Sidney Brenner argued that the code was nonoverlapping because he considered that coding restrictions would occur if it were overlapping. A second major argument against an overlapping code involved the effect of a single nucleotide change
In an overlapping code, how many adjacent amino acids would be affected by a point mutation? In a nonoverlapping code, how many amino acid(s) would be affected?
two; one
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Cholesterol functions in the plasma membrane to
A. transport ions. B. serve as an energy molecule. C. maintain fluidity. D. mediate steroid action. E. maintain hypertension.
Which of the following describes a feature of amino acid structure?
A. The central or ?-carbon of the amino acid is bonded to three other groups. B. Each amino acid will have either an ?-amino group or an ?-carboxyl group. C. The R groups of amino acids will vary in structure, size, electrical charge, and hydrophobicity. D. The ?-amino and ?-carboxyl groups are frequently modified by phosphorylation. E. In most cases, the central or ?-carbon of the amino acid is bonded directly to a hydroxyl group.
What was the energy source in the Miller-Urey simulation of conditions on the early Earth?
What will be an ideal response?
On a specific chromosome, an enhancer helps activate the expression of Gene A, but not Gene B, which is equally close to the enhancer. A mutant is identified where this enhancer is now activating the expression of both Gene A and Gene B. Explain what has
likely been mutated. What will be an ideal response?