Why do cancer cells induced by DNA viruses preferentially carry copies of viral "early" gene fragments more than "late" genes?
a) Early genes encourage cell cycle arrest
b) Early genes integrate into the host genome whereas late genes do not
c) Early genes stay silent whereas late genes are actively expressed
d) Early genes are responsible for encouraging cell cycle progression into S phase
Answer: d) Early genes are responsible for encouraging cell cycle progression into S phase
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Which of the following statements about chlamydial infections is TRUE?
A) Chlamydial diseases are not reportable diseases. B) Chlamydial diseases are less prevalent than gonorrhea. C) Chlamydial diseases can lead to acute complications. D) All of the statements are true.
The Southern Hemisphere has no equivalent of the boreal forest of the north. Why?
a. It has no latitudes near the poles. b. It has insufficient altitudes
c. It has no land in the corresponding latitudes. d. It is too close to the sun during the winter. e. It has an inhospitable temperature
The filtrate removed from the blood by the kidneys might contain
a. salts, amino acids, glucose, and urea b. ammonia, red blood cells, and minerals c. fat, urea, and water d. salts, urea, and plasma
The passageway that channels ova from the ovary into the uterus is known as
a) a vagina b) a uterus c) a fallopian tube d) an endometrium e) a cyst