51. The number of mitochondria per cell depends upon the...
A. Physiological activity of the cell
B. Types of cell
C. Shape of cell
D. Size of cell
Answer : Option A
53. Which structure serves as a protective layer agaimst attack by phagocytes and by viruses?
54. How much diameter of ribosome in prokaryotic cell?
55. Which organelle possesses circular DNA?
(A) Cell is a structural and functional unit of living organisms.
(R) New cells are not formed by cell division of preexisting cells.
A. Assertion (A) and Reason (R) both are true and reason (B) is correct explanation of the assertion A.
B. Assertion (A) and Reason (R) both are true but reason B is not a correct explanation of the asserti
C. Assertion (A) is true but Reason (B) is false.
D. Assertion (A) is false but Reason B is true.
Answer : Option C
(A)The blue green algae is a prokaryotic.
(R)The blue green algae possess 70s ribosomes.
A. Assertion (A) and Reason (R) both are true and reason (B) is correct explanation of the assertion A.
B. Assertion (A) and Reason (R) both are true but reason B is not a correct explanation of the assertion (A)
C. Assertion (A) is true but Reason (B) is false.
D. Assertion (A) is false but Reason B is true.
Answer : Option A
(A)Some Bacteria are gram-negative.
(R)Fermicute can be stained by Gram stain.
A. Assertion (A) and Reason (R) both are true and reason (B) is correct explanation of the assertion A.
B. Assertion (A) and Reason (R) both are true but reason B is not a correct explanation of the assertion (A)
C. Assertion (A) is true but Reason (B) is false.
D. Assertion (A) is false but Reason B is true.
Answer : Option B
(A)In mitochondria inner layer has many folding which is known as cristae.
(R)In cristae ETS occurs.
A. Assertion (A) and Reason (R) both are true and reason (B) is correct explanation of the assertion A.
B. Assertion (A) and Reason (R) both are true but reason B is not a correct explanation of the assertion (A)
C. Assertion (A) is true but Reason (B) is false.
D. Assertion (A) is false but Reason B is true.
Answer : Option B
(A)Mesosome are formed by a specialized differentiated form of cell membrane.
(R)Cell membrane is the lamellas envelop.
A. Assertion (A) and Reason (R) both are true and reason (B) is correct explanation of the assertion A.
B. Assertion (A) and Reason (R) both are true but reason B is not a correct explanation of the assertion (A)
C. Assertion (A) is true but Reason (B) is false.
D. Assertion (A) is false but Reason B is true.
Answer : Option A