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Mutiple choice

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) In absence of oxygen, a yeast cell undergoes fermentation and uses 100 molecules of glucose. How much net ATP will be generated?
A) 100 B) 36 C) 400 D) 300 E) 200

2) All the following statements pertaining to catalysts are true EXCEPT
A) catalysts are not permanently altered during reaction.
B) catalysts increase reaction rate.
C) catalysts increase activation energy requirements.
D) biological catalysts are specific enzymes.
E) catalysts can be used over and over again.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

6) Both plants and animals perform
A) glycolysis.
B) fermentation.
C) Krebs cycle.
D) photosynthesis.
E) A, B and C are correct.

7) The insecticide rotenone inhibits one of the steps of the electron transport system in mitochondria. What is the immediate result?
A) Electron transport will increase.
B) Transport of pyruvate into the mitochondria will increase.
C) The cells will utilize oxygen more rapidly.
D) The rate of the Krebs cycle reactions will increase.
E) The rate of fermentation will increase.

8) Which of the following has potential energy?
A) a diver on a springboard
B) a water droplet on top of a waterfall
C) a glucose molecule
D) a 9V battery
E) all of the above

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

11) The products of glycolysis are
A) ATP, NADH, pyruvate, FADH2.
B) ATP, NADH, pyruvate.
C) ATP, NADH, FADH2, CO2.
D) ATP, NADH, Acetyl CoA.
E) ATP and pyruvate.

12) During which part of aerobic respiration is the oxygen actually used?
A) fermentation
B) conversion of pyruvate to Acetyl CoA
C) glycolysis
D) electron transport system
E) Krebs cycle

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

14) When a muscle cell demands energy to perform its work of contraction, what happens to ATP?
A) ATP is broken down.
B) ATP receives an extra phosphate.
C) ATP enters a metabolic pathway.
D) ATP manufactures more ATP.
E) ATP catalyzes the reaction.

15) Each of the following contains twelve carbon atoms. Which of the arrangements demonstrates carbon atoms with the greatest entropy?
A) four molecules of C3H4O3
B) twelve molecules of CO2
C) one molecule of C12H22O11
D) two molecules of C6H12O6
E) It is impossible to determine.

16) Which of the following colors of light will be most effective for growth of green plants?
A) orange and yellow
B) red and blue
C) red and green
D) blue
E) green

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Amino acids multiple choice questions

Which statement is incorrect about the classification of amino acids?
a. Alanine and valine are neutral, nonpolar amino acids.
b. Lysine and arginine are basic amino acids.
c. Tryptophan and phenylalanine are aromatic amino acids.
d. Aspartic acid and aspargine are acidic amino acids.

Which of the following amino acids is the least water soluble at pH 7.0?
a. Tryptophan
b. Glutamic acid
c. Cysteine
d. Histidine

Which amino acid would migrate the furthest toward the anode (positive electrode) during paper electrophoresis at pH 7.0?
a. Aspartic acid
b. Alanine
c. Lysin
d. Glutamine

Which of the following functional groups, attached to an inert matrix, could function as a cation exchanger?
a. Diethylaminoethyl-
b. p-aminobenzyl-
c. Carboxymethyl-
d. Trimethylammonium-

Which of the following amino acids would make the best buffer at pH 4.5?
a. Histidine
b. Alanine
c. Glutamine
d. Aspartic acid

Which fact is incorrect about stereoisomers?
a. A diastereomer is a nonsuperimposable non-mirror image.
b. An enantiomer is a nonsuperimposible mirror image.
c. Diastereomers have different melting points.
d. Diastereomers rotate plane polarized light in equal but opposite direction.

Which statement is incorrect about L-isoleucine?
a. Its enantiomer is named O-isoleucine.
b. It contains a total of two asymmetric or chiral carbons.
c. It can also be named as (28, 38)-isoleucine using the (R,8) system.
d. Its diastereomer would be named O-alloisoleucine.

