In Mendel's experiments, if the gene for tall (T1 ) plants was incompletely dominant over the gene for short (T2 ) plants, what would be the result of crossing two T1T2 plants?
A) 50% tall, 25% intermediate, and 25% short
B) All the offspring would be tall.
C) 25% tall, 50% intermediate, and 25% short
D) 25% tall, 25% intermediate, and 50% short
E) All the offspring would be intermediate.
C
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a. nucleoproteins. b. immunoglobulins. c. polysaccharides. d. steroids. e. lipids.
What would happen if the chorion failed to secrete human chorionic gonadotropin?
A) The maternal elements of the placenta would fail to develop. B) The fetal elements of the placenta would fail to develop. C) Neural tube formation would not occur, and the embryo would have no central nervous system. D) The embryo would be spontaneously aborted.
Retroviruses use the enzyme reverse transcriptase to
A) transcribe mRNA from a DNA genome. B) synthesize a hybrid molecule with one DNA stranded base-paired to the complementary RNA strand. C) synthesize double-stranded RNA. D) synthesize sense-stranded mRNA from an antisense RNA genome. E) direct the production of DNA from a single-stranded RNA genome.
Which of the following is a primary structural constituent of the plant cell secondary wall?
A) hemicellulose B) extensin C) collagen D) pectin E) cellulose