G10 GEN EOT 1 Biology Revision

Which of the following is the molecule that the enzyme specifically acts on?

• Catalyst

• Coenzyme

• Metalloid

• Substrate

The graph below shows the rate of the action of a certain enzyme for different pH values. Which of the following is the optimal pH of this enzyme?

• 4

• 5

• 9

• 13

Which of the following is the mechanism through which enzymes increase the speed of chemical reactions?

• Decreasing the concentration of reactants

• Increasing the temperature of the cell

• Raising the number of products

• Reducing the activation energy

Which of the following is the type of bond that can be found between two water molecules?

• Covalent bond

• Hydrogen bond

• Ionic bond

• Peptide bond

Based on the diagram below, which end of the water molecule has a slightly positive charge?

• Both hydrogen and oxygen ends

• Hydrogen end

• Neither end is slightly positive

• Oxygen end

Which of the following terms is used to describe the attraction of water molecule to other substances, such as the walls of plant tubes?

• Adhesion

• Cohesion

• Solubility

• Surface tension

Which of the following explains why oil and water do not mix?

• Both are liquids and liquids do not mix

• Both have the same charge so they repel each other

• Oil is less dense than water

• Oil is nonpolar and cannot dissolve in the polar water

Which of the following are among the major groups of biological macromolecules?

• Aromatic hydrocarbons

• Carbohydrates

• Polyethylene compounds

• Silicates

Which of the following molecules is a nucleic acid?

• DNA

• Enzyme

• Steroid

• Sugar

Which of the following is most likely the type of the molecule shown in the diagram?

• Amino acid

• Nucleotide

• Phospholipid

• Sugar