The larva in Figure 31-4 is:
A. a veliger.
B. a glochidium.
C. a trochophore.
D. a nauplius.
E. a pupa.
C
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Which of the following statements is true of the seeds of both gymnosperms and angiosperms? Select all correct choices
A. Seeds from both plants contain a triploid (3n) endosperm. B. Seeds from both plants contain a diploid (2n) embryo. C. Seeds from both plants contain a diploid (2n) seed coat. D. Seeds from both plants contain a haploid (1n) male gametophyte.
A CD4+ T cell binds to an antigen only if this antigenis ____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
Gas exchange between the air and a cell in an insect tracheal system occurs at the ____
a. trachea b. tracheal branches c. gill filaments d. tracheoles e. spiracles
Coupled reactions are reactions in which an
A. exergonic reaction drives a spontaneous reaction. B. exergonic or endergonic reaction provides products not used for other reactions. C. exergonic reaction drives an endergonic reaction. D. endergonic reaction drives a spontaneous reaction. E. endergonic reaction drives an exergonic reaction.