An isoelectric amino acid was dissolved in water and the resulting pH was approximately 7.6. What amino acid would possess this property?
a. Alanine
b. Glutamic acid
c. Histidine
d. Lysine

What volume of NaOH is required to adjust the solution of monosodium aspartate to pH 9.8?
a. 1 ml
b. 2 ml
c. 3 ml
d. 6 ml or more

What volume of 2 N Hel is required to completely titrate the 4 mmol of monosodium aspartate?
a. 2 ml
b. 3ml
c. Aml
d. 6 ml or more

Which statement is correct about the peptide ala-ser?
a. Alanine is at the N-terminal of the peptide.
b. There are a total six atoms that lie in the plane of the peptide bond linking alanine to serine.
c. The alpha-carbon of alanine is sp3 hybridized d All the above are correct statements.

What is the product formed from the acid hydrolysis of a simple amide?
a. Acid & base
b. Aldehyde & alcohol
c. Acid & amine
d. Ester & alcohol

The complete acid hydrolysis of the peptide ala-gln-trp-ser would yield:
a. Ala, gin, trp, ser
b. Ala, glu, ser
c. Ala, glu, trp, ser
d. Ala. ser

Fibrous proteins, such as collagen, have which of the following properties?
a. Highly soluble in water
b. Their hydrophilic residues are directed into the interior of the protein
c. Exhibit enzymatic activity
d. Serve structural roles in the cell

Quaternary structure is associated with:
a. The overall shape of a polypeptide chain
b. The sum of the secondary and tertiary interactions
c. Simple proteins with only one subunit
d. The relative orientation of one polypeptide to another polypeptide in a multi-subunit protein.

The information needed to define the structure of a protein is essentially contained in:
a. Amino acid composition
b. Amino acid sequence
c. Secondary structure
d. Tertiary structure.

Insulin is a polypeptide hormone that contains two short polypeptide chains linked by two interstrand disulfide bonds. The most logical order of events to perform in order to sequence this protein would be:
A: The peptides are reduced with mercaptoethanol.
B: The peptides are sequenced using Edman chemistry .
C: The peptides are separated by chromatography techniques. 0: The peptides are alkylated with iodoacetamide.
a. A, D,C, B b.C,A, 0, B
c. C, B, A, 0
d. A, B, C, 0

Which statement is incorrect about the peptide val-asp-trp-asn-ser?
a. This peptide would show a strong absorption band at 280 nm.
b. Reaction with chymotrypsin would yield two peptides.
c. To synthesize this peptide using the solid phase method of Merrifield, the amino acid directly attached to the resin would be serine.
d. After the second round of Edman chemistry using the reagent PITC, the PTH -amino acid residue released would be PTH-asn.

Which statement is incorrect about the reaction of the peptide ser-Iys-asp-trp-cys-metasn-phe-ala with the following reagents?
a. Reaction with cyanogens bromide would yield two peptides.
b. Reaction with trypsin would result in three peptides. The smallest of three peptides would have the highest pi of the three.
c. Reaciton with chymotrypsin would result in the peptides ser-Iys-asp & try-cys-met-Iysasn-phe-ala .
d. Reaction with chymotrypsin would yield a different set of peptides that overlap those obtained with tryspsin

Determine the amino acid sequence of the following oligopeptide from the experimental data below:
The amino acid composition is found the be ala, Iys, phe, met, cys plus some
decompsition products.
2. The peptide has a molecular weight around 700 Da and absorbs at 280 nm.
3. Treatment with carboxypeptidase results in tryptophan and a peptide.
4. CNBr treatment yields a tetrapeptide and a dipeptide.
5. Trypsine digestion produces an amino acid and a pentapeptide with met on the amino end.
6. Chymotrypsin digestion yields a dipeptide and a tetrapeptide.
a. trp-Iys-met-cys-met-ala
b. Iys-met-cys-phe-ala-trp
c. trp-ala-phe-cys-met-Iys
d. Iys-ala-cys-phe-met -trp

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