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Multiple choice

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I am trying to double check the answers that you get with the ones that I have.

1) Lactose is a disaccharide of glucose and galactose, and its digestion requires the actions of the enzyme lactase If the lactose is taken in as part of the diet, but not digested by lactase, this sugar is then metabolized by bacteria in the intestine, leading to the symptoms of lactose intolerance. Lactose intolerance, therefore, results from
A) a lack of dehydration synthesis of lactose.
B) a low blood glucose level.
C) an inability of the body to produce glucose.
D) a lack of hydrolysis of lactose.

2) The antibiotic, polymyxin B, attaches itself to the phospholipids in the bilayers of bacterial cells and increases the permeability of the membrane. What is a likely result that this antibiotic will have on bacterial cells?
A) Certain substances will begin to accumulate in the cell.
B) The membrane will no longer be selectively permeable.
C) The cell will lyse as it becomes iso-osmotic with the surrounding medium.
D) Protein synthesis will be inhibited.
E) Cell wall synthesis will be inhibited.

3) Which of the following is TRUE of proteins in the plasma membrane?
A) They bind to small molecules needed by the cell and facilitate their movement across the hydrophobic lipid bilayers into areas where they are found in higher concentration.
B) They bind to small molecules needed by the cell and facilitate their movement across the hydrophobic lipid bilayers into areas where they are found in lower concentration.
C) They provides sites for recognition and binding of the cell by other cells.
D) They create channels which allow ions and small molecules to move across the membrane into areas where they are found in lower concentration.
E) all of the above

4) You might expect that drugs that inhibit microtubules will
A) stop organelle movement.
B) prevent the formation of new cilia and flagella.
C) inhibit cell division.
D) kill the cell.
E) all of the above

5) You have discovered a new virus and have isolated its nucleic acids. What feature could you look for to determine if the nucleic acids of this virus are RNA or DNA?
A) If it is RNA, it will contain uracil.
B) If it is DNA, the virus will not contain proteins.
C) If is RNA, it will contain thymine.
D) If it is RNA, there will be no adenine.

6) The blood plasma of a man who drinks saltwater will become __________ to his red blood cells, whereas the red blood cells will be __________ to the blood plasma.
A) isotonic; hypertonic
B) hypertonic; isotonic
C) isotonic; isotonic
D) hypotonic; hypertonic
E) hypertonic; hypotonic

7) Which of the following is/are important to the theory of evolution?
A) inheritance of traits
B) environmental change
C) variation in traits within a population
D) mutation
E) all of the above

8) NASA's Deep Space 1 probe used ion propulsion technology to propel it into outer space. Ion propulsion uses an electrical charge to ionize atoms such as xenon. These ions are funneled from the exhaust of the craft at such high speeds that it is pushed in the opposite direction and propelled into space. The electrical charge that is used to ionize xenon atoms most likely
A) change the atoms into radioactive isotopes.
B) cause electrons to be released from the atoms.
C) cause protons to become neutrons.
D) cause neutrons to be released from the atoms.

9) New government regulations require that foods containing trans fats be labeled appropriately. A trans fat is formed when food manufacturers turn liquid oils into solid fats by adding hydrogen to vegetable oils. How would this hydrogenation process produce a solid fat?
A) Adding the hydrogen allows fats to form a tertiary and quatenary structure.
B) The extra hydrogen forms a wax molecule.
C) Adding the hydrogen allows the fatty acid chains to pack together to form solid lumps.
D) Adding the hydrogen causes a phospholipid to form.

10) If you identified a cell with large amounts of rough ER, which would NOT be a logical conclusion about that cell?
A) Steroid hormones are produced by that cell.
B) Large amounts of protein hormone are exported by the cell.
C) Membrane proteins and phospholipids are made to replace other membranous components in the cell
D) Large quantities of enzymes for biochemical processes are manufactured by that cell.
E) Digestive enzymes for export are manufactured by that cell.

11) A plant cell adapted for waste storage and disposal would probably contain a large number of
A) mitochondria.
B) vacuoles.
C) ER membranes
D) ribosomes.
E) nuclei.

12) If you place a paper towel in a dish of water, the water will move up the towel by capillary action. What property of water gives rise to capillary action?
A) Water can form hydrogen bonds.
B) Water molecules separate into H+ and OH- ions.
C) Water is a good solvent.
D) Water molecules have hydrophobic interactions.
E) Water takes up large amounts of heat when it vaporizes.

13) It is possible to fuse together cells from two different sources. When a mouse cell whose membrane proteins have been stained red is fused with a human cell whose membrane proteins have been stained green, the different colored membrane proteins become uniformly distributed over the surface of the hybrid cell. This occurs because proteins
A) are found on the surface of the membrane.
B) are anchored within the membrane.
C) can move around within the bilayer.
D) are asymmetrically distributed within the membrane.
E) can be exposed on both the extracellular and cytoplasmic sides of the membrane.

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Solution Preview

1) Lactose is a disaccharide of glucose and galactose, and its digestion requires the actions of the enzyme lactase If the lactose is taken in as part of the diet, but not digested by lactase, this sugar is then metabolized by bacteria in the intestine, leading to the symptoms of lactose intolerance. Lactose intolerance, therefore, results from
D) a lack of hydrolysis of lactose.

2) The antibiotic, polymyxin B, attaches itself to the phospholipids in the bilayers of bacterial cells and increases the permeability of the membrane. What is a likely result that this antibiotic will have on bacterial cells?
B) The membrane will no longer be selectively permeable.

3) Which of the following is TRUE of proteins in the plasma membrane?
E) ...

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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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