Which of the following is not true?
A. Ribosomes contain nucleic acid
B. Ribosomes are made of protein.
C. mRNA is read from the 5' to 3' direction
D. New nucleotides are added to the 3' end of the new strand.
Answer: B. Ribosomes are made of protein.
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Digestion of which major nutrient type begins in the stomach?
A. carbohydrates B. lipids C. nucleic acids D. proteins E. vitamins
A researcher tests the hypothesis that large, daily doses of vitamin C help protect against catching the common cold. What would be the best experimental and control group to test this hypothesis?
A. Experimental group: takes a large dose of vitamin C daily; Control group: takes nothing. B. Experimental group: people with a cold are administered vitamin C daily; Control group: people without a cold are not administered vitamin C. C. Experimental group: takes a large dose of vitamin C daily; Control group: takes a large weekly dose of vitamin C. D. Experimental group: takes a large, daily dose of vitamin C; Control group: takes a daily dose of a sugar pill disguised as vitamin C.
Which choice accurately conveys the complexity of neural connections in the human brain?
A) About 100 billion neurons each contact 1,000 to 10,000 other neurons. B) A million or so neurons each contact up to 100 other neurons. C) 10 million or so neurons each contact up to 10,000 other neurons. D) A billion or so neurons each contact up to a million other neurons.
PKU is a recessive disorder. If a woman who has PKU has a child, what is the child’s possible
genotype? A. Homozygous dominant. B. Homozygous recessive. C. Heterozygous. D. The genotype could be any one of these. E. There is not enough information to determine the child’s genotype.