In B-DNA

question 6

Multiple Choice

In B-DNA

• A)the width of the base pair varies depending on the bases involved.
• B)the base planes are rotated approximately 90^° from the axis of the helix.
• C)the sugar pucker must be variable depending on the base attached.
• D)the helix twist is approximately 10^° per base pair.
• E)all of the above

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Definitions:

Element

A substance consisting of atoms which all have the same number of protons, fundamentally the simplest substances that cannot be broken down using chemical methods.

Isotope

Variants of a particular chemical element that differ in neutron number, and consequently in nucleon number, but have the same number of protons.

Protons

Positively charged particles located in the nucleus of an atom, contributing to the atom's mass and charge.

Isotope

Atoms of the same element with the same number of protons but different numbers of neutrons, leading to different atomic masses.