Which of the following is a case of altruism?
A. A plant releases allelopathic chemicals, harming its competitors and itself.
B. A prairie dog gives up a foraging opportunity to keep watch for predators.
C. A shrimp digs a burrow that it shares with a goby that keeps watch for predators.
D. A baby bird aggressively begs, resulting in less food available to its siblings.
E. Individuals in a flock of birds are less susceptible to predators than individuals alone.
Answer: B. A prairie dog gives up a foraging opportunity to keep watch for predators.
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Life probably originated during which geologic time?
a. Archaean b. Cenozoic c. Mesozoic d. Carboniferous e. Pennsylvanian
The appendix is part of the
a. cecum. b. colon. c. rectum. d. small intestine. e. stomach
Name the structure in which proteins associate with DNA and pack it very tightly by organizing the molecules.
A. Histones B. Chromosomes C. Lysosomes D. Ribosomes E. Homologous lysosomes
What makes the rough endoplasmic reticulum rough?
A) It is covered with cilia. B) It is covered with ribosomes. C) Its surface is highly folded to increase surface area. D) It is covered with tiny flagella. E) It has a high density of receptor proteins in its membrane.