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

1liquid chromatography was used to measure the

1. Liquid chromatography was used to measure the concentration of caffeine in coffee. The caffeine standards used to make the calibration curve ranged from 2 ppm to 20 ppm. Analysis of the coffee sample using the curve y ...

Explain and show the chemical properties of tihydric

Explain and show the Chemical properties of tihydric alcohol

1 what are the advantages of color and tlc tests under what

1. What are the advantages of color and TLC tests? Under what circumstances might a color test be preferred over TLC ? 2. TLC data have been used as evidence in court cases. What do you think of this practice ? 3. How do ...

What is the description of a process in the human body that

What is the description of a process in the human body that is impacted by the atom zinc and its most common ion differently?

Chemical bondingmcq questionsisostructural species are

CHEMICAL BONDING MCQ Questions Isostructural species are those which have the same shape and hybridization. Among the given species identify the isostructural pairs. [NF 3 and BF 3 ] [BF 4 - and NH 4 +] [BCl3 and BrCl 3 ...

1 according to estimates 10l of seawater contains on the

1. According to estimates, 1.0L of seawater contains on the average 4.0x10 -9 g of gold. If gold is worth $390 per troy ounce and a troy ounce weighs 31.103 g , how many cubic meters of seawater would have a million doll ...

Dolomite is a mineral consisting of calcium carbonate and

Dolomite is a mineral consisting of calcium carbonate and magnesium carbonate. When dolomite is strongly heated, its carbonates decompose to their oxides (CaO and MgO) and carbon dioxide is expelled. (a) Write separate e ...

The following names are all incorrect draw the structure

The following names are all incorrect. Draw the structure represented by the incorrect name and give your drawing the correct name. (a) trisecbutylmethane (b) triisopropylmethane

Aerogel or solid smoke is a novel material that is made of

Aerogel or "solid smoke" is a novel material that is made of silicon dioxide, like glass, but is a thousand times less dense than glass because it is extremely porous. Material scientists at NASA's Jet Propulsion Laborat ...

Task 1design a hypothetical peptide for recombinant

Task 1 Design a hypothetical peptide for recombinant expression in the designated host organism (mammalian/plant/yeast/insect/worm) using your name as the amino acid sequence. For example, the amino acid sequence for Joh ...

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate