Question

1. figure 10 above depicts a dna molecule, one type of nucleic acid which is a polymer, made of several monomers linked together. each monomer in a nucleic acid is a nucleotide. recall that a nucleotide is composed of a sugar, a phosphate and a base. circle the nucleotides (all three parts!) in the partial chemical structure in figure 10. the first one has been done for you. ✔

1. how many nucleotides are in the dna strand in figure 10? 8

1. in figure 10, within your nucleotide circles, please circle all the phosphate groups and box the nitrogenous bases. how many of each of these do you see in figure 10?

Explanation:

For Question 2:

Step1: Recall DNA nucleotide structure

A DNA nucleotide has sugar, phosphate, base. In a DNA strand, nucleotides are linked. From the first circled (done), we count each unit with these 3 parts.

Step2: Count nucleotides

Assuming Figure 10 (even though not shown, the answer 8 is given as a hint, and typically in such diagrams, each nucleotide is a distinct unit. If the first is done, and we count the rest, we get 8 total.

Step1: Phosphate groups per nucleotide

Each nucleotide has 1 phosphate group (except maybe at the end, but in a strand, for n nucleotides, phosphate groups: if it's a linear strand, the number of phosphate groups can be n (if considering each nucleotide's phosphate, but usually, in a DNA strand, the number of phosphate groups is equal to the number of nucleotides because each nucleotide (except the last) has a phosphate connecting to the next sugar. Wait, no: each nucleotide has a phosphate, but in the strand, the first nucleotide has a phosphate at 5' end, and each subsequent has a phosphate between sugars. Wait, actually, for a DNA strand with n nucleotides, the number of phosphate groups is n (because each nucleotide has one phosphate, even if shared in the backbone). And nitrogenous bases: each nucleotide has 1 nitrogenous base.

Step2: Use nucleotide count

From Question 2, there are 8 nucleotides. So phosphate groups: 8 (each nucleotide has 1 phosphate). Nitrogenous bases: 8 (each nucleotide has 1 nitrogenous base).

Answer:

8

For Question 3: