Amin Amino axit và Protein Practice Questions
THPT (Vietnam) · THPT Hóa học · 148 free MCQs with instant results and detailed explanations.
148
Total
46
Easy
76
Medium
26
Hard
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Sample Questions from Amin Amino axit và Protein
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Q1
Easy
What is the general structure of an amino acid?
A.
A central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group.
B.
A carbon atom bonded to two hydroxyl groups and a nitrogen atom.
C.
A nitrogen atom bonded to a carboxyl group and two hydrogen atoms.
D.
A carbon atom bonded to a phosphate group and two amino groups.
Show Answer & Explanation
Correct Answer: A
The general structure of an amino acid consists of a central carbon atom (alpha carbon) attached to an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a variable R group (side chain). This structure is fundamental to all amino acids.
Q2
Easy
Which of the following amino acids is classified as essential for human health?
A.
Alanine
B.
Lysine
C.
Glutamic acid
D.
Tyrosine
Show Answer & Explanation
Correct Answer: B
Lysine is classified as an essential amino acid, meaning it must be obtained through diet as the body cannot synthesize it. In contrast, alanine, glutamic acid, and tyrosine are non-essential amino acids.
Q3
Easy
Which functional group is characteristic of all amino acids?
A.
Aldehyde group
B.
Carboxyl group
C.
Hydroxyl group
D.
Phosphate group
Show Answer & Explanation
Correct Answer: B
The carboxyl group (-COOH) is a characteristic functional group of all amino acids. It is responsible for their acidic properties and is present in every amino acid's structure.
Q4
Medium
What type of reaction occurs when amino acids are linked together to form a protein?
A.
Hydrolysis
B.
Dehydration synthesis
C.
Redox reaction
D.
Substitution reaction
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Correct Answer: B
The formation of proteins from amino acids involves dehydration synthesis, where water is released as the amino acids bond together.
Q5
Medium
Which of the following amino acids is classified as essential for human dietary needs?
A.
Glycine
B.
Lysine
C.
Alanine
D.
Serine
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Correct Answer: B
Lysine is an essential amino acid that cannot be synthesized by the human body and must be obtained through diet.
Q6
Medium
In a peptide bond, which two functional groups of amino acids are involved?
A.
Amine and carboxylic acid
B.
Amine and hydroxyl
C.
Carboxylic acid and aldehyde
D.
Hydroxyl and carbonyl
Show Answer & Explanation
Correct Answer: A
Peptide bonds are formed between the amine group of one amino acid and the carboxylic acid group of another, releasing water.
Q7
Medium
What is the role of proteins in biological systems?
A.
Store genetic information
B.
Catalyze biochemical reactions
C.
Transport oxygen in the bloodstream
D.
Provide structural support exclusively
Show Answer & Explanation
Correct Answer: B
Proteins function as enzymes that catalyze biochemical reactions, facilitating various metabolic processes in living organisms.
Q8
Hard
Which of the following amino acids is essential for human nutrition and cannot be synthesized by the body?
A.
Glutamic acid
B.
Lysine
C.
Alanine
D.
Serine
Show Answer & Explanation
Correct Answer: B
Lysine is one of the nine essential amino acids for humans, meaning it must be obtained through diet as the body cannot synthesize it. In contrast, glutamic acid, alanine, and serine can be produced by the body.
Q9
Hard
A scientist is studying the enzymatic activity of a protein that requires the amino acid methionine for its active site. What is the role of methionine in this context?
A.
It serves as a substrate for the enzyme.
B.
It stabilizes the enzyme's tertiary structure.
C.
It acts as a coenzyme.
D.
It is necessary for the enzyme's catalytic activity.
Show Answer & Explanation
Correct Answer: D
Methionine plays a crucial role in the active site of the protein, directly involved in the enzyme's catalytic activity. Without methionine, the enzyme would not function properly, unlike the other options which describe different roles.
Q10
Hard
Which of the following amino acids contains a sulfur atom in its side chain?
A.
Methionine
B.
Glutamine
C.
Asparagine
D.
Serine
Show Answer & Explanation
Correct Answer: A
Methionine is the only amino acid listed that contains a sulfur atom in its side chain. This is significant as it plays a role in protein structure and function.
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Amin Amino axit và Protein — THPT (Vietnam) THPT Hóa học Practice Questions Online
This page contains 148 practice MCQs for the chapter Amin Amino axit và Protein in THPT (Vietnam) THPT Hóa học. The questions are organized by difficulty — 46 easy, 76 medium, 26 hard — so you can choose the right level for your preparation.
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