3N SciBio EOY MCQ

The diagram shows part of a plant cell.

 

Which part controls the movement of substances into and out of the cell?

• A

• B

• C

• D

Which organelle is not correctly paired with its function?

 

 

• A

• B

• C

• D

The diagram shows the cross-section of a specialised cell.

What description of this cell is not correct?

 

• It has biconcave shape to increase the surface area to volume ratio for diffusion of oxygen.

• It contains haemoglobin to bind to oxygen.

• It does not contain a nucleus to pack more haemoglobin.

• It has a low water potential to allow easy diffusion of oxygen.

A human red blood cell is placed in a concentrated salt solution.

 

Which row is correct?

• A

• B

• C

• D

A student cuts out four cylinders of potato, each measuring 30 mm long with identical diameter.

 

The potato cylinders are placed in sugar solutions of different concentrations. After one hour, the lengths of the cylinders are measured again. The results are shown in the following table.

 

Which sugar solution has a water potential closest to that of the potato cell sap?

• A

• B

• C

• D

A Visking tubing was immersed into a liquid in a boiling tube. The Visking tubing and boiling tube were weighed separately before the experiment.

 

After half an hour, the Visking tubing was removed and both were weighed again.

 

Which row best describes the results?

• mass of tubing: decreased

  mass of boiling tube: increased

• mass of tubing: decreased

  mass of boiling tube: remained the same

• mass of tubing: increased

  mass of boiling tube: decreased

• mass of tubing: remained the same

  mass of boiling tube: remained the same

Before a marathon, athletes usually eat bananas.

 

What is the main nutrient in bananas that sustain athletes?

• carbohydrate

• fat

• fibre

• protein

A student drew three pictorial representation of biological molecules P, Q and R.

Which row is correct?

• P: fat

  Q: polypeptide

  R: starch

• P: polypeptide

  Q: starch

  R: protein

• P: glycogen

  Q: starch

  R: fat

• P: starch

  Q: polypeptide

  R: fat

A food sample is tested with three reagents. The results of the test are:

·       Iodine solution turns blue-black.

·       Biuret test turns violet.

·       Ethanol test gives a colourless solution.

 

Which nutrients are present in the food?

• A

• B

• C

• D

The diagram shows the enzyme reaction of protease.

Which row correctly identifies P, Q and R?

• P: protease

  Q: protein

  R: amino acid

• P: protease

  Q: amino acid

  R: protein

• P: protein

  Q: protease

  R: amino acid

• P: amino acid

  Q: protease

  R: protein