Biology Grade 12 Evaluation

The diagram shows a high-power drawing of a bacterium.

Which three components are found in both this bacterium and an animal cell?

• capsule, cell membrane and cell wall

• capsule, DNA and ribosomes

• cell membrane, cell wall and DNA

• cell membrane, DNA and ribosomes

Which of the following is true of all enzymes.

Table on the diagram

• A

• B

• C

• D

The image to your left shows two solutions separated by a partially permeable membrane.

Which statement is true about the image above?

• There is no net movement of water from W to X

• There would be movement of water molecules from W to X

• Osmosis of sugar molecules would occur from the dilute solution (W) to the concentrated solution (X)

• Solution X is more dilute and therefore has higher water potential than solution W.

Which of the following is a polysaccharide present in human muscles?

• Amylose

• Collagen

• Glucogen

• Haemoglobin

   State the appropriate units for measuring diameters of alveoli, diameters of white blood cells and the width of cell walls?

• A

• B

• C

• D

One of these is the level of protein structure that is demonstrated by a hemoglobin molecule?

• A

• B

• C

• D

A student carried out a test for biological molecules on a solution. The observations are shown on the table.

Which of the following molecules will be present in the solutions?

• Glucose, starch, protein

• Lipid, protein, glucose

• Protein, starch, sucrose

• Starch, protein, lipid

Which of the following is true about the optimum temperature of all enzymes?

 

1. It is the temperature at which the enzymes work best

2. It is the highest temperature at which the enzyme will work

3. It is between 35°C and 40°C

• 1 and 2

• 2 and 3

• 1

• 3

Which of the following processes allows the movement of molecules that are too large to enter the cell surface membrane?

• Endocytosis

• Exocytosis

• Active transport

• Diffusion

The diagram represents a cell surface membrane.

Three pathways through the membrane are shown.

Which one of these represents each arrow?

• A

• B

• C

• D