STPM Biology 2015 Term 1 MCQ

Which property of water enables it to act as a biological lubricant?

• Water is a liquid at room temperature.

• Water has a high surface tension.

• Water is a polar molecule.

• Water has a low viscosity.

Which sugar does not react with copper (II) sulphate solution to produce copper (I)

oxide?

• Fructose

• Lactose

• Maltose

• Sucrose

Which product will be produced after the protein is organised?

• Keratin

• Fibroin

• Protease

• Collagen

The structure of initiator tRNA is shown in the diagram. Choose the correct answer.

• A

• B

• C

• D

Which characteristic determines bacteria as prokaryotes?

• The DNA is linear.

• The DNA has no ends.

• The DNA forms a complex with histones.

• The DNA is surrounded by specific membrane.

In mitochondria, the pH of the intermembrane space is lower than that of the matrix due

to the ______.

• high production of ATP

• high concentration of H⁺ due to chemiosmosis

• high concentration of pyruvic acid in the matrix

• accumulation of lactic acid during anaerobic respiration

The longitudinal section of a plant stem is shown. Which tissue is shown by this micrograph?

• Xylem

• Phloem

• Collenchyma

• Sclerenchyma

When an animal cell is placed in distilled water, the cell will _______.

• undergo lysis

• remain unchanged

• undergo crenation

• undergo plasmolysis

Penicillin blocks the formation of bacterial wall by mimicking substrate for the enzyme

transpeptidase. Which is true of penicillin?

• It forms a complex with the substrate.

• It binds to the allosteric site of the enzyme.

• It blocks the substrate from entering the active site.

• It destroys the three dimensional configuration of the enzyme.

Which is true about a non-competitive inhibitor?

• It changes the conformation of enzyme.

• It binds to the active site of the enzyme.

• It increases the K_M value of the reaction.

• It depends on the relative concentration of substrate.