Which of the following is true of X chromosome expression in female mammals?
a. All genes are expressed
b. Both X chromosomes are activated.
c. The Y chromosome is suppressed.
d. One X chromosome is inactivated.
d
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The famous "bell-shaped curve" that usually
results when test scores are plotted against number of students is an example of what type of selection? a. disruptive b. stabilizing c. divergent d. variable e. directional
The large intestine is the longest part of the digestive tract
Indicate whether the statement is true or false.
One biological example of a positive feedback system is
A) blood pH levels. B) water balance. C) temperature regulation. D) mammalian birth.
Following an endospore stain, how does one distinguish endospores from vegetative cells?
a. Vegetative cells are pink, endospores are green. b. Vegetative cells are pink, endospores are purple. c. Vegetative cells are purple, endospores are pink. d. Vegetative cells are green, endospores are pink.