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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Most of the functions of plasma membranes are

carried out by a. cholesterol. b. proteins. c. hydrophilic heads. d. hydrophobic tails. e. carbohydrates.

Biology & Microbiology

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.

Biology & Microbiology