Which of the following proteins play a role in the regulation of RecA?
A. RecBCD
B. RecFOR
C. RecX
D. DinI
E. All of the proteins given regulate RecA.
E
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Which one of the following statements about homeotic, or Hox, genes is not correct?
A. Drosophila contain 8 Hox genes arranged in two clusters, the Antennapedia complex and the Bithorax complex. B. Hox genes are arranged in order according to their relationship with the anterior-posterior segmentation. C. Timing of expression corresponds to chromosomal order and location of expression. For example, anterior genes "turn on" earlier compared to those expressed in the posterior. D. The linear order of Hox genes along the chromosome, the anterior-posterior orientation of the embryo, and timing of expression for the genes in Hox clusters is observed only in Drosophila. E. Many of the genes in the mammalian Hox clusters have redundant or overlapping functions.
Which of the following is not an effect of epinephrine throughout the body?
A. Promotes the breakdown of glycogen in skeletal muscle cells B. Relaxes lung airways C. Stimulates heart muscle cells D. A person feeling energized after drinking a cup of caffeinated coffee E. The body's ability to digest a large meal
You are a virologist studying a particularly pathogenic virus that infects sea turtles. In the course of your research, you discover that the virus is destroyed by a protein-digesting enzyme. The structure most vulnerable to this enzyme must be the viral
a. membrane. b. envelope. c. DNA. d. capsid.
The process by which viruses can exchange genetic sequences to come up with a "new" virus such as H1N1 is:
A) reassortment. B) conjugation. C) independent assortment. D) recombination.