Since viruses have no active methods of entering plant cells, they must rely upon mechanically caused wounds, vegetative propagation of plants, grafting, seed, pollen, and being carried on the mouth parts of chewing insects. Tobacco mosaic virus is most commonly introduced into plants through small wounds caused by handling and by insects chewing on plant parts. What would prevent viruses from easily entering plant cells?
a. The cell wall on the virus
b. The plasma membrane on the plant
c. The cell wall on the plant
d. The plasma membrane on the virus
e. The protein coat on the virus
Answer: c. The cell wall on the plant
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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 reduced. B. Chromatin will become more tightly compact, and gene expression will be increased. C. Chromatin will become more open, and gene expression will be reduced. D. Chromatin will become more open, and gene expression will be increased. E. Chromatin will become more methylated, and gene expression will be decreased.
Bladders on kelp function to anchor the thallus to the substrate
Indicate whether the statement is true or false
What organic compound was widely used as a
rat poison until 1980?
a. warfarin b. amygdalin c. linamarin d. cyanide e. myristicin
Gamete formation is
a. the result of the process of mitosis. b. the pairing of homologous chromosomes. c. the formation of sex cells. d. the fusion of gametes. e. a process that occurs only in asexually reproducing forms