Biology problems
- 1. Which organelles are unique to plant cells?
Options- A. Central vacuole
- B. Chlorophyll
- C. Cell wall
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
- 2. Which of the following is true of enzymes?
Options- A. Enzymes lowers the activation energy for the chemical reaction
- B. Enzymes speed up the rate of a chemical reaction
- C. Both A & B
- D. Neither A nor B Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Both A & B
Explanation:
Enzymes are macromolecular biological catalysts. Enzymes accelerate chemical reactions. The molecules upon which enzymes may act are called substrates and the enzyme converts the substrates into different molecules known as products.
- 3. Which plant cell organelle contains its own dna and ribosomes?
Options- A. mitochondria
- B. Chloroplasts
- C. Both A & B
- D. Vacuole Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Both A & B
Explanation:
The plant cell organelles, "The power house of the cell" mitochondria and the chloroplasts contains their own DNA and ribosomes.
- 4. When does DNA replication happen?
Options- A. S - phase
- B. M - Phase
- C. Prophase
- D. Anaphase Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: S - phase
Explanation:
DNA is replicated during the S-Phase in the interphase of a cell.
- 5. Which of the following is not true of color blindness?
Options- A. Color blind people learn to rely on shapes, patterns, and positions of signs and signals.
- B. Red-green color blindness is the most common type of color blindness.
- C. A color blind person cannot see any colors.
- D. For some people, it might be difficult to recognize colors of traffic lights and signs. Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: A color blind person cannot see any colors.
- 6. All bones stop growing by the end of adolescence.
Options- A. TRUE
- B. FALSE Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: FALSE
Explanation:
The given statement "All bones stop growing by the end of adolescence" is a FALSE statement.
- 7. The organs of the urinary system are
Options- A. Kidney
- B. Urinary bladder
- C. Ureter
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
- 8. Phosphorescence is a phenomenon associated with which algal division?
Options- A. Dinoflagellates
- B. Brown algae
- C. Red algae
- D. Euglenophytes Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Euglenophytes
Explanation:
Phosphorescence is a phenomenon associated with an algal division called euglenophytes.
Phosphorescence is a phenomenon when an object is capable of releasing photons of light at a longer wavelength in response to absorbing light of a shorter wavelength. The object releasing the light only releases the light after some time has passed since it absorbed the light of a short wavelength.
Euglenophytes are single-celled plant-like protists that have no cell wall.
- 9. Which of the following statements about aldosterone is NOT correct?
Options- A. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.
- B. Aldosterone is produced in the adrenal cortex.
- C. Aldosterone is stimulated by decreased plasma sodium levels and increased plasma potassium levels.
- D. All of the above Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.
Explanation:
Aldosterone is a steroid hormone that is produced in the adrenal gland. It is useful and more essential for the conservation of sodium content in the kidney, salivary glands, colon and sweat glands.
Here, Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule is the only option that is NOT correct about aldosterone.
- 10. A lytic infection concludes with the
Options- A. production of a prophage
- B. production of messenger RNA
- C. embedding of viral DNA into the host cell's DNA
- D. bursting of the host cell Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: bursting of the host cell
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