Which of the following is true of the a and B anomers of D-glucose?A. They both rotate light to the right (i.e. +), but not to the same extent.B. The a anomer rotate light to the right, and the B anomer rotate light to the left.C. They are equally stable in solution.D. None of these.Item Weight: 1.0

Anomers are diastereomers. Diastereomers are stereoisomers with two asymmetric carbon atoms.…

Answered: Which of the following is true of the a…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Which of the following is TRUE, if the protein pH is electrically neutral? Refer to the graph below. a. The denaturation of protein is lower than 100% b. The denaturation of protein is greater than 100% c. The protein is in native form d. The protein is completely denatured
B-mercaptoethanol is a reducing agent for disulfide bonds, resulting in the breakage of the disulfide bond. The structure of the human milk protein B-casein is unaffected when exposed to B-mercaptoethanol. What does this indicate about the composition of B-casein? Select the best option. a. B-casein has no / few cystines. b. B-casein has no / few cysteines. c. B-casein has no / few methionines. d. B-casein has no / few amino acids with chiral side chains.
Dinah had her curly hair rebonded. One chemical is put on her hair to break the disulfide bonds that give the hair stands their shape (curly) and a second chemical is used to reform the disulfide bonds to hold the hair in a straight position. a. What level(s) of protein structure is/are affected by these processes? b. Why doesn’t the hair stay straight forever after this treatment
Why does in this experiment, after gel is formed from gelatin the marble in papaya juice to the first cup (Lot A), second cup (Lot B) and 10 ml of kiwi juice to the third cup (Lot C) disappeared? While in fourth cup (control) the marble did not disappear it just float on the surface. What is the action of protease on gelatin?
Identify which of the following amino acid residues can have hydrogen bonding between their side chain and the protein backbone. a. Tyrosine b. Alanine C. Leucine d. Asparagine Draw a picture showing the details of the hydrogen bonding between the side chain and the protein backbone for any amino acid residues from exercise 4 that are capable.
Bradford technique makes use of the Coomassie blue dye that binds to the protein, with the complex absorbing strongly at 465 nm. A. True B. False
For the tetrapeptide KASE: a. Draw its complete protonic equilibria. Indicate the net charge of each form and encircle the zwitterionic form. b. Give the full name of the tetrapeptide. c. Calculate its IpH. d. If the tetrapeptide was subjected to electrophoresis using a buffer solution at pH 7, at which electrode it will migrate?
Identify the incorrect statement regarding the polypeptide, Myoglobin. Select one: a. The interaction between Myoglobin and O2 is homotopic in nature as indicated by a Hill coefficient n = : 1 b. Myoglobin is found predominantly in muscle tissue because it facilitates oxygen diffusion. c. The majority of Myoglobin's secondary structure is composed of alpha-helices d. Myoglobin has a higher affinity for oxygen than Hemoglobin e. Myoglobin serves as an oxygen storage protein as suggested by its hyperbolic binding of 02
Scientists uncover a new pathway for synthesis of Threonine (see below). They also identify mutants that cannot grow on media lacking threonine (Thr-1, 2 and 3). These mutants have mutations in separate enzymes in this pathway. They are able to grow when different supplements are added to the media (see below). Based on this, what is the order of the enzymes in this pathway? a. Thr-2, 1, 3 b. Thr-2, 3, 1 c. Thr-1, 2, 3 d. Thr-3, 2, 1
A dipeptide is built from many amino acids: A. True B. False
A purified protein fraction has a total sample volume of 360 µL. The sample has a corrected A280 of 0.484, and the blank corrected A280 was 0.052. (Both values were measured with a path length of 1.00 cm.) If 5.00 µL of the sample was used in a reaction, calculate the mass of protein in the reaction (in µg).
The T state of hemoglobin is converted to the R state by what event? Select one: The binding of oxygen destabilizes a more planar heme ring which alters the position of the proximal histidine and subsequently, residues between the alß2 interface. а. b. None of these. The binding of oxygen stabilizes a more planar heme ring which alters the position of the proximal proline and subsequently, residues between the alß2 interface. С. d. The binding of oxygen stabilizes a more planar heme ring which alters the position of the proximal histidine and subsequently, residues between the alß2 interface. The binding of oxygen destabilizes a more planar heme ring which alters the position of the proximal proline and subsequently, residues between the alß2 interface. е.

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