Which of the following occurs during alternative RNA splicing?
a. Multiple protein products are produced by one gene.
b. An enzyme replaces an RNA primer with a DNA nucleotide.
c. DNA is uncoiled and loosened from nucleosomes.
d. RNA is transcribed and translated into protein.
a. Multiple protein products are produced by one gene.
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In the alveoli
A. oxygen diffuses into the blood while carbon dioxide diffuses out of the blood. B. oxygen diffuses out of the blood while carbon dioxide diffuses into the blood. C. both oxygen and carbon dioxide diffuse out of the blood. D. both oxygen and carbon dioxide diffuse into the blood. E. no exchange with the blood occurs.
Rubisco is necessary for
a. capturing light energy. b. carbon cycling. c. producing chlorophyll. d. water absorption.
A molecular clock is based on
a. measurement of daylength by pigment complexes. b. daily changes in amino acid sequence in specialized proteins. c. regulation of the order in which genes are turned on. d. precise oscillations of atoms in a crystal. e. a constant rate of mutation in DNA sequences.
It is inappropriate to prescribe antibacterial agents to treat colds or flu because
A) the microbes involved can develop resistance rapidly. B) these diseases are transmitted by endospores, which are difficult to kill. C) these diseases exhibit cross resistance. D) these diseases are caused by viruses. E) these diseases can act synergistically with each other.