enzymes

define enzyme

• a substance produced by a living organism

• the nucleus

• the cell system

• the mitochondria

what is enzymes made up of

• DNA

• MRNA

• amino acids

• RNA

If an enzyme functions to enable the following reaction, which type of catalytic strategy is most likely, given the chemical reaction shown

• Proximity/Orientation catalysis

• Electrostatic catalysis

• Covalent catalysis

• Acid/Base catalysis

I. They increase the rate of reaction by stabilizing the transition state

II. They raise activation energy to shift the equilibrium to favor the products

III. They lower activation energy by altering the products of a reaction

Choose 1 answer:

• I only

• II +III

• I + III

• III only

In the first step of glycolysis, hexokinase produces glucose-6-phosphate. G-6-P itself can also bind to hexokinase at the active site, blocking access to ATP. This is an example of:

Choose 1 answer:

• Allosteric inhibition

• Feedback inhibition

• Non-competitive inhibition

• Uncompetitive inhibition

Which of the following will be true regarding enzymes saturated with substrate?

• At saturating levels of substrate, a competitive inhibitor will affect the reaction rate more than a non-competitive inhibitor

• An enzyme with lower K\text{}_{m}

  m

  start text, end text, start subscript, m, end subscript

  is more easily saturated than an enzyme with high K\text{}_{m}

  m

• Any excess substrate will shift the equilibrium towards the product end of the reaction

• Increasing the substrate concentration will appreciably increase the reaction rate

Which of the following is true concerning the induced fit model of enzyme catalysis?

• The active site can be influenced by molecules binding elsewhere on an enzyme

• The initial binding of enzyme and substrate is the most tightly bound conformation

• The induced fit must occur prior to the initial binding of enzyme and substrate in order for the reaction to proceed

• The binding of enzyme and substrate is weakest in the transition state

Which of the following enzyme classes catalyze reactions in which two molecules are covalently connected to each other?

• Kinase

• Lyase

• Isomerase

• Ligase

Where are enzymes produced?

• RNA

• DNA

• the cell system

• the pancreas

How are enzymes named?

• chromosomes

• catalyze

• protein

• cell trait