Its A directional because <span>In directional selection, selection pressures favor an extreme, in this case, short </span>plants<span>.tall</span>
In terms of sequence variation, the one that is least like the others is SNP. Option A
<h3>What is sequence variation?</h3>
Generally, The word "genetic variety" refers to the variance in the DNA sequence in each of our genomes.
In conclusion, SNP is the only none structural variation, which involves above one base twin in variation, whereas SNP only shows variation in a single base pair.
Read more about Mutation
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The answer (although it appears to be missing a word or two) is:
C) The cell would have to take in and use (energy, resources) in order to break the covalent bonds.
Covalent bonds are more difficult to break/create than hydrogen bonds, and thus require more energy. The advantage of hydrogen bonds to connect base pairs in a DNA strand is the ease with which they can be broken and then connect again, sort of like a zipper. The same process with covalent bonds would be more like unbuttoning and re-buttoning a shirt, it is slower and requires more energy to accomplish.
Extra sugar that a plant doesn't need is stored as starch. Using a tree as an example, it uses photosynthesis to create sugar and the rest that remains unused is stored in the trunk or roots as starch, saved for later.