Cholesterol functions in the plasma membrane to
A. transport ions.
B. serve as an energy molecule.
C. maintain fluidity.
D. mediate steroid action.
E. maintain hypertension.
C
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Pair-rule developmental genes belong to which class of pattern-regulating genes?
A. homeotic B. maternal C. segmentation D. None of the choices is correct.
In the internal leaf structure shown above, the item labeled "1" is
a. a vascular bundle. b. spongy mesophyll. c. epidermis. d. a stoma. e. palisade mesophyll.
Which of the following is not a part of the axial skeleton?
a. skull b. vertebral column c. ribs d. pelvis e. sternum
In recombinant DNA technology, plasmids may be used to:
A. introduce foreign DNA into bacteria B. cut DNA at a specific location C. introduce foreign DNA into human cells D. activate restriction enzymes