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
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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.
Gases diffuse down a ____ gradient
a. volume b. temperature c. osmotic d. partial pressure e. chemical
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.
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