Historically inaccurate diagnosis of acid reflux disorders and gastric ulcers has been improved by _____
A) pH monitoring
B) X-ray technology
C) screening for H. pylori infections
D) colonoscopy
E) sonography
Answer: C
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Athlete's foot is caused by
A. Aspergillus. B. Ergot. C. Candida. D. Claviceps. E. None of the choices provided.
Treponema pallidum
A. can cross the placenta. B. has a hooked tip to attach to epithelium. C. is transmitted by direct sexual contact. D. has humans as the sole reservoir. E. All of the choices are correct.
. If a daughter expresses an X-linked recessive trait, she inherited the trait from ____
a. her mother b. her father c. both parents d. neither parent e. her grandmother
Why is there a need to produce Okazaki fragments on the lagging strand, but not on the leading strand of DNA?
A. By having one leading strand and one lagging strand the cell can limit the amount of DNA polymerase used for chromosomal replication. B. There is not enough cellular DNA ligase for bonding Okazaki fragments together if they were produced from both parental strands. C. The two parental strands of DNA are antiparallel and DNA polymerase makes DNA in the 5? to 3? direction only. D. The leading strand opens first, and so Okazaki fragments are not needed. The lagging strand unwinds second resulting in the need to produce Okazaki fragments. E. It is substantially more efficient to make several shorter strands rather than one longer strand of DNA.