Which of the following is a critical region of a tRNA molecule? (choose all that apply)
A. amino acid attachment site
B. anticodon loop
C. stop codon
D. aminoacyl site
E. ribosome binding site
Answer: A,B
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Biological molecules with dipole moments:
A. are typically called nonpolar molecules. B. are typically called polar molecules. C. are found in environments in which they can interact with other nonpolar molecules. D. always display resonance. E. also have no single electrons in their outer valence shell.
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.
Which of the following affects the acid-base balance of extracellular fluid?
a. kidneys only b. respiratory system only c. all of the choices d. buffering systems only
Monoclonal antibodies are useful in treating cancer when radioactive materials or tumor-killing drugs are attached to them. How is it that these cancer-killing methods are delivered only to the tumor and not to other, healthy cells?
A) Antibodies will stimulate the actions of T helper cells to fight the cancer. B) Antibodies will attach to any cancer cell found, even if there are several different types present. C) Antibodies will stimulate the actions of cytotoxic T cells to fight the cancer. D) Antibodies will specifically bind to the antigen target for which they are designed, here a cancer cell.