Which of the statements describes purines and pyrimidines in DNA molecules? (Pick more than one) Pyrimidines...

Which of the statements describes purines and pyrimidines in DNA molecules? (Pick more than one)

Pyrimidines consist of a one-ring structure.

Pyrimidines form hydrogen bonds with purines.

Pyrimidines form covalent bonds with purines.

Adenine and guanine are pyrimidines.

Purines form hydrogen bonds with purines.

Expert Solution

Nitrogenous bases in DNA :-
• Two types of nitrogenous bases are found in nucleic acids - purine and pyrimidines.

Purines -
• Adenine and guanine are purine nitrogenous bases.
• Purines have two rings in their structure, one ring with six carbons and other one with five carbons.

Pyrimidines -
• Thymine and cytosine are pyrimidine nitrogenous bases found in DNA.
• Pyrimidines have one ring in their structure with six carbons.

For a double stranded DNA -
• One purine base always forms hydrogen bonds with pyrimidine base.
• Adenine forms triple hydrogen bonds with thymine and guanine forms triple hydrogen bonds with cytosine. This type of arrangement is responsible for constant diameter of double stranded DNA.

Now, in question.
Correct options are -
• Pyrimidines consist of a one-ring structure.

• Pyrimidines form hydrogen bonds with purines.

**Nitrogenous bases form covalent bond with sugar molecule in DNA. No covalent bonds found between nitrogenous bases.

gladiator answered 1 year ago

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