The gut develops from the ____in most animal embryos
a. schizocoelom
b. mesoglea
c. archenteron
d. enterocoelom
e. blastopore
ANSWER: c
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What will be an ideal response?
An action potential begins when
a. sodium channels open. b. potassium channels open. c. both sodium and potassium channels open. d. sodium channels close. e. both sodium and potassium channels close
Why are adhering junctions common in tissues subject to constant abrasion or stretching, such as skin?
a. These cells need to communicate by allowing cytoplasm to flow between adjacent cells. b. The cells in these tissues require strong cell-to-cell junctions to hold them together. c. Adhering junctions prevent harsh enzymes from flowing between adjacent cells.
d. These tissues do not have basement membranes. e. Adhering junctions allow production of a protective cuticle.
In June 2001 an announcement was made that a draft sequence of the ____________________ nucleotides in the
human genome had been finished. a. 350 million b. 990 million c. 1.1 billion d. 3.2 billion e. 56 billion