Question 1

A series of sequential chemical reactions which are maintained in the cell are called:

Accepted Answer

A) chemical reactions 
B) biochemical pathways 
C) energy steps 
D) second messenger cascades 
A) chemical reactions 
B) biochemical pathways 
C) energy steps 
D) second messenger cascades

Question 2

One type of biochemical pathway regulation is referred to as feedback inhibition.This means that as the

Accepted Answer

A) cell produces more quantity of product through a biochemical pathway,the build up of that product will inhibit the activity of that product's production. 
B) cell produces more quantity of product through a biochemical pathway,the activity will be increased or stimulated by the build up of that product. 
C) cell produces less quantity of product through a biochemical pathway,the activity will be inhibited by not having enough of that product. 
D) cell produces less quantity of product through a biochemical pathway,the activity of the substrate will be increased and that it will exceed capacity of the pathway. 
A) cell produces more quantity of product through a biochemical pathway,the build up of that product will inhibit the activity of that product's production. 
B) cell produces more quantity of product through a biochemical pathway,the activity will be increased or stimulated by the build up of that product. 
C) cell produces less quantity of product through a biochemical pathway,the activity will be inhibited by not having enough of that product. 
D) cell produces less quantity of product through a biochemical pathway,the activity of the substrate will be increased and that it will exceed capacity of the pathway.

Question 3

A new antibiotic has been developed that will use competitive inhibitor enzyme inhibition.This means that the

Accepted Answer

A) antibiotic will compete for substrate binding sites on the enzyme. 
B) antibiotic will compete for binding sites on the substrate. 
C) antibiotic will compete for binding sites on the enzyme-substrate complex. 
D) antibiotic will compete for binding sites on the product that is being produceD. 
E) antibiotic will only compete for binding sites on the receptor proteins embedded in the phospholipid bilayer. 
A) antibiotic will compete for substrate binding sites on the enzyme. 
B) antibiotic will compete for binding sites on the substrate. 
C) antibiotic will compete for binding sites on the enzyme-substrate complex. 
D) antibiotic will compete for binding sites on the product that is being produceD. 
E) antibiotic will only compete for binding sites on the receptor proteins embedded in the phospholipid bilayer.

Question 4

The chemistry of living systems representing all chemical reactions is called

Accepted Answer

A) catabolism. 
B) anabolism. 
C) metabolism. 
D) enzymology. 
E) thermodynamics. 
A) catabolism. 
B) anabolism. 
C) metabolism. 
D) enzymology. 
E) thermodynamics.

Question 5

Part of the complete enzyme;nonprotein,organic component.

Accepted Answer

A) active site 
B) substrate 
C) coenzyme 
D) non-catalytic binding site 
A) active site 
B) substrate 
C) coenzyme 
D) non-catalytic binding site

Question 6

A chemical reaction which requires energy is called an ________________ reaction.

Accepted Answer

A) exergonic 
B) endergonic 
C) explosive 
D) heating 
A) exergonic 
B) endergonic 
C) explosive 
D) heating

Question 7

After getting off the ski lift,you choose a trail that requires you to ski up a small incline before beginning the downward section of the trail.In this scenario,the hill is analogous to

Accepted Answer

A) free energy. 
B) potential energy. 
C) kinetic energy. 
D) activation energy. 
A) free energy. 
B) potential energy. 
C) kinetic energy. 
D) activation energy.

Question 8

When an atom or molecule gains one or more electrons,it is said to be

Accepted Answer

A) energized. 
B) oxidized. 
C) polarized. 
D) activateD. 
E) reduced. 
A) energized. 
B) oxidized. 
C) polarized. 
D) activateD. 
E) reduced.

Question 9

The organic non-protein components that aid in enzyme functioning are called

Accepted Answer

A) reactants. 
B) cofactors. 
C) coenzymes. 
D) substrates. 
E) products. 
A) reactants. 
B) cofactors. 
C) coenzymes. 
D) substrates. 
E) products.

Question 10

A new antibiotic has been developed that will use noncompetitive inhibitor enzyme inhibition.This means that the

Accepted Answer

A) antibiotic will bind to the enzyme and alter the shape of the enzyme. 
B) antibiotic will bind to the substrate and alter the shape of the substrate. 
C) antibiotic will bind to the enzyme-substrate complex and alter its shape. 
D) antibiotic will bind to the product that is being produced and alter its shape. 
E) antibiotic will bind to the receptor proteins embedded in the phospholipid bilayer,which will in turn close the channels. 
A) antibiotic will bind to the enzyme and alter the shape of the enzyme. 
B) antibiotic will bind to the substrate and alter the shape of the substrate. 
C) antibiotic will bind to the enzyme-substrate complex and alter its shape. 
D) antibiotic will bind to the product that is being produced and alter its shape. 
E) antibiotic will bind to the receptor proteins embedded in the phospholipid bilayer,which will in turn close the channels.

Question 11

A ribozyme catalyzes a reaction on itself and actually changes shape.This is an example of

Accepted Answer

A) intra-enzyme reactions 
B) inter-enzyme reactions 
C) intramolecular catalysis 
D) intermolecular catalysis 
A) intra-enzyme reactions 
B) inter-enzyme reactions 
C) intramolecular catalysis 
D) intermolecular catalysis

Question 12

The sites where molecules other than substrates bind in an enzyme to alter its activity are called ____________ sites.

