Test: Nature of Bond Linking Monomers - ACT MCQ

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.

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.

• Glucose, fructose, galactose and ribose are all monosaccharides.
• The monosaccharide contained in nucleic acid is ribose and deoxyribose.
• They are pentose sugars.
• Ribose sugar is present in RNA while deoxyribose sugar is present in DNA.

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.