Suggestion: If you would like to select ANSWER A, I suggest you not just place a
ID: 66589 • Letter: S
Question
Suggestion: If you would like to select ANSWER A, I suggest you not just place a comment “A is the right answer” but instead be thorough, say “A is the right answer because ___________”
Which of the following is not a known function of the cytoskeleton?
A) to hold mitochondria and other organelles in place within the cytosol
B) to provide mechanical support to the cell
C) to maintain characteristic shape of the cell
D) to maintain a critical limit on cell size
E) to assist in cell motility by interacting with specialized motor proteins
Why is an RNA primer considered essential during DNA synthesis by DNA polymerase?
A) The enzyme requires a free 3'-PO4 group.
B) The enzyme requires a free 5'-PO4 group.
C) The enzyme requires a free 5'-OH group.
D) The enzyme requires a free 3'-OH group.
E) There is no particular reason; this is simply the observation.
What happens when RNA polymerase hits a stop codon?
A. Transcription stops at that point.
B. Translation stops making the polypeptide.
C. Transcription continues until a transcription termination site is reached.
D. Replication continues until a termination site is reached which terminates replication.
E. None of the above
Explanation / Answer
1) The cytoskeleton includes many critical roles like maintaining cell shape, its protection. cellular motion or mobility, intracellular transport etc. However, it has hardly any role in limiting cell size. The factor mean to limit cell size includes the surface area to volume ratio, nucleo-cytoplasmic ratio, the fragility of the cell membrane, mechanical structures. So, the ans is (D)
2) DNA polymerase has 5'-3' activity and thus requires a free 3'-OH group to initiate DNA synthesis. So, the ans is (D).
3) When the RNA polymerase hits the stop codon (a process involve with the translation process) causes the polypeptide formation to stop. SO, the ans is (B)
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