Addition of Biuret Reagent: Organic Chemistry Quiz

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Questions and Answers

Which of the given compounds is a polyunsaturated fatty acid?

C (correct)

Which of the substances has an ester bond?

D (correct)

Which compound is likely to be found in biological membranes?

D (correct)

How many peptide bonds are present in the given polypeptide structure?

eight Signup and view all the answers

Which of the given substances is a trans fatty acid?

B Signup and view all the answers

Which compound will give positive results to the Salkowski test?

A Signup and view all the answers

How many amino acid residues are present in the given polypeptide structure?

eight Signup and view all the answers

Which of the given substances is an omega-9 fatty acid?

B Signup and view all the answers

Which type of lipid has a high content of saturated fats?

Coconut oil Signup and view all the answers

What is the primary function of the Salkowski's test in lipid analysis?

Detecting the presence of cholesterol Signup and view all the answers

Which test detects the presence of peptide bonds in proteins?

Biuret test Signup and view all the answers

Which lipid is commonly found in biological membranes?

Cholesterol Signup and view all the answers

What is the characteristic of a lipid that reacts slowly with iodine in the iodine test?

High level of saturation Signup and view all the answers

What is the main function of the Ninhydrin test?

To detect the presence of free amino groups in amino acids and peptides Signup and view all the answers

Which of the following is NOT a characteristic of a triglyceride?

Presence of amino acids Signup and view all the answers

Which sample is expected to give a negative result in the Hopkins-Cole test?

Tryptophan Signup and view all the answers

What is the main function of the Millon's test?

To detect the presence of phenolic compounds Signup and view all the answers

Which test is used to detect the presence of glycerol in lipids?

Acrolein test Signup and view all the answers

Which of the following lipids is classified as a sterol?

Cholesterol Signup and view all the answers

Which of the following can cause the denaturation of proteins by disrupting their native three-dimensional structure?

All of the above Signup and view all the answers

What is the primary function of the Liebermann-Burchard test in lipid analysis?

Detecting the presence of cholesterol Signup and view all the answers

Which sample is expected to remain soluble and not undergo significant denaturation in the heat denaturation of proteins?

None of the above Signup and view all the answers

Which test is used to detect the presence of SH groups in proteins?

Test for SH groups Signup and view all the answers

Which sample is expected to give a positive result in the test for SH groups?

Both a and c Signup and view all the answers

Study Notes

Structures and Compounds

A is a steroid derivative.
B is an omega-9 fatty acid.
C is a polyunsaturated fatty acid.
D is a diglyceride derivative.
18:2, Δ!,$ is an omega-6 fatty acid.
Ester bonds are present in compound A.
The saturated fatty acid is not specified.
Compound B will test positive for the acrolein test.
Compound A will give positive results to the Salkowski test.
Compound C will decolorize iodine the fastest.
There are no trans fatty acids in the given structures.
Compound B is a cis fatty acid.
Compound A is likely a component of biological membranes.
Compound D will generate the greatest number of sodium salt or soap molecules upon treatment with concentrated sodium hydroxide.

Polypeptide

The polypeptide structure has 9 peptide bonds.
The polypeptide structure has 10 amino acid residues.

Lipid Tests

Diethyl ether is used in the solubility test for lipids.
Coconut oil is a triglyceride with a high content of saturated fats.
Coconut oil reacted the slowest with iodine, indicating a high level of saturation.
The Liebermann-Burchard test detects the presence of cholesterol based on the formation of a reddish color solution.
Cholesterol gives a positive result in the Liebermann-Burchard test.
The Acrolein test detects the presence of glycerol by producing a pungent smell upon heating.

Protein Tests

The Biuret test detects the presence of peptide bonds.
Gelatin gave a negative result in the Biuret test, indicating the absence of peptide bonds.
The Ninhydrin test detects the presence of free amino groups in amino acids and peptides.
The Hopkins-Cole test detects the presence of tryptophan residues.
Casein gave a negative result in the Hopkins-Cole test, indicating the absence of tryptophan residues.
The Millon's test detects phenolic compounds where the hydroxyl group is directly attached to the benzene ring.
The test for SH groups detects the presence of cysteine residues.
Casein is expected to give a positive result in the test for SH groups.

Protein Denaturation

Heat, chemical reagents, and organic solvents can cause protein denaturation.
Egg albumin is expected to remain soluble and not undergo significant denaturation in heat denaturation.

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Description

Test your understanding of the addition of Biuret reagent with these questions, focusing on the chemical structures and reactions involved. Evaluate your knowledge of organic chemistry and molecular interactions.