DCD Unit3

Which statement best describes these two molecules?

• Sugar molecules are inorganic and fat molecules are organic.

• Sugar molecules are organic and fat molecules are inorganic.

• Energy for life processes can be stored within the chemical bonds of both molecules.

• .

  Energy for life processes can be stored within the chemical bonds of sugar molecules, only

Pepsin works best in which type of environment?

• Acidic only

• basic, only

• neutral

• sometimes acidic, sometimes basic

Which statement best describes the enzyme represented in the graphs below?

• This enzyme works best at a temperature above 50°C and a pH above 12.

• This enzyme works best at a temperature of 50°C and a pH of 12

• .

  Temperature and pH have no effect on the action of this enzyme.

• This enzyme works best at a temperature of 35°C and a pH of 8.

Experiments revealed the following information about a certain molecule:

 

It can be broken down into amino acids.

It can break down proteins into amino acids.

It is found in high concentrations in the small intestine of humans.

 

This molecule is most likely ___.

• inorganic

• carbohydrates

• enzymes

• Lipids

An amoeba is a single-celled, heterotrophic organism. In order to meet its energy needs, it relies directly on the interaction of which cell structures?

• Vacuole and nucleus

• the cell membrane and mitochondria

• Rough ER and Ribosomes

• Chloroplast and membrane

It may be harmful when people compete to see who can hold their breath the longest under water. Without oxygen, brain cells _____.

• have to much water

• cannot make enough ATP

• have to much sugar

• Make to many enzymes.

In which direction do particles in a solution move during diffusion?

• from left to right

• from lower to higher areas of concentration

• from higher to lower areas of concentration

• from right to left

What is a difference between the two macromolecules in the image?

• Starch is smaller than glucose

• Glucose is smaller than starch

• Starch has 1 ring

• Starch has the same amount of rings as glucose.

What is a difference between the two macromolecules in the image?

• Starch is used for quick energy and glucose is for stored energy.

• Starch is used for stored energy and glucose for stored energy.

• Starch is used for stored energy and glucose for quick energy.

• No differences

Base your answer to the following question on the diagram below, which represents a chemical reaction that occurs in the human body, and on your knowledge of biology. Substances X and Y are examples of which kind of molecule?

• simple sugar

• fat

• hormone

• amino acid