Test: Nature of Bond Linking Monomers


5 Questions MCQ Test Biology Class 11 | Test: Nature of Bond Linking Monomers


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QUESTION: 1

An ester bond is present between

Solution: Phosphodiester bond definition. A bondbetween a two sugar groups and a phosphate group; such bonds form the sugar-phosphate-sugar backbone of DNA and RNA. A diester bond (between phosphoric acid and two sugar molecules) linking two nucleotides together to form the nucleotide polymers DNA and RNA.
QUESTION: 2

A peptide bond is formed by the process of

Solution:

A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H2O). This is a dehydration synthesis reaction (also known as a condensation reaction), and usually occurs between amino acids.

QUESTION: 3

Which bond is present between adjacent glucose units in polysaccharides?

Solution:

The correct option is Option D.
In a polysaccharide, two glucose units are joined by a glycosidic bond. This bond is formed by the process of dehydration.
An ester bond is present in a nucleotide between a phosphate and a pentose sugar molecule.
Peptide bonds are present between successive amino acids in a protein molecule.
Hydrogen bonds are present between nucleotides on the opposite strands of a DNA molecule.

QUESTION: 4

Glycylalanine contains

Solution:

"Dipeptide glycylalanine contains glycine as N-terminal residue.

A dipeptide is a natural compound derived from two amino acids. The amino acids can be different or the same.

When different, two isomers of the dipeptide are feasible, depending on the sequence. Similar descriptions apply to tripeptide (three amino acid residues, two peptide bonds), tetrapeptide, and so forth, longer chains are known as oligopeptide, polypeptide, and protein."

QUESTION: 5

In a DNA molecule, two strands are held by

Solution:

By hydrogen bonds between the two bases. Basically, the bases are ‘polar’, meaning they have slight differences in electrical charge at certain points. This allows them to attract one another like a balloon sticking to your hair.

Hydrogen bonds are weaker than the covalent bonds that hold the rest of the molecule together, making them easier to break and re-form.

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