Question

12. The structure shown to the right
A. is a nucleoside
B. is a nucleotide
C. is a component of DNA
D. is a component of RNA
E. contains a high energy phosphoanhydride bond

Answer 1

That's a nucleotide. A nucleotide has three things:

1. Nitrogenous base
2. Five carbon sugar
3. Phosphate group

Take a look at your picture.

The BLUE part is the nitrogenous base.

The BLACK part is the five-carbon sugar.

The PURPLE part is the phosphate group.

Whenever you have those three parts, you know it's a nucleotide.

Answer 2

But is that not a part of a DNA?

Answer 3

Well yeah, technically it is!

Good point. I don't see why you wouldn't be able to choose both answers.

Nucleotide would be more specific. That's the only way I can figure.

Answer 4

That said, nucleotides are also a part of RNA.

Answer 5

The only thing I know it's not is a nucleoside. Nucleosides don't have that phosphate group. That purple part, in your picture.

Answer 6

This is a bit of a tricky question - I would like to draw your attention to the 2' carbon on the ribose ring. You will see it has a hydroxyl (OH) group on it, just like it's neighbouring carbon on the 3' carbon. This means it's a part of RNA rather than a part of DNA (the deoxy part of DNA means the 2' carbon has a hydrogen on rather than a hydroxyl group). The structure is also a nucleotide because it has a ribose ring, a nitrogenous base and a phosphate. Without the phosphate it would be a nucleoside as the interestingly named InYourHead stated. Here's a good webpage which should help you sort all this nomenclature out:
http://en.wikipedia.org/wiki/Nucleotide

Answer 7

Nucleosides differ from nucleotides in that they lack phosphate groups.
http://www.blc.arizona.edu/molecular_graphics/dna_structure/dna_tutorial.html

the answer is D