Which of the following statements about the
electromagnetic spectrum is true?
a. Infrared energy is sufficient to produce
ionization.
b. Infrared radiation has more energy than red
radiation.
c. Visible light has more energy than
ultraviolet radiation.
d. Chlorophyll absorbs some visible
wavelengths, but not all.
e. Chloroplasts absorb all wavelengths of
visible light equally.
D
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Imagine you conduct a parabiosis experiment with two strains of mice, one of which lacks a functional leptin gene (ob strain) while the other lacks a functional receptor for this hormone (db strain). Which of the following outcomes would you observe?
A. no weight change in the ob mouse B. no weight change in the db mouse C. increased body weight in the ob mouse D. decreased body weight in the ob mouse E. decreased body weight in the db mouse
Facilitated diffusion is specific. This means ____
a. a specific protein will transport certain polar or charged molecules but not others b. that only one specific integral protein per membrane is involved in facilitated diffusion c. that the energy molecule ATP is specifically required for transport d. only specific hydrophobic molecules can be transported e. that transport of molecules occurs only in specific cells
A specific type of reproduction in which a new organism is an outgrowth of the parent is
A. budding. B. fragmentation. C. cloning. D. sexual.
Histone deacetylase inhibitors are a class of drugs used as mood stabilizers and anti-epileptics that are also being researched for their efficacy as anti-cancer agents. Histone deacetylase inhibitors block the action of histone deacetylases, which remove acetyl groups from lysine residues in histone tails. How will blocking histone deacetylases affect gene expression in the cell?
A. Chromatin will become more tightly compact, and gene expression will be increased. B. Chromatin will become more tightly compact, and gene expression will be reduced. C. Chromatin will become more methylated, and gene expression will be decreased. D. Chromatin will become more open, and gene expression will be increased. E. Chromatin will become more open, and gene expression will be reduced.