Like animals, plants use a number of processes for the movement of substances. Which of the following requires a plant to use cellular energy?
The action of co-enzymes can affect the activity of an enzyme by:
What is the purpose of the mechanisms of homeostasis?
Which water treatment best reduces the risk of infection by killing pathogens in drinking water?
An experiment was conducted to examine the effect of ultraviolet radiation on the development of antibiotic resistance in a strain of bacteria. The table summarises the outcomes of this experiment.
Which observations can be used to demonstrate Koch’s contribution to understanding the cause of disease?
Students performed an investigation to compare the effectiveness of two water treatments for purifying pond water.
The two diagrams each represent a type of evolution -
Palaeontology contributes to our understanding of evolution by
Which of the following adaptations would decrease the chance of survival for a mammal living in an extremely cold habitat?
In fruit flies that are homozygous for the gene for vestigial wings have wings that are only tiny stumps if they are reared at room temperature (about 22oC). But if they are reared at temperatures as high as 32oC their wings will grow almost as long as normal wings. This is an example of:
Plants cannot move away from extremes of temperature. Which of the following mechanisms may be employed by plants in response to a large increase in temperature?
In the normal kidney of a human, which of the following substances would not be found in the Bowman's capsule?
The order of bases of a strand of DNA is AATGGCCA. What would be the order of bases on the complementary strand of DNA?
Which of the following statements is true?