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
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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.
What are the cells that are specialized to produce and conduct electrochemical impulses called?
A. neurons B. dendrites C. axons D. fibroblasts E. astrocytes
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
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.