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

Biology & Microbiology

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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

Biology & Microbiology

Which are the products of the second part of glycolysis?

a. Two pyruvate molecules b. NADH only c. ATP and NADH d. ATP only

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology