Which of the following sex chromosome abnormalities have detectable phenotypic effects? (Choose all that apply)
A. 47, XYY
B. 47, XXX
C. 45, X
D. 47, XXY
E. 47, +21
C,D,E
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In the reaction H2O + CO2 + carbonic anhydrase --> H+ + HCO3-+ carbonic anhydrase, carbonic anhydrase is a(n)
a. reactant. b. product. c. enzyme. d. active site
What is the thin, muscular tube through which urine leaves each mammalian kidney?
A) Ureter B) Collecting duct C) Nephron D) Bladder E) Urethra
A photograph of a Victorian trophy room shows the heads of 15 species of hoofed mammals, all shot within a day's walk of a single hunting camp in Africa. This camp was probably located in
A) tropical rain forest. B) chaparral. C) savanna. D) desert.
Which of the following statements regarding DNA replication is true?
A) Bacterial replication is faster than eukaryotic replication. B) DNA replication during embryonic development occurs at a slower rate than in the early stages of neonatal life. C) Early-replicating genes are those that are not actively transcribed. D) The rate of DNA replication is constant at all stages of development in eukaryotes. E) Cyclin-dependent kinases (Cdk) are not involved in the DNA replication process.