Biology problems
- 1. What are the three main parts of a Eukaryotic cell? Also asked in: Analyst, Bank PO
Correct Answer: Eukaryotic cells are found in plants, animals and unicellular organisms The three main part of Eukaryotic cells are 1 Plasma membrane or membrane-bound organelles which carries out the cell functions 2 Nucleus which contains the cell's DNA (and) 3 Cytoplasm which is a jelly like fluid interior of the cell
- 2. Which of the following does not influence haemoglobin saturation?
Options- A. Nitric oxide
- B. Carbon dioxide
- C. Temperature
- D. DPG Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Nitric oxide
- 3. Myeloid stem cells give rise to all leukocytes.
Options- A. TRUE
- B. FALSE Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: FALSE
Explanation:
Hemopoiesis begins in the red bone marrow, with hemopoietic stem cells that differentiate into myeloid and lymphoid lineages.
Myeloid stem cells give rise to all the other formed elements, including the erythrocytes; megakaryocytes that produce platelets; and a myeloblast lineage that gives rise to monocytes and three forms of granular leukocytes: neutrophils, eosinophils, and basophils.
- 4. When is genetic drift a major factor in evolution?
Options- A. When there is male competition
- B. When there is artificial selection
- C. When there is no selective pressure
- D. When there is disruptiveselection Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: When there is no selective pressure
Explanation:
Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance.
When is genetic drift a major factor in evolution is
* When there is low gene flow.
* When there is no selective pressure.
* When there is a bottleneck.
- 5. Hormones are chemicals secreted and regulated by the endocrine system.
Options- A. TRUE
- B. FALSE Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: TRUE
Explanation:
True. Hormones are chemicals secreted and regulated by the endocrine system.
- 6. Localized area of pus formation in the lungs is
Options- A. Pulmonary embolism
- B. Pulmonary abscess
- C. Pleurisy
- D. Pulmonary edema Also asked in: Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst
Correct Answer: Pulmonary abscess
- 7. The storage form of glucose in animals is
Options- A. Starch
- B. Glucose
- C. Glycogen
- D. None of the above Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Glycogen
Explanation:
Glycogen is the storage form of glucose in animals and humans which is analogous to the starch in plants. Glycogen is synthesized and stored mainly in the liver and the muscles.
- 8. The term aerotolerant anaerobe refers to an organism that
Options- A. uses oxygen or grows without oxygen.
- B. requires more oxygen than is present in air.
- C. does not use oxygen but tolerates it.
- D. requires less oxygen than is present in air. Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: does not use oxygen but tolerates it.
- 9. The NADPH required for the calvin cycle comes from
Options- A. Reactions initiated in photosystem 1
- B. Citric acid cycle
- C. Reactions initiated in photosystem 2
- D. Glycolysis Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
Correct Answer: Reactions initiated in photosystem 2
Explanation:
ATP and NADPH produced by the light reactions are used in the Calvin cycle to reduce carbon dioxide to sugar. The Calvin cycle is similar to the Krebs cycle in that the starting material is regenerated by the end of the cycle.
- 10. Which of the following occurred in the presence of tetrodotoxin?
Options- A. The number of action potentials decreased.
- B. The size of the action potential increased.
- C. The number of action potentials increased.
- D. The size of the action potential decreased. Also asked in: AIEEE
Correct Answer: The number of action potentials decreased.
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