Which of the following is not an accurate description of events leading to the lysogenic pathway following viral infection in a bacterium?
A. Upon infection, the linear bacteriophage
DNA forms a circle and transcription is
initiated at promoters PL and PR. The
transcripts from PR encode the proteins cro
and cII.
B. Reduction in the concentration of cI protein
is the most important contributor to lysogeny.
C. Reduced protease activity due to poor
conditions allows cII to accumulate, which
then stimulates transcription from PE and
thus expression of cI.
D. cI protein binds to operator OR ,
preventing cro and cII expression.
E. cI protein stimulates transcription from
promoter PM, leading to even more cI
production. The increased cI binds to
operator OL and inhibits PL.
B
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In allosteric regulation, effector molecules usually bind
A. reversibly and noncovalently. B. reversibly and covalently. C. irreversibly and covalently. D. irreversibly and noncovalently.
Nate is gaining weight, is often tired, and feels cold. His thyroid hormone level is high as is the level of TSH. Nate also has a goiter. Which of these diagnoses is the most likely for Nate's condition?
A) defective thyroid hormone receptors in his body cells B) insufficient iodine in his diet C) defective receptors for thyroid hormone control by the anterior pituitary D) too much iodine in the diet
Which of the following is a "phagocyte"?
a. neutrophil b. eosinophil c. basophil d. lymphocyte
Which of the following are symptoms of septic shock?
A. tachycardia B. reduced blood flow to vital organs. C. respiratory failure D. weak pulse E. All of the choices are correct.