If a fetus contains an X and a Y chromosome but a defective SRY gene, they will develop
A. into an anatomical male because testosterone is present.
B. into a hermaphrodite due to the presence of estrogen and testosterone.
C. into an anatomical female because testosterone is not present.
D. into an anatomical female because testosterone is present.
E. into an anatomical male because testosterone is not present.
Answer: C
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Pasteur used swan-neck flasks in his experiments to prove that
A. dust in air was a source of living microorganisms. B. microorganisms could cause disease. C. microorganisms could be grown in laboratory infusions. D. air had "vital forces" capable of spontaneous generation. E. microbial fermentation could be used to make wine.
Which of the following chemical differences contribute to increased structural variety of RNA over DNA?
A. In addition to the double-stranded regions, virtually all of the unpaired bases are involved in base stacking interactions, increasing the variety and stability of RNA. B. Since RNA molecules have no pucker the sugar molecules are flat and can add to stacking stabilization. C. Base stacking contributes less to RNA stability because fewerbases are paired. D. Because ribose has one less hydroxyl group there are fewer opportunities for RNA to hydrogen bond. E. Different sugar puckers cause the phosphates in the RNA backbone to be farther apart.
How many different types of amino acids are found in proteins?
A) 4 B) 1,000 C) 200 D) 100 E) 20
When tracing the path of blood, the blood vessel that follows the renal artery is the
A. peritubular capillary B. efferent arteriole C. afferent arteriole D. renal vein E. glomerulus