Question

In studying a virus, you find the following proportions of nitrogenous bases present; Adenine 23%, Guanine 27%, Cytosine 27%. Uracil 23%. Which of the following statement(s) regarding this virus is/are correct? (I) It probably uses RNA as its genetic material. (II) The genetic material of this virus is probably single stranded (III) The genetic material of this virus is probably double stranded (IV) Base pairing rule in the virus include Adenine: Uracil​

Answer 1

Answer:

These 3 statements are correct-

I) It probably uses RNA as its genetic material, as uracil is present.

III) The genetic material of the virus is probably double stranded, as %of purine = % of pyrimidiene.

IV) Base paring rule in the virus include Adenine : Uracil, as a adenine and uracil pairs with each other through a double bond in double stranded RNA.

hope this will help you

Answer 2

Genetic  material of this virus is double standard RNA

Explanation:

Purines and Pyrimidines

• Hydrogen bonds are formed between DNA strands by nitrogenous bases called purines and pyrimidines. The purines in DNA are the same as those in RNA that is adenine and guanine.
• In DNA, the pyrimidines are thymine and cytosine, and the pyrimidines in RNA are thymine and uracil.
• According to base pairing, adenine pairs with thymine, and cytosine pairs with guanine in DNA.In RNA, adenine pairs with uracil and cytosine pairs with guanine

Chargaff rule :

• The ratio of pyrimidine and purine nucleotides in DNA in any organism's cell is 1:1. The amount of guanine should be equal to cytosine, and the amount of adenine should be equal to thymine, according to this rule. It can be used with two-stranded molecules like DNA.
• As a result, this rule holds for DNA as well as some double-stranded RNA

Three statement are correct from the above question is as follows:

1. It probably uses RNA as its genetic material

• In this virus, the nitrogenous base is uracil instead of thymine. So, it is RNA.

2. The genetic material of this virus is probably double stranded

• From the above question, it is clear that the percentage of adenine is equal to percentage of uracil and the percentage of guanine is equal to cytosine

3. Base pairing rule in the virus include Adenine: Uracil​

• The genetic material of virus is double standard RNA. According to base pair, In RNA, nitrogenous base adenine pairs with uracil