Chemical bonds that are formed when one atom with a partial positive charge (created from unequal
sharing of electrons) is electrically attracted to another atom with a partial negative charge (also
created from unequal sharing of electrons) are called ____.
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
D
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Which of the following is a difference between a purine and a pyrimidine?
a. Purines have a single ring structure. b. Pyrimidines cannot bind phosphate. c. Pyrimidines are smaller in size. d. Purines are only found in RNA.
Transmitter substances
a. are expelled from the presynaptic cells. b. tend to destroy acetylcholine. c. enter the presynaptic cell to continue the passage of the impulse. d. interact with membrane receptors of the postsynaptic cells. e. are expelled from the presynaptic cells and interact with membrane receptors of the postsynaptic cells.
Which structure helps prokaryotic cells attach to substrates and aid in the exchange of genetic information between cells?
A. flagella B. nucleoid C. pili D. ribosome E. capsule
Which of the following does not contribute to the increasing levels of methane in the atmosphere?
A. Methane production at sewage treatment plants B. Methane production in termites C. Methane production in rice paddies D. Methane production beneath an aerobic water column