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pH

values for the following solutions?(a)

0.1 M HCl

0.1 M NaOH

0.05 M HCl

0.05 M NaOH

Topic:

Chemistry

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Views: 5,367

Given a density of

1 g / ml

and a molecular weight of

18 g / mol

, calculate the concentration of water in water.

Topic:

Chemistry

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Views: 5,021

100 mL

of a solution of hydrochloric acid with

pH 5.0

1 L

pH

of the diluted solution?

Topic:

Chemistry

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Views: 5,911

p K_{a} .

HA

, the concentrations of HA and

A^{-}

0.025,

respectively, at

pH 6.0

p K_{a}

HA

Topic:

Chemistry

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Views: 5,258

p K_{a}

of 8.0 is present in a solution with a

pH

6.0.

What is the ratio of the protonated to the deprotonated form of the acid?

Topic:

Chemistry

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Views: 5,293

What is the ratio of the concentrations of

H_{2} PO_{4}^{-}

HPO_{4}^{2 -}

(a) pH 7.0;

(b) pH 7.5(c) pH 8.0?

Topic:

Chemistry

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Views: 5,045

Given that phosphoric acid

(H_{3} PO_{4})

can give up three protons with different

pK_{a}

values, sketch a plot of

pH

as a function of added drops of sodium hydroxide solution, starting with a solution of phosphoric acid at pH

1.0.

Topic:

Chemistry

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Views: 5,947

. Your friend from another laboratory was out of acetic acid, so tries to prepare the buffer in Problem 21 by dissolving

41.02 g

of sodium acetate in water, carefully adding

180.0 ml

1 M HCl

, and adding more water to reach a total volume of 2 liters. What is the total concentration of acetate plus acetic acid in the solution? Will this solution have pH

5.0 ?

Will it be identical with the desired buffer? If not, how will it differ?

Topic:

Chemistry

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Views: 5,726

You wish to make a buffer with pH7.0. You combine 0.060 grams of acetic acid and 14.59 grams of sodium acetate and add water to yield a total volume of 1 liter. What is the pH? Will this be the useful pH7.0 buffer you seek?

Topic:

Chemistry

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Question 10

Views: 5,943

Suppose two phosphate groups in DNA (each with a charge of -1 ) are separated by 12 A. What is the energy of the ionic interaction between these two phosphates assuming a dielectric constant of

80 ?

Repeat the calculation assuming a dielectric constant of 2

Topic:

Chemistry

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Question 11

Views: 5,018

The human body contains many distinct cell types yet almost all human cells contain the same genome with 21,000 genes. The distinct cell types are primarily due to differences in gene expression. Assume that one set of 1000 genes is expressed in all cell types and that the remaining 20,000 genes can be divided into sets of 1000 genes that are either all expressed or all not expressed in a given cell type. How many different cell types are possible if each cell type expresses 10 sets of these genes? Note that the number of combinations of n objects into m sets is given by n!/(m!(n-m)!) where n! = 1*

^{*} 2^{* \dots *} (n - 1)^{*} n

Topic:

Chemistry

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Question 12

Views: 5,932

Properties. In reference to the amino acids shown in Problem

1,

which are associated with the following characteristics?(a) Hydrophobic side chain ______.(b) Basic side chain _____ .(c) Three ionizable groups _____ .(d)

p K_{a}

of approximately 10 in proteins ______ .(e) Modified form of phenylalanine _______.

Topic:

Chemistry

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Question 13

Views: 5,131

Solubility. In each of the following pairs of amino acids, identify which amino acid would be more soluble in water:(a) Ala, Leu; (b) Tyr, Phe; (c) Ser, Ala; (d) Trp, His.

Topic:

Chemistry

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Question 14

Views: 5,363

Name those components. Examine the segment of a protein shown here. (FIGURE CANNOT COPY)(a) What three amino acids are present?(b) Of the three, which is the N-terminal amino acid?(c) Identify the peptide bonds.(d) Identify the

α

Topic:

Chemistry

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Question 15

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Ramachandran plots for two amino acids differ significantly from that shown in Figure2.23. Which two, and why?

Topic:

Chemistry

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Question 16

Views: 5,209

A mutation that changes an alanine residue in the interior of a protein to valine is found to lead to a loss of activity. However, activity is regained when a second mutation at a different position changes an isoleucine residue to glycine. How might this second mutation lead to a restoration of activity?

Topic:

Chemistry

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Question 17

Views: 5,167

Osteogenesis imperfecta displays a wide range of symptoms, from mild to severe. On the basis of your knowledge of amino acid and collagen structure, propose a biochemical basis for the variety of symptoms.

Topic:

Chemistry

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Question 18

Views: 5,871

Would you expect Pro-X peptide bonds to tend to have cis conformations like those of

X -

Pro bonds? Why or why not?

Topic:

Chemistry

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Question 19

Views: 5,907

Crafting a new breakpoint. Ethyleneimine reacts with cysteine side chains in proteins to form S-aminoethyl derivatives. The peptide bonds on the carboxyl side of these modified cysteine residues are susceptible to hydrolysis by trypsin. Why?

Topic:

Chemistry

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Question 20

Views: 5,247

A slow mover. Tropomyosin, a 70-kDa muscle protein, sediments more slowly than does hemoglobin (65 kDa). Their sedimentation coefficients are

2.6 S

4.31 S

, respectively. Which structural feature of tropomyosin accounts for its slow sedimentation?

Topic:

Chemistry

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