Refer to Figure 14-1. The area of the tryptophan operon labeled 3 is the:
a. promoter.
b. repressor gene.
c. ribosome.
d. RNA polymerase.
e. operator
E
You might also like to view...
The accompanying figure illustrates ____
a. anaphase I b. metaphase I c. metaphase II d. crossing over e. migration
The surgical removal of one oviduct would
A. Decrease the time between ovulation and implantation. B. Decrease the number of eggs produced by the ovary. C. Prevent half of a woman's eggs from reaching the uterus.
Anthrax is:
A. a zoonosis. B. transmitted by contact, inhalation, and ingestion. C. a disease that, in humans, can cause a rapidly fatal toxemia and septicemia. D. only seen sporadically in the United States. E. All of the choices are correct.
The normal flora that inhabit our body surfaces ____
a. are harmful b. competitively exclude more harmful species c. produce vitamin C d. become even more beneficial if they invade tissues e. participate in phagocytosis of pathogens