Which situation is an example of sexual selection?
A. Cheetahs experience a population bottleneck.
B. Female butterflies have a higher survival rate than male butterflies.
C. Peahens choose to mate with peacocks that have the brightest tails.
D. Bacteria evolve resistance to antibiotics.
C. Peahens choose to mate with peacocks that have the brightest tails.
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The person who described the "wee animalcules" was
A) Robert Hooke. B) Antoni van Leeuwenhoek. C) Louis Pasteur. D) Ferdinand Cohn.
The cavity of the sac that will directly enclose the
embryo is indicated by a. A. b. B. c. C. d. D. e. E.
Given the following events involved in the regulation of blood volume, which one of the following answers best represents the order in which these events occurs?
1. sodium reabsorbed from distal tubules and collecting ducts 3. secretion of renin from juxtaglomerular apparatus 2. secretion of aldosterone 4. decrease in blood volume 5. production of angiotensin II A) 4, 2, 5, 3, 1 B) 4, 5, 2, 1, 3 C) 2, 3, 4, 1, 5 D) 4, 2, 5, 1, 3 E) 1, 4, 5, 2, 3
Which of the following determines the molecular properties and the types of chemical reactions in which a molecule participates?
A) Functional group B) Hydrogen ion concentration C) Hydrogen atoms D) Carbon skeleton