Zoology MCQs for NEET — Practice Questions with Answers

One of the key characteristics of plants is the presence of cellulose and starch. Cellulose is a major component of the plant cell wall, providing structural support. Starch is the primary storage form of carbohydrates in plants, which they use for energy.

Glucose is the most common monomer of carbohydrates. It is a simple sugar (monosaccharide) that serves as a building block for more complex carbohydrates like starch and cellulose. It is a primary source of energy for cells.

Starch is not a disaccharide. Disaccharides are sugars composed of two monosaccharides. Examples include maltose, sucrose, and lactose. Starch, however, is a polysaccharide, which is a complex carbohydrate composed of many monosaccharide units.

The nucleus is the cell organelle that stores the information for synthesizing proteins. It contains the cell's DNA, which has the genetic instructions for protein synthesis. The mitochondria, chloroplast, and cell membrane do not store genetic information.

The statement 'Protein – important compounds of nucleus' is incorrect. Proteins are not the main constituents of the nucleus; nucleic acids (DNA and RNA) are. Proteins have various functions throughout the cell, but they are not specifically the important compounds of the nucleus.

Proteins are made up of amino acids. These amino acids are linked together by peptide bonds to form long chains, which then fold into specific three-dimensional shapes to form proteins. Amino acids are the building blocks of proteins, making option 'o4: Amino acids' the correct answer.

Proteins are primarily composed of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N). Some proteins may also contain sulfur (S) but not phosphorus (P) as a major component. Therefore, option 'o3: They possess C, H, O, N and P in their constitution' is incorrect.

concanavalin A falls under the category of lecitin

Collagen is the most abundant protein in the animal world. It is a structural protein found in connective tissues such as skin, tendons, and bones, providing strength and elasticity. Therefore, option 'o1: Collagen' is the correct answer.

A polypeptide chain of amino acids forms a protein. Proteins are composed of long chains of amino acids linked together by peptide bonds. Each amino acid in the chain is referred to as a residue, and the sequence of these residues determines the protein's structure and function.