Biology problems
- 1. Which statement is one component of the cell theory?
Options- A. DNA is the basis of genetic transfer
- B. All living cells arise from pre-existing cells
- C. All cells are composed of same organelles
- D. Tissues are formed from combinations of cells Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: All living cells arise from pre-existing cells
Explanation:
All living cells arise from pre-existing cells is one component of the cell theory.
The Cell Theory is one of the basic principles of biology.
The Cell Theory states:
1. All living organisms are composed of cells. They may be unicellular or multicellular.
2. The cell is the basic unit of life.
3. Cells arise from pre-existing cells.
- 2. Which of the following is an example of polygenic inheritance?
Options- A. Skin pigmentation in humans
- B. Huntington?s disease in humans
- C. White and purple flower color in peas
- D. The ABO blood groups in humans Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Skin pigmentation in humans
Explanation:
Polygenic inheritance involves the determination of a particular phenotypic characteristic by many genes, called polygenes(group of genes influencing a quantitative characteristic), each having a small effect individually.
Height and skin colour in humans are examples of Polygenic characters.
- 3. A pulse can be detected most easily in
Options- A. a vein
- B. a lacteal
- C. an artery
- D. a capillary Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
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.
- 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 Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
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.
- 5. Which of the following vitamin helps in clotting of blood?
Options- A. Vitamin K
- B. Vitamin D
- C. Vitamin B1
- D. Vitamin B2 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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).
- 6. 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. Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
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.
- 7. 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. Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
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.
- 8. Heritable variation is required for which of the following?
Options- A. Evolution
- B. Asexual reproduction
- C. Mitosis
- D. Meiosis Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Evolution
Explanation:
Heritable 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.
- 9. 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 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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.
- 10. 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 Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
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.
More in General Knowledge:
Programming
Copyright ©CuriousTab. All rights reserved.