A type of DNA damage that may not be reversible is a _____

a) cross-linking
b) base change or loss
c) rung breakage
d) severed side rail


Ans: b) base change or loss

Biology & Microbiology

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Which is not true of a prokaryote cell?

a. it has a nucleus and membrane-bound organelles. b. it lacks membrane-bound organelles. c. it is always within a cell wall. d. it is always single cellular. e. it lacks chromosomes.

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Blue light has energy than red light and is by a green leaf.

A. less; absorbed B. more; absorbed C. more; reflected D. less; reflected E. equal; reflected

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Which of the following is NOT involved in self

versus nonself recognition? a. complement b. MHC markers c. TCRs d. plasma membranes e. HLA

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One significant difference between anthropoids and other primates is the size of their:a

legs. b. arms. c. brains. d. spine. e. feet

Biology & Microbiology