Questions: Question 1 (1 point) Analysis of a new virus's genome reveals that it is composed of a double stranded DNA molecule containing 20% T (thymine). Based on this information, what would you predict the percent of G (guanine) to be? 30% 80% 60% It cannot be determined 20% Question 2 (1 point) Is the nucleotide base guanine (G) a purine or a pyrimidine? Purine Pyrimidine

Let's address each question one by one.

Analysis of a new virus's genome reveals that it is composed of a double stranded DNA molecule containing 20% T (thymine). Based on this information, what would you predict the percent of G (guanine) to be?

The answer is $30 \%$.

Explanation:

1. In a double-stranded DNA molecule, the amount of adenine (A) is equal to the amount of thymine (T), and the amount of guanine (G) is equal to the amount of cytosine (C). This is known as Chargaff's rules.
2. Given that the DNA contains 20% thymine (T), it must also contain 20% adenine (A) because A pairs with T.
3. The total percentage of A and T together is 20% + 20% = 40%.
4. Since the total percentage of all four bases (A, T, G, C) must add up to 100%, the remaining percentage for G and C together is 100% - 40% = 60%.
5. Because the amount of G is equal to the amount of C, the percentage of G must be half of 60%, which is 30%.

Is the nucleotide base guanine (G) a purine or a pyrimidine?

The answer is Purine.

Explanation:

1. Nucleotide bases in DNA and RNA are classified into two categories: purines and pyrimidines.
2. Purines have a two-ring structure, while pyrimidines have a single-ring structure.
3. The purines are adenine (A) and guanine (G).
4. The pyrimidines are cytosine (C), thymine (T), and uracil (U) (in RNA).

Summary:

1. The percent of guanine (G) in the virus's genome is 30%.
2. Guanine (G) is a purine.