Biochemistry

Atoms are made up of which 3 particles?

• protons, neutrons, and isotopes

• protons, electrons, and neutrons

• positives, negatives, and neutrals

• neutrons, isotopes, and electrons

Water is classified as an inorganic compound because it

• does not contain carbon
• does not contain nitrogen
• contains hydrogen
• contains oxygen

Tags

NGSS.MS-PS1-1

Which substance plays a major role in most of the chemical reactions that occur in a living cell?

• water
• glycogen
• glycerol
• maltose

Which statement describes all enzymes?

• They control the transport of materials.
• They provide energy for chemical reactions.
• They affect the rate of chemical reactions.
• They absorb oxygen from the environment.

Base your answers on the graph and your knowledge of biology.
Neither enzyme works at a pH of

• 1
• 5
• 3
• 13

Tags

NGSS.HS-PS1-5

Pepsin works best in which type of environment?

• acidic only
• basic only
• neutral
• sometimes acidic, sometimes basic

Which factor would have the least effect on the rate at which an enzyme breaks down starch?

•  the pH of the solution in which the reaction is occurring
• the concentrations of starch and enzyme
• the temperature at which the reaction is taking place
•  the wavelength of light illuminating the reaction

The distortion (change in shape) of enzyme molecules which occurs at high temperatures is known as

• synthesis
• specificity
• replication
• denaturation

Tags

NGSS.HS-PS1-5

An energy-rich organic compound needed by organisms is

• water
• salt
• oxygen
• glucose

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Two examples of carbohydrates are

• fatty acids and glycerol
• fats and waxes
• sugars and starches
• amino acids and alcohol