The mutated gene that causes cystic fibrosis is
a. CFTR
b. CRFT
c. CTFR
d. CRTF
e. CFRT
A
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The jaws of vertebrates evolved from the:
A. gill cartilage of jawless fish. B. gill cartilage of ancient sharks. C. cartilage supporting the nostrils of jawless fishes. D. ear bones of ancient fish. E. first two vertebrae of ancient fish.
Which of the following is correct about
melatonin?
a. it protects against certain cancers b. it encourages the growth of certain cancers c. it causes a decline in body temperature d. all of these (a through c) are correct about melatonin e. one of these (a through c) is incorrect about melatonin
What is a neuronal attribute that contributes to the resting membrane potential?
a. Potassium is kept at a high concentration outside the cell compared with the inside. b. Sodium is kept at a high concentration inside the cell compared with the outside. c. Neurons are more permeable to sodium than they are to potassium. d. The cytosol contains large molecules that have a net positive charge. e. The cytosol contains large molecules that have a net negative charge.
Which situation could represent kin selection in action?
A) You help your friend learn linguistics, and your friend helps you learn biology. B) You help your brother pay for his children's college tuition, even though he may not be able to pay you back. C) You help your mother pay her property taxes when she gets old. D) You inexplicably forget to use birth control, and a child results.