The sun's energy is produced by:
a. nuclear fission reactions.
b. nuclear fusion reactions.
c. electromagnetic radiation.
d. ultraviolet radiation.
e. infrared radiation
B
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Large numbers of ribosomes are present in cells that produce which of the following molecules?
A. steroids B. lipids C. glucose D. starches E. proteins
The products of genes that are switched on in
specific tissues at specific stages of development affect mainly a. gene replication. b. gene transcription. c. mRNA transcript processing. d. translation. e. post-translational processing of proteins
In bacterial cells, the concentration of cAMP is _______ correlated with the sugar _______.
A: negatively: glucose B: positively; maltose C: positively; lactose D: positively; glucose E: negatively; lactose
A synapse is
A. part of a neuron. B. a space between neurons. C. an enzyme. D. only found in the peripheral nervous system.