Binding of a protein hormone may lead to formation
of a __________, which relays a signal into the cell. Fill in the blank(s) with the appropriate word(s).
Answer: second messenger
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How many different types of chemoreceptors can be found in the taste buds?
A. hundreds B. thousands C. 40-50 D. five
A pollen tube together with its contents of male gametes constitutes the ____
a. male reproductive organ b. endosperm mother cell c. mature male sporophyte d. immature male gametophyte e. mature male gametophyte
Edward Jenner noticed that the milkmaids who milked cows by hand often were infected with cowpox and that their infections were mild. He also noticed that these same milkmaids did not contract smallpox, which was a much more serious disease. He presumed that the cowpox infections prevented the milkmaids from contracting the much more serious disease of smallpox. Subsequently he began vaccinating people with the pus-like material from cowpox lesions to determine if his thinking was correct. In the story above, the underlined portion is a(n)
A. hypothesis. B. observation. C. theory. D. experiment.
Which pairs of hormones have opposite effects?
A) testosterone and melatonin B) progesterone and insulin C) parathyroid hormone and calcitonin D) oxytocin and prolactin