What is the radula's function in mollusks?
A. It is the location for most of the internal organs.
B. It extracts oxygen from surrounding water.
C. It helps the mollusk move.
D. It cuts and scrapes up food.
Answer: D
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Which of the following is NOT true about
action potentials?
a. they cannot move backwards b. they are an example of negative feedback c. they are generated and completed in a matter of milliseconds d. they are only generated if the threshold potential is reached e. they are all the same size
In human females, the ovarian cycle begins when the ________
A) levels of estrogen reach their maximum B) hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH C) level of progesterone drops precipitously D) levels of FSH and LH drop precipitously
In the plant alternation of generations life cycle, the two multicellular stages are the ________.
a) gametophyte and gamete b) gametophyte and sporophyte c) spore and gamete d) sporophyte and spore
The smallest subatomic particle is the ________.
A. neutron B. isotope C. electron D. proton E. ion