Based on the graph of an enzyme-catalyzed reaction, which of the following could be used to increase the reaction rate beyond point C?

  

1. increase the amount of substrate

2. add more water

3. increase the temperature

4. decrease enzyme concentration

Which of the following biomolecules does have a phosphodiester bond?

The chitinous exoskeleton of arthopods is formed by the polymerisation of 

(1) keratin sulphate and chondroitin sulphate

(2) D-glucosamine

(3) N-acetyl glucosamine

(4) lipoglycans

Which of the following is not a polymeric substance?

(1) Nucleic acid               

(2) Proteins

(3) Polysaccharides           

(4) Lipids

A non-proteinaceous enzyme is

A cell organelle containing hydrolytic enzyme is

1. lysosome                         

2. microsome

3. ribosome                         

4. mesosome

Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

Which of the following is the least likely to be involved in stabilising the three-dimensional folding of most proteins?

(1) Hydrogen bonds

(2) Electrostatic interaction

(3) Hydrophobic interaction

(4) Ester bonds

Which of the following describes the graph correctly?

1. Endothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme

2. Exothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme

3. Endothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme

4. Exothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme

Which one of the following statements is wrong?

(1) Cellulose is a polysachharide

(2) Uracil is a pyrimidine

(3) Glycine is a sulphur containing amino acid

(4) Sucrose is a diasaccharide