Most Important Macromolecules MCQs with Answers

The most familiar example of denaturation is the change that takes place in albumin, the principal component of egg white, when it is cooked. In this particular case the change is irreversible.

The secondary structure of a protein is a regular coiling or zigzagging of polypeptide chains caused by hydrogen bonding between NH and C=O groups of amino acids near each other in the chains.

Based on the physico-chemical properties, proteins may be classified into three types: Simple proteins, Compound or Conjugated proteins, and Derived proteins.

Simple proteins like albumins and globulins are found in animals and form some 25 to 35% of body protein.

In these molecules the protein is attached or conjugated to some non-protein groups which are called prosthetic groups.

This class of protein includes substances which are derived from simple and conjugated proteins. For example, proteoses, enzymes, peptones, oligopeptides, polypeptides, etc.

Proteins assume at least three levels of structural organization. Some proteins also possesses a fourth structure called the quaternary structure.

Legumin and collagen proteins are present in the connective tissues throughout the body.

The structure of proteins can be disrupted easily by heat, change in pH and under strongly oxidizing or reducing conditions. Under such conditions the proteins undergo denaturation.

The sequence of the amino acids combined in a peptide chain is referred to as the primary structure.

Proteins take an essential part in the formation of protoplasm which is the essence of all forms of life.

Nucleoproteins which are complexes of proteins with nucleic acids serve as carriers of heredity from one generation to the other.

Enzymes which are biological catalysts are protein in nature.

Many proteins have specialized functions. Haemoglobin acts as a carrier of O₂.

Some proteins act as hormones which have regulatory functions, for example; insulin, thyroxine etc.

Not only the edible fats and oils occupy a place of pride in human diet but they also find use as raw materials for the manufacture of soaps and detergents, paints, varnishes, polishes, cosmetics, printing inks and pharmaceuticals.

Gelatin is obtained by heating bones, skin and tendons in water.

Caesein is another protein used in the manufacture of buttons and buckles.

We are familiar with the use of leather made by tanning of hides. This is essentially a precipitation of the proteins with tannic acid.

Fats and oils are the most important lipids found in nature. They are one of the three major "food factors" needed for human body, the other two being proteins and carbohydrates.

Enzymes which are biological catalysts are protein in nature and play a crucial role in speeding up biochemical reactions in the body.

Haemoglobin acts as a carrier of O₂ (oxygen), implying its ability to bind and release oxygen.

Some proteins act as hormones which have regulatory functions, for example; insulin, thyroxine etc.

Proteins take an essential part in the formation of protoplasm which is the essence of all forms of life.

We are familiar with the use of leather made by tanning of hides. This is essentially a precipitation of the proteins with tannic acid.

Fats and oils are the most important lipids found in nature. They are one of the three major 'food factors' needed for human body, the other two being proteins and carbohydrates.

The text mentions hemoglobin acting as a carrier of O₂ and insulin as a hormone with regulatory functions, both of which are critical for maintaining specific bodily processes and overall homeostasis.

Lipids are naturally occurring organic compounds of animals and plants origin which are soluble in organic solvents like ether, chloroform and benzene, etc. and are insoluble in water.

The primary building blocks of lipids are fatty acids, glycerol and sterols.

The glycerides in which long-chain saturated acid components predominate tend to be solid or semi-solid and are termed as fats. On the other hand, oils are glycerol esters which contain higher proportion of unsaturated fatty acid components.

Marine oils are obtained form sea animals like salmons and whales etc.

Proteins take an essential part in the formation of protoplasm which is the essence of all forms of life.

Nucleoproteins which are complexes of proteins with nucleic acids serve as carriers of heredity from one generation to the other.

Some proteins act as hormones which have regulatory functions, for example; insulin, thyroxine etc.

This is essentially a precipitation of the proteins with tannic acid.

Proteins are mentioned as one of the three major 'food factors' needed for the human body, alongside carbohydrates and fats. This directly implies their nutritional importance for bodily functions, growth, and maintenance.

Enzymes which are biological catalysts are protein in nature.

Enzymes which are biological catalysts are protein in nature.

Enzymes are biological catalysts, meaning they speed up biochemical reactions.

A fundamental characteristic of enzymes is their high specificity.

Enzymes possess specific three-dimensional structures essential for their catalytic activity.

Catalysts lower the activation energy to speed up biochemical reactions.

Tertiary structure defines the active site where catalysis occurs.

Denaturation disrupts protein structure, leading to loss of enzyme function.

Enzymes function effectively within the mild conditions of living organisms.

Enzymes regulate the speed of biochemical reactions in metabolic pathways.

Enzymes are sensitive to pH changes and function within a narrow pH range.

The active site is the region on an enzyme where catalysis occurs.

Catalysts speed up reactions without being consumed; enzymes do this biologically.

An enzyme’s amino acid sequence and 3D structure create its active site and specificity.

Denaturation disrupts the enzyme's structure, causing loss of catalytic activity.