Biomolecules for NEET UG
Living cells are made of a few kinds of large molecules: carbohydrates, proteins, lipids and nucleic acids. Enzymes, a special class of proteins, run almost every reaction in the cell.
BiologyClass 1187 MCQs2 lessons12 flashcards3 memory tricks
What you'll learn
- Building blocks: monomers and polymers
Match each biomolecule to its building block and bond. - Enzymes
Explain how enzymes work and how temperature, pH and inhibitors affect them.
Memory tricks
Oxidoreductases, Transferases, Hydrolases, Lyases, Isomerases, Ligases.
Malonate resembles succinate and blocks the active site of succinic dehydrogenase. Adding more substrate can overcome competitive inhibition.
Primary: amino acid sequence. Secondary: α-helix, β-sheet. Tertiary: 3D folding. Quaternary: several chains, e.g. haemoglobin (2α + 2β).
Try 3 NEET-style questions
Q1. Given below are two statements. Statement I: Cellulose is a homopolymer of glucose. Statement II: Coenzymes are tightly and permanently bound to the apoenzyme. In the light of the above statements, choose the correct answer.
- Statement I is true but Statement II is false
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is false but Statement II is true
Show answer
Answer: (1) Statement I is true but Statement II is false
Statement I is true: cellulose is made of glucose units only. Statement II is false: coenzymes associate only transiently; prosthetic groups are the tightly bound ones.
Q2. The bond formed between the carboxyl group of one amino acid and the amino group of the next, with loss of water, is a
- glycosidic bond
- phosphodiester bond
- peptide bond
- hydrogen bond
Show answer
Answer: (3) peptide bond
Amino acids join by peptide bonds through a dehydration reaction.
Q3. Concanavalin A, a secondary metabolite, is an example of a
- toxin
- lectin
- alkaloid
- pigment
Show answer
Answer: (2) lectin
Concanavalin A is a lectin (a carbohydrate-binding protein).
Practise all 87 questions Free · explanations for every option · see where you go wrong