A physician sees a new patient who is 25 years old. The patient reports that she has been experiencing recurrent ear, nose, and throat problems resulting from various infections since she was about 5 years old. The infections last for long periods of
time and are difficult to treat. The physician suspects that the patient may have
A) an autoimmune disorder.
B) an allergic reaction.
C) an immunodeficiency disorder.
D) abnormal levels of allergens.
Answer: C
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If all of the variation in a trait in the population is due to differences in the environment, then the mean phenotype of the offspring would be independent of parental phenotype and would be identical to the mean phenotype of the population
A. true B. false
When characterizing DNA gyrase, the Cozzarelli group added a minimal amount of ATP to the reaction tubes containing DNA and gyrase. They did this in order to:
A. confirm that ATP would cause the reaction to reverse and the relaxed DNA would revert to supercoiled form. B. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 1 C. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 2 D. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 1 E. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 2
Cleavage produces the
a. zygote. b. blastula. c. gastrula. d. puff. e. third germ layer.
In general, microtubules disassemble and consequently pull the chromatids to the ends of the spindle. When does this occur?
a. during interphase b. during prophase c. during metaphase d. during anaphase