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1
Glucose contains more energy than the products of its metabolism, CO2 and H2O.
A)True
B)False
2
All chemicals have the same amount of potential energy.
A)True
B)False
3
Organisms require a constant supply of energy because _____.
A)they cannot create energy
B)when they transform energy some is lost as heat
C)maintenance of their cellular organization requires a lot of work
D)all of the above
4
Which of the following is an example of potential energy?
A)a big piece of chocolate cake
B)someone running a marathon
C)a fish swimming upstream
D)a leaf unfolding
5
Energy is needed by organisms to _____________.
A)respond to stimuli
B)reproduce
C)grow
D)all of the above
6
The entropy of the universe is decreasing.
A)True
B)False
7
Energy that is doing work is _____.
A)called potential energy
B)stored in the bonds of glucose
C)called kinetic energy
D)both A and B
8
Which of the following statements about energy is FALSE?
A)Energy can't be created and it can't be destroyed.
B)Chemical energy in our food can be transformed into energy needed for muscle contractions.
C)When energy is transformed, all of it is available to do work.
D)A battery you just bought at the store has potential energy.
9
Energy is constantly supplied to ecosystems by _____.
A)radioactive elements
B)the sun
C)heat from the ocean's thermal vents
D)gravity
10
Reactions which require an input of energy ___________.
A)are exergonic
B)are endergonic
C)will never occur
11
In the reaction A + B --> C + D, the reactant(s) is/are ______________.
A)only A
B)A and B
C)only D
D)C + D
12
If the change in free energy in both directions of a reaction is just about zero, the reaction is reversible.
A)True
B)False
13
Once ATP breakdown is coupled with muscle contraction, the overall process becomes exergonic and muscle contraction occurs.
A)True
B)False
14
The breakdown of ATP to ADP + P is a _____ reaction.
A)exergonic
B)endergonic
C)coupled
15
Which of the following is an example of an endergonic reaction?
A)muscle contraction
B)protein synthesis
C)nerve conduction
D)all of the above
16
All of the energy in glucose is transformed into ATP by the mitochondria.
A)True
B)False
17
The "energy currency" of the cell is _______.
A)ATP
B)glucose
C)ADP + P
D)starch
18
ATP is a _____.
A)protein
B)lipid
C)nucleotide
D)polysaccharide
19
Active transport could be described as _____.
A)exergonic
B)endergonic
20
The nitrogen base in ATP is _____________.
A)guanine
B)thymine
C)uracil
D)adenosine
21
When ATP becomes ADP + P, just enough energy is released to make cilia beat so little energy is wasted.
A)True
B)False
22
In a metabolic pathway, reactions occur haphazardly and have nothing to do with one another.
A)True
B)False
23
Enzymes are _____.
A)nucleotides
B)proteins
C)lipids
D)monosaccharides
24
Enzymes _____.
A)slow down chemical reactions
B)increase the energy of activation
C)bring together specific molecules and causes them to react with each other
D)all of the above
25
Enzymes lower the energy of activation of reactions so they can occur at body temperature.
A)True
B)False
26
In the metabolic pathway below, which letter does NOT represent a reactant?
A --> B --> C --> D --> E
A)B
B)C
C)D
D)E
27
Which of the following is NOT an enzyme?
A)DNA polymerase
B)carbonic anhydrase
C)sodium bicarbonate
D)helicase
28
Which of the following is a INCORRECT association of enzyme and substrate?
A)maltose - maltase
B)lipid - lipase
C)sucrose - lactase
D)acetylcholine - acetylcholinesterase
29
Enzymes bind to their substrates at any place on the substrate.
A)True
B)False
30
A very high fever (105°) is dangerous because enzymes can become denatured.
A)True
B)False
31
Denaturation _____.
A)changes the shape of the enzyme
B)prevents the enzyme from binding with its substrate molecules efficiently
C)occurs at temperatures above a certain point
D)all of the above
32
The pH in the stomach is about 2 and the pH in the small intestine is about 8. What will happen to pepsin, an enzyme that digests protei
A)ns to peptides in the stomach, when it moves into the small intestine?
B)Pepsin will continue to function efficiently.
C)Pepsin will become denatured.
D)Pepsin's shape will change.
E)both B and C
33
The speed of a reaction that involves an enzyme increases as
A)temperature decreases
B)pH becomes less than optimal
C)substrate concentration increases
D)all of the above
34
When a molecule binds to an enzyme at an allosteric site, _____ inhibition occurs.
A)competitive
B)noncompetitive
35
Enzyme activity can be inhibited by _____.
A)a molecule that blocks its active site
B)changes in pH
C)poisons such as cyanide
D)all of the above
36
Symptoms of a vitamin deficiency may actually be the result of a deficiency of a coenzyme needed to assist enzyme activity.
A)True
B)False
37
The activity of almost every enzyme in a cell is regulated by feedback inhibition.
A)True
B)False
38
In the reaction (NADP+ + 2e- + H+ --> NADPH) NADP+ is _____.
A)oxidized
B)reduced
39
During cellular respiration, glucose loses hydrogen ions so it is _____.
A)oxidized
B)reduced
40
Energy is released during cellular respiration so it is best described as _____.
A)endergonic
B)exergonic
41
Both photosynthesis and cellular respiration make use of an electron carrier and an electron transport system.
A)True
B)False
42
The coenzyme ____ accepts electrons during cellular respiration.
A)NAD+
B)ATP
C)niacin
D)zinc
43
ATP production in the electron transport system depends on _____.
A)the establishment of an electrochemical gradient
B)carrier proteins
C)ATP synthase
D)all of the above
44
Electron transport systems used to make ATP are located in the _____.
A)chloroplasts
B)nucleus
C)mitochondria
D)both A and C
45
Without __________ organisms, life as we know it could not exist.
A)photosynthetic
B)carnivorous
C)herbivorous
D)parasitic
46
Cells that do a lot of active transport have many _____.
A)mitochondria
B)nuclei
C)chloroplasts
D)plasmids
47
The exact mechanism of ATP synthesis has been known about for hundreds of years.
A)True
B)False
48
Oxidation and reduction reactions always occur at the same time because one molecule accepts the electrons given up by another molecule.
A)True
B)False
49
The sodium-potassium pump, associated with muscle and nerve cells, moves Na+ to the outside of the cell and K+ to the inside of the cell.
A)True
B)False
50
The functioning of the sodium-potassium pump depends upon the availability of ATP.
A)True
B)False







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