Which of the following is an accessory organ of the human digestive system?
A. Salivary gland
B. Esophagus
C. Stomach
D. Small intestine
E. Large intestine
Answer: A
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Which of the following is the most likely explanation for the lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans?
A) There has not been enough time to evolve such a barrier. B) Such a barrier would probably also block important molecules that need to be passed to the fetus. C) The maternal and fetal blood mix directly together in an area with many villi, so a barrier is impossible. D) Alcohol has some positive effects on the fetus, so evolution has resulted in an intermediate level of filtering that blocks all but the worst abuses of alcohol.
Homosexuality
A) is seen only in humans. B) reflects the input of a number of genes and environmental factors. C) is inherited from a mutation on the X chromosome. D) is only the result of environmental influences.
How much animal protein consumed by humans is from fish and shellfish?
a. 26% b. 21% c. 16% d. 11%
As the polypeptide is elongating during translation, what is the ribosome doing?
a. removing incorrectly added amino acids b. moving along the mRNA transcript bonding amino acids to each other c. travelling back and forth between the nucleus and the growing polypeptide with information on which amino acids to add d. removing the non-coding introns e. breaking hydrogen bonds between the tRNA and the mRNA