aspects. It is these differences that have resulted in the microorganisms being grouped into separate kingdoms.
For example, eubacteria contain the rigid, stress-bearing network known as the peptidoglycan . The only exceptions are the bacteria from the genera Mycoplasma and Chlamydia. Archaebacteria do not contain peptidoglycan. Instead, they contain a different structure that is called pseudomurein.
The common bacteria belongs to Eubacteria kingdom.
Correct Answer: Yeast belongs to members of the Kingdom Fungi Yeast are single-celled microorganisms that are classified, along with molds and mushrooms in Fungi family Yeasts are evolutionally diverse and are therefore classified into two separate phyla, Ascomycota or sac fungi and Basidiomycota or higher fungi, that together form the subkingdom Dikarya
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