Suppose you are comparing the outside and inside halves of a cell membrane's phospholipid bilayer. Which of the following describes the composition of the lipids on the two surfaces?
a. symmetrical but not identical composition
b. asymmetrical composition
c. highly random and varied composition
d. identical composition
Answer: b. asymmetrical composition
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This simple plant tissue consists of dead cells
with thick, lignified cell walls that function in support. This plant tissue is
a. parenchyma. b. sclerenchyma. c. collenchyma. d. xylem. e. phloem
Adjacent water molecules are joined by ________ bonds
A) covalent only B) ionic C) polar and covalent D) hydrogen
A biologist has been studying a mollusk that does not have a shell. It lives in the marine environment. Of the examples given below, which one did the biologist study?
A. clam B. snail C. nautilus D. chiton E. octopus