Question

question 7 (5 points)
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adenine (a) thymine (t)
the dotted lines between the two bases shown are representative of what kind of bonding?
a) dipole - to - dipole bonding
b) covalent bonding
c) hydrogen bonding
d) ionic bonding

Explanation:

To determine the bonding between adenine (A) and thymine (T) (DNA bases), we analyze each option:

• Option A: "Dipole - to - dipole bonding" is not the correct term for this interaction. The specific interaction here is hydrogen bonding, not a general dipole - dipole.
• Option B: Covalent bonding involves sharing electrons between atoms. The dotted lines here do not represent electron - sharing between A and T (they are between different molecules/parts, and covalent bonds are within a molecule for these bases’ backbones, not between the bases).
• Option C: Hydrogen bonding occurs when a hydrogen atom (bonded to a highly electronegative atom like N or O) is attracted to another electronegative atom (N, O, F). In A - T pairing, H from A (bonded to N) interacts with O from T, and H from T (bonded to N) interacts with N from A, which fits hydrogen bonding.
• Option D: Ionic bonding involves transfer of electrons and attraction between ions. There are no ions here, so this is incorrect.

Answer:

C) Hydrogen bonding