The sheets of red algae used to wrap sushi are actually what stage of the Porphyra life cycle?
a. sporophyte
b. zygote
c. gametes
d. gametophyte
d
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Graph B shows that breeding bird species richness
a. is greater than 1,000 at the equator. b. drops off in northern and southern latitudes. c. is less than that of ants at 30 degrees north latitude. d. drops by more than an order of magnitude at 40 degrees north latitude. e. includes all of these.
The countervailing forces model:
A) depicts business as operating within a market environment, responding primarily to powerful economic forces. B) depicts the BGS relationship as a flow of interactions among the major elements of society. C) shows the corporation at the center of an array of mutual relationships with persons, groups, and entities called stakeholders. D) is depicted in a pyramidal, hierarchical image of society which primarily represents the perspective of business critics.
If a mutation produced helicase that was unable to hydrolyze ATP, DNA replication would be
A. more prone to errors. B. speeded up. C. unaffected. D. stopped.
Adaptive immunity is sometimes also called acquired immunity. Which of the following statements provides a basis for the alternative name?
A. Lymphocytes of the adaptive immune system are highly specific for a single epitope. B. Activated lymphocytes produce daughter cells that are identical in specificity and function. C. To become activated, lymphocytes require exposure to the epitope for which they are specific. D. Activated lymphocytes may persist for years in the body. E. Lymphocytes reactive to normal body components are removed.