The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

Enzyme decrease the activation energy of the reaction.

Enzymes increase the energy of the reactants.

Enzymes decrease the energy level of the products.

Enzymes reverse the direction of the reaction.

Which of the following conclusions can be drawn from this graph?

The optimum pH of the enzyme is 6.6.

The optimum pH of the enzyme is 5.8

The enzyme’s activity increases as pH increases 5.0 to 9.0

The enzyme’s activity is greater around pH of 8.0 .

What is the function of an enzyme?

enzymes speed up chemical reactions

enzymes break themselves into small pieces

enzymes slow down chemical reactions

enzymes combine products to form reactants

What happens when enzymes are heated to a high temperature?

The shapes of the enzyme are altered denature

The enzymes' amino acid sequence changes.

Which of these is NOT true?

Enzymes can only be used once in a chemical reaction.

Enzymes can denature (change shape) when the temperature gets too high.

Extreme pH can denature enzymes.

Enzymes speed up chemical reactions.

Enzymes are made of fatty acids.

Enzymes speed up chemical reactions.

Enzymes react best at a specific temperature.

Enzymes only control ONE type of reaction.

Enzymes

Quiz

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Biology

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9th - 12th Grade

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Practice Problem

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Medium

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NGSS

MS-LS1-7, MS-PS1-2, HS-PS1-5

Standards-aligned

Busta Heine

Used 6K+ times

FREE Resource

About this resource

This quiz focuses squarely on enzyme structure and function, covering the fundamental concepts that form the backbone of biochemistry education at the high school level. The questions assess students' understanding of enzymes as biological catalysts, requiring knowledge of how enzymes lower activation energy to speed up chemical reactions, the lock-and-key versus induced-fit models of enzyme action, and enzyme specificity for particular substrates. Students must grasp the protein nature of enzymes, recognize the typical "-ase" suffix in enzyme nomencology, and understand the concept of active sites where substrate binding occurs. The quiz also tests comprehension of factors affecting enzyme activity, including temperature and pH optimization, denaturation under extreme conditions, and the reusable nature of enzymes. Graph interpretation skills are essential as students analyze enzyme activity curves showing optimal pH and temperature ranges, while diagram analysis requires identifying components of enzyme-substrate interactions. Created by Busta Heine, a Biology teacher in the US who teaches grades 9-12. This comprehensive assessment serves multiple instructional purposes throughout an enzyme unit, functioning effectively as a review tool before major tests, a formative assessment to gauge student understanding mid-unit, or homework practice to reinforce classroom learning. The quiz works particularly well as a warm-up activity to activate prior knowledge before diving into more complex biochemical pathways, or as a diagnostic tool to identify misconceptions about enzyme function that need additional instruction. The variety of question formats, including multiple choice items with graphs and diagrams, makes this suitable for differentiated instruction and helps students prepare for standardized biology assessments. This quiz aligns with NGSS HS-LS1-6, which focuses on how molecules flow through organisms and how chemical reactions support life processes.