Cell Structure & Organelles MCQs with Answers

Which of the following is thought to participate in the regulation of animal cell behavior by communicating information from the outside to the inside of the cell?

• A.Glycoproteins
• B.Integrins
• C.Phospholipids
• D.Cholesterol

Trace the correct pathway of protein produced from protein factories.

• A.Lysosome → Golgi body → RER → Ribosomes
• B.RER → Ribosomes → Lysosome → Golgi body
• C.Golgi body → RER → Ribosomes → Lysosome
• D.Ribosomes → RER → Golgi body → Lysosome

The cyclin component of MPF is destroyed toward the end of which phase?

• A.G1 phase
• B.S phase
• C.M phase
• D.G2 phase

Activity of enzymes can be enhanced by ?

• A.Reducers
• B.Inhibitors
• C.Coagulants
• D.Activators

Which of the following statement is incorrect regarding rate of enzymatic action?

• A.Increase in enzyme concentration reduces the rate
• B.Increase in substrate concentration increases the rate up to a limit
• C.Increase in temperature increases the rate up to an optimum level
• D.Optimum pH is required for maximum rate of enzymatic action

Do anabolic reactions require energy?

• A.Yes, they require energy input
• B.No, they release energy
• C.No, they neither require nor release energy
• D.Yes, but only in plants

Enzyme activity decreases at very low or high pH because?

• A.Enzymes become denatured
• B.Enzymes become more active
• C.Enzymes change their substrate specificity
• D.Enzymes multiply rapidly

Enzymes are made of _?

• A.Carbohydrates
• B.Lipids
• C.Proteins
• D.Nucleic Acids

Reversible inhibitors affect the enzyme catalyzed reaction by?

• A.Irreversibly blocking the active site
• B.Forming strong covalent bonds with enzymes
• C.Permanently destroying the enzyme structure
• D.Forming weak linkages with enzymes

The activated enzyme consisting of polypeptide chain is called ?

• A.Apoenzyme
• B.Holoenzyme
• C.Coenzyme
• D.Prosthetic group