Cell Structure & Organelles MCQs with Answers

The point where the enzyme is most active is known as ?

• A.Optimum pH
• B.Optimum temperature
• C.Activation energy
• D.None of these

The linkage between substrate molecule and active site is?

• A.Hydrogen bonding
• B.Covalent bonding
• C.Ionic bonding
• D.Metallic bonding

Which of the following is the stage of meiosis during which pairs of homologous chromosomes align at the centre of cells?

• A.Metaphase I
• B.Prophase I
• C.Anaphase I
• D.Telophase I

Which theory of aging suggests that free radicals cause damage to body cells?

• A.Wear and tear theory
• B.Telomere shortening theory
• C.Programmed aging theory
• D.Free radical theory

The general name for an enzyme that transfers phosphate groups from ATP to a protein is ?

• A.Phosphatase
• B.Protein kinase
• C.Protease
• D.Ligase

All are factors affecting enzyme activity except?

• A.Temperature
• B.pH
• C.Organic solvent
• D.Substrate concentration

During cellular respiration NADH2 produces ?

• A.2 ATP
• B.4 ATP
• C.3 ATP
• D.5 ATP

Each enzyme works best with maximum catalytic activity at a specific temperature called as _?

• A.Optimum Temperature
• B.Critical Temperature
• C.Absolute Temperature
• D.Activation Temperature

The fluid mosaic model refers to the structure of the membrane of which type of cells?

• A.Prokaryotic cells only
• B.Eukaryotic cells only
• C.Both prokaryotic and eukaryotic cells
• D.Plant cells only

Stage of meiosis in which centromeres shorten and the paired chromatids are pulled away from one another?

• A.Anaphase-I
• B.Anaphase-II
• C.Metaphase-II
• D.Telophase-I