Prions ____
a. are more complex than viruses
b. have large DNA genomes
c. cause neurodegenerative disorders in mammals
d. infect plant cells
e. encode their own polymerases for nucleic acid replication
ANSWER: c
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How do altruistic behaviors arise through natural selection?
A) By his/her actions, the altruist increases the likelihood that some of its genes will be passed on to the next generation. B) The altruist is appreciated by other members of the population because its survivability has been enhanced by virtue of its risky behavior. C) Animals that perform altruistic acts are allowed by their population to breed more, thereby passing on their behavior genes to future generations. D) Altruistic behaviors lower stress in populations, which increases the survivability of all the members of the population.
What is typically the first step in the scientific method?
A. Carrying out an experiment B. Making a prediction C. Making an observation D. Developing a hypothesis
For osmosis to occur, ____
a. a selectively permeable membrane must be present b. a concentration gradient cannot exist c. cellular energy must be expended d. pure water must be on one side of the membrane e. only solutes can pass through the membrane
Which reason does not explain the presence of bicarbonate in seawater as being important? a. Bicarbonate makes seawater slightly alkaline
b. Bicarbonate is able to release hydrogen ions in the water. c. Bicarbonate is able to maintain a stable environment for marine organisms. d. Bicarbonate is able to maintain pH levels at a relatively constant value.