The terminator versus anti-terminator function of the T box-based riboswitch used by Gram-positive bacteria to regulate amino acid-related genes is determined by ________.
A. the binding of the appropriate uncharged tRNA
B. the rate of leader peptide synthesis
C. the utilization of the appropriate sigma factor by RNA polymerase
D. the binding of the T box binding protein
Answer: A
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DNA-binding proteins interact predominantly within which portion of a double-stranded DNA helix?
A) major groove B) minor groove C) 3' end D) supercoil
All of the following are a form of potential energy that can be used by a cell EXCEPT
A. an electrical/ion gradient. B. NADH. C. ATP. D. concentration gradient. E. nitrogen.
Many bacteria facilitate the uptake of iron by secreting low molecular weight molecules, called ________, to form complexes with the iron that can then be readily transported into the cell.
Fill in the blank(s) with the appropriate word(s).
Water has the ability to dissolve salts and carry dissolved carbon dioxide. How does this action help the human body maintain homeostasis?
A) production of energy for cells B) distribution of needed materials to the cells C) removal of waste from the cells and the body D) absorption of needed materials from the environment