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General Biology I (Bio 111) Exam 2 Questions and Answers
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General Biology I (Bio 111) Exam 2 Questions and Answers
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General Biology I (Bio 111)Exam 2
Example Exam Questions
1. Chemicals with local, short-lived effects are typically described as ___________ signals.
a. exocrine
b. endocrine
c. endergonic
d. paracrine
e. silly
2. An important coenzyme in catabolism which accepts electrons/hydrogens is ______.
a. FADH
b. NAD+
c. ATP
d. a and b
e. a, b and c
3. When a molecule gains one or more electrons, it is said to be __________ .
a. oxidized
b. reduced
c. polarized
d. activated
e. calmed down
4. Under standard (STP) conditions, ATP can release ______ of energy.
a. < 1 cal/mol
b. 689 kcal/mol
c. 4 kcal/mol
d. 7.3 kcal/mol
e. 80 kcal/mol
5. In oxidative respiration of carbohydrates, energy is harvested from molecules such as
glucose in a sequence of four major pathways. Which of the following is not one of
these four carbohydrate pathways?
a. the Krebs cycle
b. glycolysis
c. the electron transport chain
d. beta oxidation
e. pyruvate oxidation
,6. Energy can be interconverted to different forms. However, some energy is always lost
as _______ with each conversion.
a. electrical energy
b. chemical energy
c. classical energy
d. heat energy
e. work energy
7. The chief energy exchange in cells is via a molecule called _________ . The hydrolysis
(breakdown) of this molecule has a ________ .
a. cAMP, positive Ä G
b. cGMP, positive Ä G
c. ATP, negative Ä G
d. ATP, positive Ä G
e. cyclic GMP, negative Ä G
8. Which of the following are important metabolites in glycolysis?
a. citric acid and oxaloacetate
b. cellulose and triglyceride
c. glyceraldehyde-3 phosphate and pyruvate
d. cytochrome c and coenzyme Q
e. acetyl CoA and ATP synthase
9. The regulation of simple biochemical pathways often involves the end-product
metabolite binding to an allosteric site on the first enzyme in the sequence and inhibiting
its activity. This mode of action can be called _______ .
a. competitive inhibition
b. noncompetitive inhibition
c. feedback inhibition
d. a and c
e. b and c
10. Which of the following statements concerning metabolic reactions are true?
a. At the end of catabolism, the oxidized molecules have a lower total energy than
the starting metabolites in the pathway.
b. Organisms can derive energy from the oxidation of organic compounds..
c. Oxidation reactions and reduction reactions always occur independently from
each other in cell metabolism.
d. a and b
e. a, b and c
, 11. (True/ False) In an enzyme catalyzed reaction, the enzyme -substrate complex
formation is usually the rate limiting step.
a. True
b. False
12. In oxidative phosphorylation (chemiosmosis) the synthesis of ATP is driven by _______
.
a. phosphate (Pi ) transfer through the plasma membrane.
b. the Na+/K+ ATPase pump
c. the higher H+ concentration within the inter-membrane space
d. the osmosis of large macromolecules
e. the large quantities of substrate-level phosphorylation by phosphoenol pyruvate
13. Enzymes catalyze chemical reactions by _______________ of the reaction.
a. lowering the entropy
b. lowering the overall free energy
c. raising the overall free energy
d. lowering the activation energy
e. lowering the calories
14. The oldest catabolic process common to most aerobic and anaerobic living organisms,
is ____________ .
a. glycolysis
b. fermentation
c. the Krebs cycle
d. electron transport chain reactions
e. pyruvate oxidation
Which of the following are products of glycolysis ?
15.
a. pyruvate
b. ATP
c. NADH
d. a and b
e. a, b and c
The enzymes catalyzing the reactions of glycolysis are found in the ____ of a cell.
16.
a. mitochondria
b. cytoplasm
c. lysosomes
d. peroxisomes
e. Golgi apparatus
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