During transcription of the trp operon, pairing of regions 2 and 3 in the leader peptide mRNA creates a(n) ________ signal
A) continuous
B) termination
C) antitermination
D) induction
E) repression
C
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The extent and duration of cellular response to a signal depend on:
A. the binding affinity of the receptor to the signaling molecule. B. the concentration of the signaling molecule in the vicinity of the receptor. C. the level of expression of the signaltransduction proteins. D. the level of expression of the terminating proteins. E. All of these choices are correct.
The process of regional economic growth through cumulative causation leads to
A) an expansion of taxes the regional government can collect. B) a drop in the amount of skilled labor in the region. C) corresponding rapid growth in distant areas with economic difficulties. D) the increased formation of forward linkages and the eventual ending of backward linkages.
Which mineral is essential to the production of thyroid hormone?
a. iron b. calcium c. sodium d. potassium e. iodine
Molly, a 3-year-old active preschool girl, spent the morning playing with the other children at the day-care center. Shortly after lunch, she began to appear very flushed with bright red cheeks, and a check of her temperature revealed a low-grade fever of 99.5. She seemed to feel normal and showed no other signs of illness. Which of the following would be the most likely cause of her fever and bright red cheeks?
A) Human Parvovirus B19 B) Roseola virus (Human herpesvirus 6) C) Varicella-zoster virus D) Herpes simplex virus E) Cytomegalovirus