Cell Structure And Functions(Life Sciences ) Questions and Answers

Question 1. Which region of chromatin is transcriptionally silent?
  1.    Nucleoid
  2.    Centromere
  3.    Euchromatin
  4.    Heterochromatin
Explanation:-
Answer: Option D. -> Heterochromatin
Answer: (d).Heterochromatin
Question 2. The site of aerobic respiration in eukaryotic cells is___________
  1.    Peroxisome
  2.    Plastid
  3.    Mitochondria
  4.    Cilia
Explanation:-
Answer: Option C. -> Mitochondria
Answer: (c).Mitochondria
Question 3. The inner membrane of mitochondria is fairly smooth.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option B. -> False
Answer: (b).False
Question 4. Which of the following division technique is similar in mitochondria and bacteria?
  1.    Binary fission
  2.    Budding
  3.    Binary fusion
  4.    Meiosis
Explanation:-
Answer: Option A. -> Binary fission
Answer: (a).Binary fission
Question 5. How do the small molecules pass through the outer membrane of mitochondria?
  1.    ATP pump
  2.    Carrier protein
  3.    Channels
  4.    Porins
Explanation:-
Answer: Option D. -> Porins
Answer: (d).Porins
Question 6. Which of the following is occluding junction?
  1.    Adherence junction
  2.    Desmosomes
  3.    Tight junction
  4.    Gap junction
Explanation:-
Answer: Option C. -> Tight junction
Answer: (c).Tight junction
Question 7. Arrange the following sequence of extracellular signaling in the correct order?
1) Transport of signal to a target
2) Start of signal transduction pathways
3) Signaling cell synthesize and release signaling molecules
4) Binding of the signal to the specific receptor
  1.    2, 3, 4, 1
  2.    3, 1, 4, 2
  3.    1, 2, 3, 4
  4.    1, 3, 4, 2
Explanation:-
Answer: Option B. -> 3, 1, 4, 2
Answer: (b).3, 1, 4, 2
Question 8. Which of the following signaling pathway is followed by T-lymphocytes in response to antigenic stimulation?
  1.    Autocrine signaling
  2.    Juxtacrine signaling
  3.    Paracrine signaling
  4.    Endocrine signaling
Explanation:-
Answer: Option A. -> Autocrine signaling
Answer: (a).Autocrine signaling
Question 9. In endocrine signaling, the signal molecule act on target cell only in close proximity.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option B. -> False
Answer: (b).False
Question 10. Which of the following signal molecule is NOT used for extracellular signaling?
  1.    Autocrine
  2.    Endocrine
  3.    Paracrine
  4.    Cyclic AMP
Explanation:-
Answer: Option D. -> Cyclic AMP
Answer: (d).Cyclic AMP
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