Unit 2 Characteristics of Living Things Regents Review LE

A fully functioning enzyme molecule is arranged in a complex three-dimensional shape. This shape determines the...

• specific type of molecule it interacts with during a reaction

• rate at which the enzyme breaks down during a reaction it regulates

• pH of all body systems

• temperature of the products of the reaction it regulates

A scientist plans to cut a segment of DNA so that it can be inserted into the DNA of a bacterium, a single-celled organism. The scientist needs to use a special type of organic molecule to perform this cutting process. This molecule is...

• a lipid

• a carbohydrate

• an enzyme

• a hormone

Which statement best describes enzymes?

• Every enzyme controls many different reactions.

• The rate of activity of an enzyme might change as pH changes.

• Temperature changes do not affect enzymes.

• Enzymes are produced from the building blocks of carbohydrates.

Tags

NGSS.HS-LS1-3

Hydrogen peroxide (H2O2) is a toxic by-product of cellular metabolism in aerobic organisms. The reaction below occurs within the cells to prevent the accumulation of hydrogen peroxide. In the reaction to the right, catalase functions as an...

• enzyme in the breakdown of hydrogen peroxide

• enzyme in the synthesis of hydrogen peroxide

• emulsifier in the digestion of hydrogen peroxide

• indicator in the detection of hydrogen peroxide

The graph below represents the effect of pH on three different enzymes at normal body temperature.

The graph illustrates that enzymes 1, 2, and 3

A) B C) D

• are not affected by pH

• work best at different pH levels

• work best in an acidic environment

• work best in a basic environment

Base your answer to the following question on the graph below and on your knowledge of biology.

Which section of the graph includes the point at which the enzyme started to denature?

A) I B) II C) III D) IV

• I

• II

• III

• IV

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

• water

• glycogen

• glycerol

• maltose

Which compound is inorganic?

• glucose

• carbon dioxide

• ethane

• stearic acid (Cl8H36O2)

Which elements are present in all organic compounds?

• hydrogen and oxygen

• nitrogen and oxygen

• nitrogen and carbon

• hydrogen and carbon

Tags

NGSS.HS-LS1-6

. Base your answer to the following question on the diagram below and on your knowledge of biology. The diagram represents a portion of a starch molecule.

The building blocks for this molecule are...

• amino acids

• simple sugars

• fats

• molecular bases

Tags

NGSS.MS-LS1-7