When the proton and electron number are unequal, the atom or molecule _____

a. gains or loses a proton
b. forms a covalent bond with another atom
c. is an ion
b. becomes part of a molecule


Ans: c. is an ion

Biology & Microbiology

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Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,

a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called

a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.

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Gases diffuse down a ____ gradient

a. volume b. temperature c. osmotic d. partial pressure e. chemical

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All of the following are true of the process of

phosphorylation EXCEPT that a. a molecule gains a phosphate group. b. a molecule loses a phosphate group. c. molecules become less stable. d. it is used to prime molecules to react. e. it produces ADP from ATP.

Biology & Microbiology

When penicillin was introduced, how long did it take for penicillin-resistant strains of bacteria to emerge?

A. 25 years B. 4 years C. 6 months D. 1 year E. 10 years

Biology & Microbiology