In an experimental situation, a student researcher inserts an mRNA molecule into a eukaryotic cell after he has removed its 5' cap and poly-A tail. Which of the following would you expect him to find?
A. The molecule is digested by restriction enzymes in the nucleus.
B. The molecule is digested by exonucleases since it is no longer protected at the 5' end.
C. The molecule attaches to a ribosome and is translated, but more slowly.
D. The cell recognizes the absence of the tail and polyadenylates the mRNA.
E. The mRNA could not exit the nucleus to be transcribed.
Ans: B. The molecule is digested by exonucleases since it is no longer protected at the 5' end.
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Answer the following statement true (T) or false (F)
EGF (epidermal growth factor) activates cell division by binding ________.
Fill in the blank(s) with the appropriate word(s).
The DNA molecules contain six different bases
a. True b. False Indicate whether the statement is true or false
Which of the following is not a checkpoint in the cell cycle?
A. The G1/S transition D. Late metaphase B. The S/G2 transition E. The prophase/ metaphase transition C. The G2/M transition