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

Give the characters of globular proteins, or What are globular proteins?

  • These are spherical or ellipsoidal due to multiple folding of polypeptide chains.
  • Tertiary structure is most important in them.
  • They are soluble in aqueous media such as salt solution, solution of acids or bases, or aqueous alcohol.
  • They can be crystallized
  • They disorganize with changes in the physical and physiological environment.

Give examples of globular proteins.

Examples are enzymes, antibodies, hormones and haemoglobin.

From which cells nucleic acids were isolated?

Nucleic acids were first isolated in 1870 by an Austrian physician Friedrich Miescher from the nuclei of pus cells.

Why nucleic acids are give that name?

Due to their isolation from nuclei and their acidic nature, they were named re nucleic acids.

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How many types of nucleic acids are there?

Nucleic acids are of two types, deoxyribonucleic acid or DNA and ribonucleic acid or RNA.

What is the effect of room temperature on fats?

Fats containing unsaturated fatty acids are usually liquid at room temperature and are said to be oils. Fats containing saturated fatty acids are solids. Animal fats are solid at room temperature, whereas most of the plant fats are liquid.

What is the specific gravity of fats and oils?

Fats and oils have a specific gravity of about 0.8.

What is the chemical nature or composition of waxes? or what are waxes?

Chemically, waxes are mixtures of long chain alkanes (with odd number of carbons ranging from C25 to C35) and alcohols, ketones and esters of long chain fatty acids.

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