Biotechnology HW 5.3

What is the role of DNA polymerase in a cell?

• It breaks down DNA into nucleotides.

• It speeds up the synthesis of DNA by adding nucleotides to a growing DNA strand.

• It acts as a substrate for enzymes.

• It is not involved in DNA replication.

Enzymes are highly specific in that each enzyme catalyzes only one type of chemical reaction and has one or only a few ______.

• A) substrates

• B) products

• C) enzymes

• D) cells

Which of the following enzyme groups splits their substrates with the aid of water?

• Lyases

• Hydrolases

• Isomerases

• Transferases

Adenosine deaminase binds one of its substrates, 6-hydroxy-1, 6-dihydro purine nucleoside, and requires which ion as a cofactor?

• Calcium

• Magnesium

• Zinc

• Iron

What is the 'lock and key model' used to describe in enzyme function?

• The exact fit of enzyme and substrate

• The induced fit of enzyme and substrate

• The denaturation of enzymes

• The optimum pH for enzyme activity.

The temperature at which an enzyme has maximum activity is called the ________.

• optimum temperature

• denaturation point

• lock and key model

• induced fit model

What is the optimum pH for enzyme activity as shown in the graph?

• 3

• 7

• 10

• 12

Fill in the blank: The enzyme involved in phenylketonuria (PKU) is ________.

• protein kinase C (PKC)

• phenylalanine hydroxylase

• lactase

• amylase

Each enzyme only has 1 substrate that will fit its active site.  What is this called?

• reusablility
• denaturation
• specificity
• fragility

How many substrates does an enzyme usually catalyze?

• 1

• 2

• 3

• 4