Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Chemistry Expert

Multiple choice problems on Chemical bonding.

1. The chirality of an amino acid, and hence it optical activity, results from the fact that its α carbon is bonded to four different chemical groups. Of the 20 common amino acids, which is not optically active?

a) serine.
b) tryptophane.
c) isoleucine.
d) glycine.
e) glutamic acid.

2. Identify the two amino acids shown below.

2220_amino acids.jpg



A) glycine and asparagine.
B) histidine and lysine.
C) proline and valine.
D) alanine and cysteine.
E) methonine and tryptophane.

3.For the peptide given below, what is its net charge at pH 3? (written N-termàC-term)
Glu-His-Trp-Ser-Gly-Leu-Lys-Gly

Use the following pKa values for the titratable groups:

pKa, N-terminus = 10.0
pKa, Glu, carboxyl side chain = 4.0
pKa, His, imidazole side chain = 6.0
pKa, Lys, amino side chain = 11.0
pKa, C-terminus = 2.0
A) -2
B) -1
C) 0
D) +1
E) +2

4.For the same peptide given in problem #13, what is its net charge at pH 5?
A) -2
B) -1
C) 0
D) +1
E) +2

5.For the same peptide given in problem #13, what is its isoelectric point (pI)?
A) 10
B) 8
C) 6
D) 4
E) 2

6.For the same peptide given in problem #13, what is its sequence (primary structure)?
A) GHTSGLLG
B) GLLGSTHG
C) GKLGSWHE
D) EHWSGLKG
E) GAVLIMPF

7. The absorbance measured for a protein sample at 280 nm was 5. Using an extinction coefficient of 10 cm-1M-1, and a 1 cm path length, find out the protein concentration in this sample.
A) 0.5 M
B) 3 M
C) 1.25 M
D) 5 M
E) 5 mM

8.In what order would the proteins listed below elute from an anion exchange column at pH 6?
Protein A 25 kDa pI = 8.0
Protein B 10 kDa pI = 4.0
A)first A, then B.
B) first B, then A.
C) These proteins would elute together.

9. For the same proteins shown in problem #17, in what order would these proteins elute using gel filtration chromatography?
A) first A, then B.
B) first B, then A.
C) these proteins would elute together.

Identify the type of bond linking amino acids together shown below.

 

2094_bond linking amino acids.jpg

A) hydrogen bond.
B) ion pair.
C) carbon-carbon bond.
D) van der Waals interaction.
E) peptide bond.

Chemistry, Academics

  • Category:- Chemistry
  • Reference No.:- M918963

Have any Question? 


Related Questions in Chemistry

Please respond to one of the below questions in detail

Please respond to ONE of the below questions in detail. These questions are taken from Sam Kean's "Questions and Topics for Discussion".  Your response needs to be 1-2 pages long, or approximately 700-900 words. Consider ...

Determine the mass of glucose c6h12o6s needed to produce a

Determine the mass of glucose, C6H12O6(s), needed to produce a 0.150m glucose solution in 50.0mL of C2H5OH(l), density 0.789g/mL

The volume of a sample of nitrogen is 600 liters at 35oc

The volume of a sample of nitrogen is 6.00 liters at 35oC and 740 torr. What volume will it occupy at STP?

Dtermine the percent yield of barium sulfate obtained

Determine the percent yield of barium sulfate obtained (4.9852g) when 100.0 mL of a 0.2516M aqueous barium chloride is treated with an excess of sulfuric acid? Hydrochloric acid is a by-product.

Aim - to understand the fundamentals of atomic structure

Aim - To understand the fundamentals of atomic structure, chemical bonding, periodic tableandits application in engineering problems - Objective - Observing and explaining the reasons of engineering chemistry related pro ...

One method to produce nitrogen in the lab is to react

One method to produce nitrogen in the lab is to react ammonia with copper (II) oxide: NH3(g) + CuO(s) Cu(s) + H2O(l) + N2(g). After using 40.0 grams of NH3, 15.5 grams of N2are produced. What is the percent yield of nitr ...

Explain why acidic rain produced as a result of excess

Explain why acidic rain produced as a result of excess sulphur dioxide in the atmosphere can cause degradation of buidings.

A coffee cup calorimeter having a heat capacity of 451 joc

A coffee cup calorimeter having a heat capacity of 451 J/ o C was used to measure the heat evolved when 0.0300 mol of NaOH(s) was added to 1000 mL of 0.0300 M HNO 3 initially at 23.000 o C. The temperature of the water r ...

Directionsrefer back to equation 2 and consider carefully

Directions: "Refer back to equation (2), and consider carefully whether you could simply have used the pH value of the solution at the very beginning of the titration, before any base had been added, to determine either ...

A sample has a specific heat of 0155 calgmiddotdegc how

A sample has a specific heat of 0.155 cal/g·°C. How much energy will be required to raise the temperature of the sample from 20.0°C to 35.0°C if the sample has a mass of 8.0 g?

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro