A mammalian female’s
a. cells usually have multiple Barr bodies.
b. body is a mosaic for the X-linked traits she
inherits.
c. Barr bodies are active in some cells.
d. Barr bodies are produced after puberty.
e. X-linked recessive genes are always expressed
because of the deactivation of an X chromosome
in each cell.
Answer: b
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A Barr body exists for the purpose of
a. protein dosage compensation. b. insuring fertilization. c. blocking the activity of the Y chromosome. d. turning on the SRY gene. e. activating master genes
Four of the five vessels listed below carry the same
quality of blood. Select the exception. a. pulmonary artery b. aorta c. hepatic portal vein d. inferior vena cava e. jugular vein
The pulsatile nature of blood pressure is greatest in which blood vessels?
A) capillaries B) arteries C) venules D) arterioles E) vein
Irises and other ____ plants flower only when the hours of darkness fall below a critical value, typically in summer.
A. short-day B. long-day C. annual D. biennial E. perennial