What is the purpose of an enzyme?

give permission for the reaction

control how many reactions occur

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 activation energy?

The minimum energy needed by the reactants to form the products.

The energy lost in the reaction

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 is not under the Cell Theory?

A cell is an indestructible particle

Cells are the basic unit of life

All organisms are made up of cells

Why would an enzyme not work effectively at temperatures above its optimal temperature?

The shape of the active site changes

The size of the substrate will change

The shape of the substrate changes

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

How does an enzymes shape relate to its function?

the enzyme is shaped specially for certain substrates to perform a specific reaction

the shape of the enzyme has no relation to its function

the enzyme shape acts as a receptor to certain products

the enzyme shape can fit into specific substrates to cease a reaction

Enzymes are important for the body because

lower the activation energy needed for the chemical reaction.

they increase the activation energy needed for a chemical reaction.

keep the activation energy of a chemical reaction at a constant level.

remove all of the activation energy needed for a chemical reaction.

Why is the “lock and key” analogy often used to describe enzyme function?

Each enzyme will fit with only one specific kind of substrate.

Each enzyme is the same as its substrate.

Each enzyme can only be used once in a reaction and cannot be used again.

Each enzyme has its own active site that will not fit with other active sites.

Sucrase has an optimum temperature of 37 C and an optimum pH of 6.2. What would happen if the pH changed to 3?

The reaction sucrase catalyzes would slow down

Sucrase would continue to work the same

The reaction sucrase catalyzes would speed up

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Biology Review #1

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

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Alexis Jackson

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50 questions

Show all answers

MULTIPLE CHOICE QUESTION

store genetic information

store energy (long-term)

store energy (short-term)

build skin, hair, nails, muscles

Which of the following organic compounds is the main source of energy for living things?

carbohydrates

lipids

nucleic acids

proteins

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Biology Review #1

50 questions

Proteins are made of monomers called ___________

DNA and RNA are examples of

Nucleotides are monomers of

Monosaccharides are monomers of

Waxes, oils and fats are examples of

What is the function of nucleic acids?

Which of the following organic compounds is the main source of energy for living things?

Which macromolecule stores energy, insulates us, and makes up the cell membrane?

Enzymes belong to which class of macromolecules?

What is the purpose of an enzyme?

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