Chapter 2 (Biological Molecules) F.Sc 1st Year Short Questions

What are the subunits of a typical nucleotide?

Each nucleotide is made of three subunits:

  • a 5-carbon monosaccharide (a pentose sugar)
  • a nitrogen-containing base
  • a phosphoric acid

What pentose sugar is found in nucleotides? (OR How ribonucleotide and deoxyribonucleotide differ in having pentose sugar?)

Pentose sugar in ribonucleotide is ribose, while in deoxyribonucleotide it is deoxyribose (one oxygen removed from OH group at carbon number

What nitrogenous bases are present in nucleic acids?

Nitrogenous bases are of two types:

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

  • single-ringed pyrimidines
  • double-ringed purines

Pyrimidines are cytosine (abbreviated as C), Thymine (abbreviated as T), and uracil (U). Purines are adenine (A) and guanine (G).

What is the position of attachment of nitrogenous base and phosphoric acid to pentose sugar in a typical nucleotide?

In a typical nucleotide the nitrogenous base is attached to position 1 of pentose sugar, while phosphoric acid is attached to carbon at position 3 of pentose sugar.

Differentiate between nucleoside and nucleotide.

The compound formed by combination of a base and a pentose sugar is called nucleoside while a nucleoside and a phosphoric acid combine to form a nucleotide.

Subscribe to brighten your future

An email was just sent to confirm your subscription. Please find the email and click 'Confirm Follow' to start subscribing.

Leave a Reply

Your email address will not be published. Required fields are marked *