Choanoflagellates are of special interest because they resemble the collar cells in land plants

_________________ Indicate whether the statement is true or false.


F, sponges

Biology & Microbiology

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Differentiating cells delete the DNA for genes they do not need

A. true B. false

Biology & Microbiology

Large or polar hormones cannot enter a cell directly. Which of the following molecules can act as a second messenger for such hormones? 

A. catecholamine B. cyclic AMP C. epinephrine D. norepinephrine E. calcitonin

Biology & Microbiology

Which of the following is not a result of estrogen?

A. breast development B. the uterine cycle C. milk production D. body hair distribution E. fat distribution

Biology & Microbiology

A(n) __________ is an area where all precipitation drains into a specific waterway, then on to groundwater, which becomes a source of water for plants.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology