Chemistry of Life Test

Where is the greatest amount of the world’s carbon found?

• atmosphere

• seafloor sediments

• ocean

• plants and animals

In what form is carbon found in the atmosphere?

• CO2

• C6H12O6

• H2O

• ATP

Which statement best describes the relationship between photosynthesis and cellular respiration?

• Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.

• Photosynthesis is part of the carbon cycle, and cellular respiration is not.

• Only plants perform

• Photosynthesis releases carbon into the atmosphere, and cellular respiration removes carbon from the atmosphere.

The carbon cycle ensures that carbon is not lost. Which is another important benefit of the carbon cycle?

• The carbon cycle ensures that living things have a continual source of hydrogen.

• The carbon cycle helps transport nutrients in bodies of water.

• The carbon cycle helps regulate Earth's temperature.

• The carbon cycle ensures that there is a continual supply of water.

What is a difference between starch and glycogen?

• Starch stores energy, and glycogen provides structural support.

• Starch is found in plants, and glycogen is found in animals.

• Starch is composed of fructose, and glycogen is composed of glucose.

• Starch is a monomer, and glycogen is a polymer.

What is the general term for any carbohydrate monomer?

• glucose

• polysaccharide

• monosaccharide

• fructose

Which carbohydrate can be used by the body as an immediate source of energy?

• glucose

• cellulose

• chitin

• glycogen

After school, Kai feels hungry and tired. He finds some sugar cookies in the cabinet and finishes the whole package.

Which statements best describe the role of glucagon and insulin in this scenario?

• Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. Insulin was secreted after he ate the cookies because his blood glucose was high.

• Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. Glucagon was secreted after he ate the cookies because his blood glucose was high.

• Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, insulin from the cookies increased his blood sugar levels.

• Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, glucagon from the cookies increased his blood sugar levels.

Responding to the environment is a characteristic of life best shown by which example?

• a human shivers on a cold day

• a horse trots in a field

• a dog swims in a pond

• a cat licks its paws

Organisms may contain up to five levels of organization within their bodies. Which level of organization is best represented by the liver?

• tissue

• organ

• organism

• organ system