What statement below characterizes pigments’ function?
a. They absorb some photons.
b. They reflect all photons.
c. They absorb photons of all colors.
d. They absorb photons of all wavelengths.
e. They absorb ultraviolet wavelengths.
ANSWER: a
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Which of the following is not a role for methylation?
A. Methylation can protect bacterial RNA from restriction enzymes that are used to destroy viral DNA. B. Methylation of DNA can act as an inhibitor of gene expression. C. Methylation of DNA can enhance binding of certain proteins. D. Methylation is important in directing mismatch repair to repair the correct DNA strand. E. Methylation in eukaryotes can affect the formation of Z-DNA.
Most of the organs of the human body, for example the heart and lungs, are found in the posterior cavity, which is divided into the thoracic and abdominal regions.
a. true b. false
New genes are introduced into a gene pool by
A. evolution. B. spontaneous mutations. C. natural selection. D. inheritance of acquired characteristics.
Answer the following questions true (T) or false (F)
1. Some bacterial cells are resistant to a variety of antimicrobials because they actively pump the drugs out of the cell. 2. The outer membrane of Gram-negative bacteria enables many antimicrobial drugs to enter the cell more easily. 3. If a subculture of an MIC test grows in an MBC test, the concentration of the drug was bactericidal.