What is the purpose of an enzyme's 3?–5? exonuclease activity?
a. to unwind the double helix
b. to excise incorrectly added bases
c. to polymerize DNA
d. to repair lesions
e. to remove RNA primers
Ans: b
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Direct repeats can cause mutation when
A) a person encounters a mutagen. B) homologs misalign during meiosis such that the first copy of the gene on one chromosome lies opposite the second copy on the homolog. C) introns are not removed promptly and their sequences are included in the gene product. D) they bond within the same DNA strand, forming loops that disrupt replication enzymes.
A membrane is more “fluid” than solid because
a. phospholipid tails prevent close packing. b. proteins can shift positions. c. water is the main component. d. phospholipid tails prevent close packing, and proteins can shift positions. e. phospholipid tails prevent close packing, proteins can shift positions, and water is the main component.
Which of the following structures is the location of gas exchange between the inhaled air and the blood?
A) trachea B) bronchioles C) alveoli D) bronchi E) pleura
Which of the following specimens should not have been a direct Gram stain performed?
A. Stool B. Sputum C. Pleural fluid D. CSF