Which of the following is the result of external mutagens?
A. template slippage during replication
B. addition of bulky adducts to the DNA
C. depurination
D. recombination errors
E. replication errors
B
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Which of the following could use reverse transcriptase to transcribe its genome?
A) ssRNA B) dsRNA C) ssDNA D) dsDNA
Which protein relaxes supercoils by nicking the DNA?
A) topoisomerase B) helicase C) primase D) ligase E) telomerase
Which of the following statements is NOT
correct about osmosis and plant cells?
a. Water tends to diffuse from soil into young plant cells, thus creating an osmotic pressure. b. Turgor pushes against the cell walls from the outside, so it keeps the cells plump. c. If the concentration of solutes becomes higher in the soil than in plant cells, water molecules will tend to diffuse out of plant cells. d. The cytoplasm of plant cells would typically contain more solutes than soil water. e. Osmosis is the diffusion of water molecules across the plasma membrane of plant cells.
Chromatids are
a. attached at the centriole. b. a pair of chromosomes, one from the mother and one from the father. c. attached at their centromeres. d. identical until crossing over occurs. e. attached at their centromeres and are identical until crossing over occurs.