Which of the following are arranged in the sequence in which the various taxa first appeared in time?
A. bacteria, protists, liverworts, lycophytes, streptophytes, angiosperms, gnetophytes.
B. prokaryotes, protists, mosses, streptophytes, conifers, ferns, angiosperms.
C. bacteria, streptophytes, protists, mosses, angiosperms, cycads.
D. protists, prokaryotes, streptophytes, ferns, mosses, angiosperms, conifers.
E. prokaryotes, protists, streptophytes, mosses, ferns, conifers, angiosperms.
E. prokaryotes, protists, streptophytes, mosses, ferns, conifers, angiosperms.
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Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____
A) convergent evolution B) a homologous structure C) natural selection D) a vestigial trait
Receptor-mediated endocytosis brings in specific material by engulfing it in vesicles. What factors, either directly or indirectly, are related to this process? Choose all that apply.
_____ It is a passive process. _____ It helps to increase membrane fluidity by helping to transport cholesterol into the cell. _____ It is an active process. _____ It uses carrier proteins. _____ A clathrin coat is present.
Highly acidic gastric secretions are kept from leaking out of the stomach by
a. desmosomes. b. tight junctions. c. adhering junctions. d. gap junctions. e. intercalated discs.
The chromosomes and genes are actually replicated during
A) interphase. B) telophase. C) prophase. D) anaphase. E) metaphase.