Males that tend to be taller than average and show mild mental impairment may have
A. XXY chromosomes.
B. XYY chromosomes.
C. Turner syndrome.
D. Down syndrome.
E. Klinefelter syndrome.
Answer: B
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What is the hormone that stimulates the bone marrow to produce more red blood cells, as in the case of a hemorrhage?
a. ANH b. TSH c. BSH d. erythropoietin e. renin
An action potential is self-regenerating because positive charges entering an axon cause additional _______ channels to open.
A. K+ leak B. acetylcholine-gated C. voltage-gated Na+ D. voltage- gate K+
The lagging strand is replicated with a series of Okazaki fragments and that is why its synthesis is considered to be
A. continuous. B. antiparallel. C. semiconservative. D. bidirectional. E. discontinuous.
One major function of the 5? cap of a eukaryotic mRNA is
a. to provide a ribosomal binding site. b. to protect the mRNA from degradation. c. to minimize transcriptional errors. d. to provide a binding site for RNA polymerase. e. to catalyze intron removal.