The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

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#Question id: 32221

#Unit 2. Cellular Organization

Which of the following statements is correct regarding mutations in the LDL receptor (LDLR) gene in patients with familial hypercholesterolemia?

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#Question id: 12114

#Unit 10. Ecological Principles

Researchers have found that a region of the canary forebrain shrinks during the nonbreeding season and enlarges when breeding season begins. This annual enlargement of brain tissue is probably associated with the annual

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#Question id: 1431

#Unit 4. Cell Communication and Cell Signaling

Which of the following is NOT a role for the tumor microenvironment?

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#Question id: 22973

#Unit 7. System Physiology – Animal

Which enzyme converts 25-hydroxycholecalciferol to the active form, 1,25-dihydroxycholecalciferol.

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#Question id: 31331

#Unit 7. System Physiology – Animal

Which of the following has the greatest effect on the ability of blood to transport oxygen?