What is the function of the vasa recta?
A. It maintains the concentration gradient
established by the loop of Henle.
B. It helps determine the final concentration
of the urine.
C. It filters the blood within the glomerulus.
D. It secretes the hormone renin in response
to a drop in blood pressure.
E. None of these answer options is correct.
A
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Which of the following nitrogenous bases is usually found in RNA but not in DNA?
A. Adenine B. Uracil C. Thymine D. Guanine
Genes are said to be linked when:
A. they lie on the same chromosome. B. they lie on the same chromosome and are greater than 50 map units apart. C. they lie on the same chromosome and are less than 50 map units apart. D. they are alleles of the same gene. E. None of these choices are correct.
Which of the following classifications includes the fewest human pathogens?
a. archaeans b. prokaryotes c. pathogens are distributed fairly equally among the groups d. eukaryotes
How much of Europe’s population was wiped out by the Black Death?
a. 1/2 b. 1/3 c. 1/4 d. 1/5 e. 1/6