The figure above shows a nephron. Filtration takes place in the structure labeled _____
A) a
B) b
C) c
D) d
Answer: A
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The expression of the lac operon in an E. coli cell missing the gene that encodes for the lac repressor:
A. will increase when lactose is present. B. will decrease when lactose is present. C. will decrease when glucose is present. D. will increase when glucose is present.
Which of the following structures or molecular machines is important for protein degradation in eukaryotes?
A. cytoskeleton B. flagellum C. ribosome D. ATP synthase E. proteasome
What type of cancer causes the most deaths in males?
A. colon and rectum B. pancreas C. lung and bronchus D. esophagus E. prostate
The inner lining of the uterus that is shed at menstruation if fertilization has not occurred is called the ____
a. cervix b. endometrium c. oogonium d. chorion e. epididymis