Plant activities that follow a biological clock so that they are based on cycles of about 24 hours are

a. gravitropisms.
b. photoperiodisms.
c. thigmotropisms.
d. circadian rhythms.
e. phototropisms.


D

Biology & Microbiology

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A gene pool is

A. all the genes in a population. B. the genes that are unique to a species. C. a group of species that look alike but are not located in the same area at the same time. D. all the similar genes in a gene family. E. a swimming hole for geneticists.

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In eukaryotes, translation takes place  

A.  on the plasma membrane. B.  inside the nucleus. C.  on ribosomes. D.  on the nuclear membrane. E.  on spliceosomes.

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What are the cells that are specialized to produce and conduct electrochemical impulses called?  

A.  neurons B.  dendrites C.  axons D.  fibroblasts E.  astrocytes

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The head of a sperm is capped with an organelle that contains glycoprotein-digesting enzymes. What is this organelle called?  

A.  zona pellucida B.  acrosome C.  granulosa D.  blastula E.  neural cap

Biology & Microbiology