Download BIO 101 Exam 2 practice questions Practice questions Ch 8,9 YOU

BIO 101 Exam 2 practice questions
Practice questions Ch 8,9 YOU MUST STUDY ] NOTES AND TEXTBOOK BEFORE ATTEMPTING THESE
1. Choose the pair that completes this sentence: Catabolism is to anabolism as ___ is to __
a. Exergonic: spontaneous
b. Exergonic: endergonic
c. Heat: entropy
d. First law of thermodynamics: second law
2. Most cells cannot harness heat to perform work because
a.
b.
c.
d.
Cells do not have much heat, they are relatively cool
Heat can never be used to do work
Heat must remain constant during work
Temperature is usually uniform throughout a cell
30.
3. Which of the following metabolic processes can occur without a net influx of energy?
a.
b.
c.
d.
ADP +
→ ATP + H2O
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
6 CO2 + 6 H2O → C6H12O6 + 6 O2
amino acids → protein
4. If an enzyme in solution is saturated with substrate, the most effective way to obtain
a faster yield of products is to
a. add more enzyme.
b. heat the solution to 90°C.
c. add more substrate.
d. add a noncompetitive inhibitor.
5. Some bacteria are metabolically active in hot springs because
a. they are able to maintain a lower internal temperature.
b. high temperatures make catalysis unnecessary.
c. their enzymes have high optimal temperatures
d. their enzymes are insensitive to temperature
6. Using a series of arrows, draw the branched metabolic reaction pathway described by the following statements, and then
answer the question at the end. Use red arrows and minus signs to indicate inhibition.
L can form either M or N.
M can form O.
O can form either P or R.
P can form Q.
R can form S.
O inhibits the reaction of L to form M.
Q inhibits the reaction of O to form P.
S inhibits the reaction of O to form R.
Which reaction(s) would prevail if both Q and S were present in the cell in high concentrations?
a. L  M
b. M O
c. L N
d. O P
e. R S
BIO 101 Exam 2 practice questions
Examine the following reaction, and then answer the questions below:
catecholase
catechol + oxygen (O2)---------------> polyphenol
12. The enzyme in this reaction is...
a. catechol
b. oxygen
c. catecholase
d. polyphenol
13. . The product in this reaction is...
a. catechol
b. oxygen
c. catecholase
d. polyphenol
14. The substrate in this reaction is...
a. catechol
b. catecholase
c. polyphenol
d. ATP
15. An enzyme is made of:
a. carbohydrate
b. protein
c. nucleic acid
d. lipid
16. Competitive inhibitors stop an enzyme from working by…
a. changing the shape of the enzyme
b. merging with the substrate instead
c. blocking the active site of the enzyme
d. combining with the product of the reaction
17. When a molecule binds to an area of an enzyme that is not the active site, and changes the shape of
the enzyme so that it no longer can work, this is called...
a. denaturation
b. competitive inhibition
c. noncompetitive inhibition
d. substrate delocation
18. In an enzymatic reaction, the amount of _____ determines the amount of product produced.
a. catalyst
b. reactant
c. oxygen
d. enzyme
e. water
19. The name of an enzyme usually ends in:
a. -ing
b. -and
c. -ase
d. –eme
BIO 101 Exam 2 practice questions
20. When a molecule other than the substrate binds to the active site of an enzyme, this is.
a. denaturation
b. competitive inhibition
c. noncompetitive inhibition
d. substrate delocation
21. An enzyme:
a. is a substrate
b. is catalyst
is used up in a reaction
c. none of the above
22. To overcome an energy barrier between reactants and products, energy must be provided to get
the reaction started. This energy, which is recovered as the reaction proceeds, is called:
a. activation energy
b. initiation energy
c. reaction energy
d. kinetic energy
23. Exergonic reactions:
a.
b.
c.
d.
release energy
are spontaneous reactions
can be coupled to energonic reactions
All statements are true
24. Enzymes:
can bind metal ions that participate in reactions.
A.
have defined structures.
B.
bind their substrates at active sites.
C.
all statements are true.
D.
25. A(n) _______ reaction releases energy. Energy must be added for a(n) _______ reaction to proceed.
a. enzyme catalyzed, non-spontaneous
b. exergonic, endergonic
c. endergonic, spontaneous
d. catalytic, non-catalytic
26. Consider the reaction: Glucose + ATP  Glucose-6-phosphate + ADP
Δ G is + 12.6 kJ/mol.
a. The reaction is endergonic and thus makes free energy available to fuel life processes
b. The reaction requires free energy and thus is endergonic
c. This is an exergonic reaction which is spontaneous and makes energy available
d. The reaction requires free energy and is exergonic
27. Glycolysis leads to production of ___ and 2 ATP. In the absence of oxygen, fermentation leads to
production of ___. Glycolysis plus citric acid cycle can convert the carbons of glucose to ___, storing energy as
ATP, _____ and __.
lactic acid, pyruvate, CO2, NADH, FADH2
A.
B.
pyruvate, lactic acid, CO2, NADH, FADH2
C.
CO2, NADH, FADH2, lactic acid, pyruvate
D.
O2, lactic acid, pyruvate, FADH2
E.
glucose, lactic acid, CO2, NADH, FADH2
BIO 101 Exam 2 practice questions
28. At the end of glycolysis, each molecule of glucose has yielded 2 molecules of _______, 2 molecules of ________, and a
net of 2 molecules of _________.
A.
B.
C.
D.
E.
FAD; NAD+; ADP
CO2; NAD+; ADP
lactic acid; ethanol; CO2
pyruvate, NADH, ATP
H2O; CO2; ATP
29. The electron transport chain is located predominantly in the:
i. Outer membrane of the mitochondria
ii. Intermembrane space of the mitochondria
iii. Inner membrane of the mitochondria
iv. Matrix of the mitochondria
v. Cytoplasm of the cell
30. The terminal electron acceptor during mitochondrial respiration:
A.
B.
H20
NADH
D.
E.
ATP
O2
31. ATP synthase can produce ATP using as a direct energy source:
a. energy from the conversion of glucose to pyruvate
b. energy from the oxidation of pyruvate producing CO2 and H20
c. energy from a proton (H+) gradient established in mitochondria
d. energy derived from the breakdown of NADH and FADH2
32. Place in 3 groups to represent the steps of cellular respiration. A few may be placed in more than one
Group
Glycolysis
2 Pyruvate
Acetyl CoA
Carbon dioxide released
Oxygen used
Electron transport
ATP synthase
Mitochondrial matrix
Citric acid cycle
H+ ion gradient
CO2 release
Glucose
NADH produced
NADH and FADH2 donate electrons
Anaerobic
2 ATP yield per molecule glucose
34 ATP yield per molecule glucose
ADP  ATP
Energy investment phase
1 ATP per turn of cycle
Oxidative phosphorylation
10 controlled steps
Mitochondrial inner membrane
Cytoplasm