The activity of a single-celled organism is represented in the diagram below.

Which concept is best illustrated by this diagram?*

The chart below shows a comparison of the blood sugar levels for two individuals who took part in a scientific study.

Scientists have observed that blood sugar levels rose by different amounts in the two individuals even though they were given identical portions of bananas and cookies. These results were obtained because*

Plants are green because they contain the protein chlorophyll. A bucket was left on the lawn for one week. When the bucket was removed, the grass under the bucket had turned from green to a yellowish white color. This change is due to the interaction between the grass and*

In the summer, the arctic fox appears brown because its cells produce a dark pigment. However, in the winter, the arctic fox appears white because the dark pigment is not produced. The color change is most likely due to the effect of*

Researchers recently discovered that when hammerhead sharks were moved to shallower water, resulting in exposure to increased light intensity, their backs turned a deep brownish black. Which statement best supports this observation?*

A hydrangea plant has blue flowers when grown in acidic soil, but has pink flowers when grown in basic soil. A clone of the pink-flowered plant is grown in acidic soil and produces blue flowers. This change in flower color is most likely due to*

The photographs below are of two Siamese cats.

The Siamese breed has a gene that controls fur color. The cat in the first photograph was kept indoors while the cat in the second photograph was kept outdoors. Which statement best explains the differences in fur color between these two cats?*

A photograph of a Siamese cat is shown below.

Siamese cats have dark fur on areas of the body that are cooler and light fur on parts of the body that are warmer. The color differences in this Siamese cat are most likely due to*

Identical twins were separated at birth and raised by two different families. Years later, one twin was a physically fit member of the cross-country team, and the other twin was overweight with slightly higher-than-normal blood pressure. The differences in these twins could be explained by the fact that*

The diagram below represents genetic material.

The expression of the section labeled X may be modified by*

Chlorophyll gives plants their green color. Chlorophyll is produced only when plants are exposed to light, so plants kept in darkness have no chlorophyll and appear white. The best explanation for this is that*

Identify two environmental factors that can lead to an increase in the number of epigenetic markers that modify gene expression. [1]*

Select one of these varieties and discuss a problem associated with the development of this new variety of organism. In your answer, be sure to:

• identify the variety you selected

• identify one biological process by which a population of this variety may develop resistance [1]

• describe how this process is involved in the production of a population of resistant organisms [1]

• identify one problem caused by this resistance [1]

• state one solution to this problem [1]

• identify one possible negative effect of this solution [1]

Variety: ________________________________*

For many years, health officials had encouraged using antibacterial hand soap. Today, many scientists recommend using hand soap with no added antibacterial substances. State one reason why using antibacterial hand soap may no longer be recommended. [1]*

Explain why some elephant species did not survive. [1]*