When Ultraviolet Light Strikes DNA,it Can Cause a Specific Type

question 39

Multiple Choice

When ultraviolet light strikes DNA,it can cause a specific type of damage.How is this damage best described?

• A)Thymine bases on the opposing DNA strands are covalently linked together to form a thymine dimer.
• B)Thymine bases on one strand of DNA,next to each other,are covalently linked together to form a thymine dimer.
• C)Adenine and thymine bases on opposing DNA strands are linked together by hydrogen bonds.
• D)Adenine and thymine bases on opposing DNA strands are covalently linked together to form an AT dimer.

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Definitions:

Hole Basis Fit System

A system for fitting where the size of the hole is kept constant and the size of the shaft is varied to obtain different types of fits.

Basic Size

The theoretical or nominal size from which limits of size are determined in machining or manufacturing a piece, serving as a reference for tolerances.

Loose Running Fit

A type of mechanical fit where components can move or rotate freely within each other, used for applications requiring minimal resistance.

Basic Diameter

The theoretical exact diameter of a cylindrical or conical feature as defined in a technical drawing, without any tolerances.