RnR Biology 1 (MCQ:0654s22)

Which statement about cells is correct?

• Cell membranes are found only in animal cells.

• Cell membranes are found only in plant cells.

• Cell walls are found only in animal cells.

• Cell walls are found only in plant cells.

Which reagent is used to test for the presence of protein in a food sample?

• Benedict’s solution

• biuret

• ethanol

• iodine

Catalase is an enzyme that breaks down hydrogen peroxide to form a foam of water and oxygen. The maximum height of the foam produced at different temperatures in a given length of time is

measured. The rate of the reaction is proportional to the height of foam. The table shows the results.

Which conclusion can be drawn from these results?

• Increasing the temperature decreases the rate of the reaction up to 50 degree Celcius.

• Increasing the temperature decreases the rate of the reaction up to 60 degree Celcius.

• Increasing the temperature increases the rate of the reaction up to 40 degree Celcius.

• Increasing the temperature increases the rate of the reaction up to 50 degree Celcius.

The diagram shows an investigation into factors affecting photosynthesis. The tubes are left for 24 hours after which the leaves are tested with iodine solution.

How many of these leaves turn blue-black when tested with iodine solution?

• 1

• 2

• 3

• 4

The diagram shows part of the digestive system.

Which labelled parts produce digestive enzymes, absorb water and store bile?

• 
• 
• 
• 

Which changes increase the rate of transpiration?

1 increasing temperature

2 increasing humidity

3 decreasing temperature

4 decreasing humidity

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

When a person exercises for 10 minutes, what is the effect on the depth and rate of their

breathing?

• A

• B

• C

• D

What is a hormone?

• a chemical substance, produced by a gland, which alters the activity of target organs

• a protein that acts as a biological catalyst

• a thread-like structure of DNA, carrying genetic information in the form of genes

• an electrical signal that travels along a nerve cell to an effector