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

Biology & Microbiology

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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.

Biology & Microbiology

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?

Biology & Microbiology

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.

Biology & Microbiology

What was the energy source in the Miller-Urey simulation of conditions on the early Earth?

What will be an ideal response?

Biology & Microbiology