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

You are provided with 200ml of 05moll-1 hydrochloric acid

You are provided with 200ml of 0.5molL-1 hydrochloric acid in which has been dissolved in a small quantity of anhydrous sodium carbonate. When titrated, 25ml of this solution requires 20.5ml of 0.5molL-1 sodium hydroxide ...

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?

How many grams of silver nitrate are required to produce

How many grams of silver nitrate are required to produce 44.00 g of aluminum nitrate? 6AgNO 3   +  Al 2 (SO 4 ) 3   →  3Ag 2 SO 4   +  2Al(NO 3 ) 3

Chemistry practice examdirections on actual exam the exam

Chemistry Practice Exam Directions on actual Exam: The exam consists of 2 sections (Chemical Bonding and Geometry and IMFs. Each multiple choice question is worth 4.33 points. You are allowed to use a scientific (nonprog ...

Analyzed individually two solutes have retention times of

Analyzed individually, two solutes have retention times of 17 s and 21 s with peak widths at half-maximum (w1/2) of 1.9 s and 2.8 s, respectively. If the two solutes are analyzed together, what would be the resolution on ...

A 010 m fes04 aq solution is electrolyzed between a

A 0.10 M FeS04 (aq) solution is electrolyzed between a magnesium cathode and a platinum anode with a current density of 1.50 mA cm-2.The hydrogen over potential is 0.60 V. What will be the concentration of Fe2+ions when ...

Please create 1 synthesis you get to choose any starting

Please create 1 synthesis (you get to choose any starting material) but you should demonstrate all of the following reactions and the product: oxymercuration +hydroboration+ addition+ KMnO4 + hydrolysis + LDA . reactions ...

How many moles of carbon dioxide are produced when 193 mol

How many moles of carbon dioxide are produced when 19.3 mol of propane gas is burned in excess oxygen? C3H8+5O2=3CO2+4H2O? Please show work.

Using the debye-hucket equation calculate the activity

Using the Debye-Hucket equation, calculate the activity coefficients for the acidic and basic forms of bromocresol green, HX- and X2-, for a solution with an ionic strength of u=0.1M.

Subject chemistry amp physics please answer all questions

(Subject: Chemistry & Physics) Please answer all questions. Please be clear. Short answers are fine. 3-4 sentences. 1) If a feather and a lead ball are dropped from 1000m in AIR (vacuum) , will they hit the ground at the ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen