A radiation dose of 400 rem, if untreated, causes death within 60 days of about
____________________ percent of people exposed to it. Fill in the blank(s) with the appropriate word(s).
ANS: 50
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Archaea have very diverse environmental requirements and tolerances. From what you have learned about them, which among the following conditions or substances do ALL archaeans require for survival and reproduction?
A. oxygen B. carbon C. moderate pH D. moderate temperature E. moderate salinity
The molecule shown above is ____, having ____
a. unsaturated; a carbon-carbon double bond b. saturated; a carbon-carbon double bond c. unsaturated; no carbon-carbon double bonds d. saturated; no carbon-carbon double bonds e. saturated; a carbon-carbon triple bond
Most of the functions of plasma membranes are
carried out by a. cholesterol. b. proteins. c. hydrophilic heads. d. hydrophobic tails. e. carbohydrates.
Exponential growth occurs
A) only in laboratory populations. B) only in theory, never in actual populations. C) frequently in natural populations. D) only for a limited time in natural populations. E) at regular intervals in natural populations.