The nonequilibrium created by ____ represents a renewing source of energy
a. temperature gradients
b. acidic ocean vents
c. alkaline ocean vents
d. radioactive decay
e. protocell formation
ANSWER: c
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Which of the following will result in an increase in population?
a. birth rates lower than death rates b. birth rates and death rates equal c. birth rates higher than death rates d. no birth rate and stable death rate
Why do most viruses only infect one type of cell?
a. Viruses can only live in particular environments found within a select group of cells. b. Viruses can only find the necessary components to keep itself alive in one type of cell. c. Viruses can only infect cells that have the appropriate receptors for them to attach to. d. Viruses cannot move throughout the body so only infect the cells they first come into contact with.
In the first experiment to test the pedometer hypothesis in Sahara desert ants, which results did the researchers obtain?
A. Ants with normal legs walked past the home nest, ants with stumps found the nest, ants with stilts were short of the nest B. Ants with stilts walked past the home nest, ants with normal legs found the nest, ants with stumps were short of the nest C. Ants with stumps walked past the home nest, ants with normal legs found the nest, ants with stilts were short of the nest D. None of the above
If a person were unable to produce much of this substance, the gastric juices might destroy the stomach lining
A) pepsin B) chyme C) HCl D) mucus