Enzymes & pH HW #1 (2025-2026)

Based on the investigation, the student should conclude that enzymes ____________________.

• function best within a specific range of conditions

• function best when observed in living cells

• are not affected by changes in environmental factors

• are easily broken down by hydrogen peroxide

Tags

NGSS.HS-PS1-5

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

In living cells, chemical processes, such as synthesis, all require the action of:

• specialized antibiotics

• hormones

• salts

• biological catalysts

The activity of which enzyme decreases in both acidic and basic environments?

• chymotrypsin

• pepsin

• cholinesterase

• papain

Shrimp that live in the cold waters off Alaska will die if introduced into warm water. One likely reason these shrimp do not survive is that enzymes in the shrimp ____________________.

• start to replicate

• change shape

• are composed of fat molecules that melt

• break down into small starch molecules

If the temperature of the tissue samples used in the experiment had been raised from 37°C (body temperature) to 50°C, the results would have been different because

• more enzymes are produced at higher temperatures, increasing the amount of hydrogen peroxide

• more hydrogen peroxide is released at higher temperatures, increasing the activity of catalase

• increasing temperatures altered the structure of catalase, decreasing oxygen production

• increasing temperatures decreased the synthesis of amino acids, increasing levels of hydrogen peroxide

Tags

NGSS.HS-PS1-5

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:

• are not affected by pH

• work best at different pH levels

• work best in an acidic environment

• work best in a basic environment

Which statement is supported by the information in the graph below?

• The enzymes respond in a similar way to changes in temperature.

• The enzymes in bacteria function best at 40°C.

• The enzymes function best at the same temperature.

• The enzymes break down the same substances.

The inability of an organism to produce certain proteins can occur when an organism is lacking an enzyme needed to combine (a) ____________________.

• oxygen molecules

• simple sugars

• amino acids
• biological catalysts

Tags

NGSS.HS-LS1-6

A student wants to test the hypothesis that an acidic environment will decrease enzyme activity. In the experiment, the student used an enzyme that breaks down hydrogen peroxide into water and bubbles of oxygen. To test the hypothesis, the student should collect data on the number of oxygen bubbles produced at different ____________________.

• temperatures

• pH levels
• enzyme concentrations

• concentrations of hydrogen peroxide