How is the structure of the lac repressor protein reflected in the operator sequence to which it binds?
What will be an ideal response?
Ans: The operator sequence has dyad symmetry, reflecting the identical nature of the subunits that make up the repressor and the fact that each dimer in a repressor tetramer binds to an operator (with a monomer contacting each half-site).
You might also like to view...
Chromosomal islands are presumed to have a "foreign" origin based upon three observations. What are these observations and how do they indicate that chromosomal islands are "foreign" in origin?
What will be an ideal response?
Light entering a human eye travels through structures in this order:
A. cornea, aqueous humor, pupil, lens, vitreous humor, retina. B. sclera, cornea, lens, aqueous humor, iris, vitreous humor, retina. C. aqueous humor, iris, pupil, lens, vitreous humor, retina. D. lens, cornea, vitreous humor, pupil, iris, aqueous humor, retina.
Which of the following are functions of the stomach?
A) digestion of proteins B) control movement of food into the small intestine C) storage of food D) absorption of protein and carbohydrates
Arthropods typically serve as which mechanism of transmission for viruses?
A) biological vector B) fomite C) mechanical vector D) both as fomites and as vectors