Crossing over
A) is followed immediately by separation of each of the chromatids.
B) prevents genetic recombination.
C) results in only one exchange per homologue.
D) increases variability in gametes.
E) occurs between sister chromatids.
D
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The feeding mode of leeches is described as
a. predaceous. b. internal parasitism. c. external bloodsucking. d. predaceous and external bloodsucking. e. predaceous, external bloodsucking, and internal parasitism.
In photosynthesis, carbon fixation occurs:
A. during photorespiration B. in photosystem II C. in the Calvin cycle D. in photosystem I E. in the electron transport chain
A measure of the degree of disorder in a system is called ________.
Fill in the blank(s) with the appropriate word(s).
Which organ system does NOT play a role in acquiring materials and energy?
A. digestive B. skeletal C. muscular D. cardiovascular