-laying mammals
a. hatch fully developed young from their eggs.
b. are monotremes.
c. are hairless.
d. are confined to South America.
e. bear their young into permanent pouches.
Answer: b
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RNA molecules that also act as enzymes are given the name
A. ribozymes B. cofactors C. coenzymes D. allosteric enzymes
You are working in a lab and come across a gene, Gene X, that you think might explain some of the differences seen between chimpanzees and humans. Which of the following results would support your hypothesis?
A. if Gene X was active in humans, juvenile chimpanzees and inactive in adult chimpanzees B. if Gene X was active in humans, adult chimpanzees and inactive in juvenile chimpanzees C. if Gene X was active in adult humans and adult chimpanzees but inactive in juvenile humans D. if Gene X was active in juvenile humans, juvenile chimpanzees, and adult chimpanzees but inactive in adult humans
The cdc25 phosphatase removes a phosphate from the CDK kinase yielding highly active MPF.
a. true b. false
Major regional groups of interacting terrestrial ecosystems, characterized by climate and geography, are called
A. taigas. B. estuaries. C. tundras. D. biospheres. E. biomes.