The evolution of jointed appendages has made __________ very successful.
Fill in the blank(s) with the appropriate word(s).
Arthropods
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Almost 70 percent of women with breast cancer are estrogen-senstive. What does this mean?
A. They are made ill with prescriptions of estrogen. B. Only a small amount of estrogen can exacerbate their symptoms. C. Their own natural estrogen encourages the growth of cancer cells. D. Their cancers go into remission with increased uptake of estrogen. E. They do not produce their own estrogen.
Germ-line mutations
A. can be passed to subsequent generations. B. occur in sex cells. C. may range from having no effect to completely inactivating protein activity. D. All of the answer choices are true about germ-line mutations. E. Only two of the answer choices are true.
Viagra causes dilation of blood vessels and increased blood flow to the penis, facilitating erection. Viagra acts by inhibiting _____
A) the hydrolysis of cGMP to GMP B) the hydrolysis of GTP to GDP C) the dephosphorylation of cGMP D) the removal of GMP from the cell
Skeletal muscles attach to bones by ____
a. ligaments b. cartilage c. smooth muscles d. tendons e. joints