Which of the following is not a typical component of an animal cell's plasma membrane?
A. protein
B. lipid
C. nucleic acid
D. carbohydrate
Answer Key: C
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Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a _______ heart while vertebrates have a _______ heart.
A. neurogenic, myogenic B. myogenic, neurogenic C. neurogenic, cardiogenic D. cardiogenic, myogenic E. autonomous, neurally controlled
Which are the products of the second part of glycolysis?
a. Two pyruvate molecules b. NADH only c. ATP and NADH d. ATP only
Which is(are) the principal substance(s) that
regulate(s) thigmotropism? a. auxin and ethylene b. gibberellin and ethylene c. abscisic acid and auxin d. cytokinin and abscisic acid e. none of these
What process or enzyme was used for Step 1 in Figure 15-1?
a. PCR
b. a bacteriophage
c. a reverse transcriptase
d. a DNA ligase
e. a restriction enzyme