Acetic acid gives vinegar its sour taste. The functional group of this acid is
A. ?NH2.
B. ?OH.
C. ?CO.
D. ?SH.
E. ?COOH.
Answer: E
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The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes. The hollow, grape-like structures are the________________.
A. alveoli B. spiracles C. papulae D. lamellae E. bronchi
In what way are vitamins and essential amino acids similar in human metabolism?
A. Both are integral parts of membrane lipids. B. They cannot be synthesized and must be ingested. C. Both are needed to synthesize steroid hormones. D. They are derived from the same precursor molecules. E. Both contain metal ions.
This vitamin can prevent spina bifida. _____
A) Human chorionic gonadotropin
B) Zygote
C) Chorion
D) Morula
E) Folic acid
F) Fertilization
G) Blastocyst
H) Parturition
I) Cleavage
J) Ovulation
K) Placenta
L) Implantation
Which gas was the least abundant in the earth's atmosphere 3.5 billion years ago?
A. oxygen B. nitrogen C. carbon dioxide D. carbon monoxide