What are the primary regulator units that control endospore formation?
A) allosteric proteins
B) antisense RNAs
C) riboswitches
D) sigma factors
Answer: D
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Speciation is the divergence of two populations from a common ancestor. How does it contribute to biological diversity?
A. Speciation increases biological diversity. B. Speciation decreases biological diversity. C. Speciation has no effect on biological diversity.
True or false: Predator/prey relationships are always linear, with one species affecting only one other in the community
A. true B. false
Early blood cells and germ cells that become gametes arise from the
a. allantois. b. amnion. c. chorion. d. umbilical cord. e. yolk sac.
Cells move to new positions as an embryo establishes its three germ-tissue layers during _____
A) determination B) cleavage C) induction D) gastrulation