Accepted Answer

A) catalytic 
B) allosteric 
C) metabolic 
D) amino acid 
E) activity 
A) catalytic 
B) allosteric 
C) metabolic 
D) amino acid 
E) activity

Question 13

Energy is defined as:

Accepted Answer

A) heat 
B) the capacity to do work 
C) change 
D) movement 
A) heat 
B) the capacity to do work 
C) change 
D) movement

Question 14

Hemoglobin is a protein composed of four subunits,each with a binding site for oxygen.When a molecule of O2 binds to any one of the subunits,the affinity of the other three subunits for O2 is increased.What role is oxygen playing in this process?

Accepted Answer

A) enzyme 
B) allosteric activator 
C) allosteric inhibitor 
D) substrate 
A) enzyme 
B) allosteric activator 
C) allosteric inhibitor 
D) substrate

Question 15

The substance on which the enzyme works;the raw material of the reaction.

Accepted Answer

A) active site 
B) substrate 
C) coenzyme 
D) non-catalytic binding site 
A) active site 
B) substrate 
C) coenzyme 
D) non-catalytic binding site

Question 16

Reactions that do not proceed spontaneously because they require energy from an outside source are called

Accepted Answer

A) exergonic. 
B) xerogonic. 
C) metaboliC. 
D) endergonic. 
E) endocytic. 
A) exergonic. 
B) xerogonic. 
C) metaboliC. 
D) endergonic. 
E) endocytic.

Question 17

In the hypothetical biochemical pathway,P $\rarr$Q + R $\rarr$ S $\rarr$T,which step is likely to have evolved first?

Accepted Answer

A) P $\rarr$ Q 
B) Q + R 
C) R $\rarr$ S 
D) S $\rarr$ T 
A) P $\rarr$ Q 
B) Q + R 
C) R $\rarr$ S 
D) S $\rarr$ T

Question 18

Enzymes catalyze chemical reactions by lowering the

Accepted Answer

A) entropy. 
B) free energy. 
C) activation energy. 
D) enthalpy. 
E) calories. 
A) entropy. 
B) free energy. 
C) activation energy. 
D) enthalpy. 
E) calories.

Question 19

Oxidation and reduction reactions are chemical processes that result in a gain or loss in

Accepted Answer

A) atoms. 
B) neutrons. 
C) electrons. 
D) molecules. 
E) protons. 
A) atoms. 
B) neutrons. 
C) electrons. 
D) molecules. 
E) protons.

Question 20

If you were an enzyme and needed to perform the energetically unfavorable conversion of X to Y,you would

Accepted Answer

A) couple it to a second reaction associated with a large decrease in free energy. 
B) couple it to a second reaction associated with a large increase in free energy. 
C) couple it to the formation of ATP from ADP and Pi. 
D) couple it to an endergonic reaction. 
A) couple it to a second reaction associated with a large decrease in free energy. 
B) couple it to a second reaction associated with a large increase in free energy. 
C) couple it to the formation of ATP from ADP and Pi. 
D) couple it to an endergonic reaction.

Exam 6: Energy and Metabolism

A series of sequential chemical reactions which are maintained in the cell are called:

One type of biochemical pathway regulation is referred to as feedback inhibition.This means that as the

A new antibiotic has been developed that will use competitive inhibitor enzyme inhibition.This means that the

The chemistry of living systems representing all chemical reactions is called

Part of the complete enzyme;nonprotein,organic component.

A chemical reaction which requires energy is called an ________________ reaction.

After getting off the ski lift,you choose a trail that requires you to ski up a small incline before beginning the downward section of the trail.In this scenario,the hill is analogous to

When an atom or molecule gains one or more electrons,it is said to be

The organic non-protein components that aid in enzyme functioning are called

A new antibiotic has been developed that will use noncompetitive inhibitor enzyme inhibition.This means that the

A ribozyme catalyzes a reaction on itself and actually changes shape.This is an example of

The sites where molecules other than substrates bind in an enzyme to alter its activity are called ____________ sites.

Energy is defined as:

Hemoglobin is a protein composed of four subunits,each with a binding site for oxygen.When a molecule of O2 binds to any one of the subunits,the affinity of the other three subunits for O2 is increased.What role is oxygen playing in this process?

The substance on which the enzyme works;the raw material of the reaction.

Reactions that do not proceed spontaneously because they require energy from an outside source are called

In the hypothetical biochemical pathway,P →\rarr→ Q + R →\rarr→ S →\rarr→ T,which step is likely to have evolved first?

Enzymes catalyze chemical reactions by lowering the

Oxidation and reduction reactions are chemical processes that result in a gain or loss in

If you were an enzyme and needed to perform the energetically unfavorable conversion of X to Y,you would

The Science of Biology

The Nature of Molecules

The Chemical Building Blocks of Life

Cell Structure

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How Cells Harvest Energy

Photosynthesis

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How Cells Divide

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Conservation Biology

Hemoglobin is a protein composed of four subunits,each with a binding site for oxygen.When a molecule of O₂ binds to any one of the subunits,the affinity of the other three subunits for O₂ is increased.What role is oxygen playing in this process?

In the hypothetical biochemical pathway,P $\rarr$ Q + R $\rarr$ S $\rarr$ T,which step is likely to have evolved first?