Biochemistry MCQ & Objective Questions
Biochemistry is a crucial subject for students aspiring to excel in their school exams and competitive tests. Understanding the biochemical processes that underpin life is essential for scoring well. Practicing MCQs and objective questions in Biochemistry not only enhances your grasp of the subject but also boosts your confidence during exams. Engaging with these practice questions helps in identifying important concepts and prepares you effectively for various assessments.
What You Will Practise Here
Fundamental concepts of biomolecules: carbohydrates, proteins, lipids, and nucleic acids.
Metabolic pathways: glycolysis, Krebs cycle, and oxidative phosphorylation.
Enzyme kinetics and regulation: understanding enzyme activity and factors affecting it.
Cellular respiration and photosynthesis: key processes in energy production.
Biochemical techniques: chromatography, electrophoresis, and spectrophotometry.
Genetic information flow: DNA replication, transcription, and translation.
Important biochemical equations and their applications in real-life scenarios.
Exam Relevance
Biochemistry is a significant part of the curriculum for CBSE, State Boards, NEET, and JEE. It often appears in the form of direct questions, application-based scenarios, and conceptual MCQs. Students can expect questions that assess their understanding of metabolic pathways, enzyme functions, and the role of biomolecules in living organisms. Familiarity with common question patterns, such as multiple-choice questions that require critical thinking, is essential for success in these exams.
Common Mistakes Students Make
Confusing the structures and functions of different biomolecules.
Misunderstanding metabolic pathways and their regulatory mechanisms.
Neglecting the importance of diagrams and flowcharts in explaining biochemical processes.
Overlooking the significance of enzyme kinetics in practical applications.
FAQs
Question: What are some effective ways to study Biochemistry for exams?Answer: Focus on understanding key concepts, practice MCQs regularly, and use diagrams to visualize processes.
Question: How can I improve my performance in Biochemistry MCQs?Answer: Regular practice of objective questions and reviewing common mistakes will enhance your exam readiness.
Start solving Biochemistry MCQs today to test your understanding and solidify your knowledge. Remember, consistent practice is the key to mastering this vital subject and achieving your academic goals!
Q. What is the structure of an antibody?
A.
Single polypeptide chain
B.
Two heavy and two light chains
C.
Three heavy chains
D.
Four light chains
Show solution
Solution
Antibodies are composed of two heavy chains and two light chains, forming a Y-shaped structure that allows for antigen binding.
Correct Answer:
B
— Two heavy and two light chains
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Q. What is the structure of DNA commonly described as?
A.
Single helix
B.
Double helix
C.
Triple helix
D.
Linear strand
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Solution
DNA is commonly described as a double helix, consisting of two strands wound around each other.
Correct Answer:
B
— Double helix
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Q. What is the sugar component of RNA?
A.
Deoxyribose
B.
Ribose
C.
Glucose
D.
Fructose
Show solution
Solution
The sugar component of RNA is ribose, which differs from deoxyribose found in DNA.
Correct Answer:
B
— Ribose
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Q. What is the term for the ability of antibodies to bind specifically to antigens?
A.
Affinity
B.
Specificity
C.
Cross-reactivity
D.
Neutralization
Show solution
Solution
Affinity refers to the strength of the interaction between an antibody and its specific antigen.
Correct Answer:
B
— Specificity
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Q. What is the term for the specific region on an antigen that is recognized by an antibody?
A.
Epitope
B.
Paratope
C.
Antibody site
D.
Antigenic determinant
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Solution
The specific region on an antigen that is recognized by an antibody is called an epitope.
Correct Answer:
A
— Epitope
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Q. What is the term for the specific region on an enzyme where the substrate binds?
A.
Active site
B.
Allosteric site
C.
Binding pocket
D.
Catalytic center
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Solution
The active site is the specific region on an enzyme where the substrate binds and the reaction occurs.
Correct Answer:
A
— Active site
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Q. What is the tertiary structure of a protein?
A.
The overall 3D shape of a single polypeptide chain
B.
The sequence of amino acids
C.
The arrangement of multiple polypeptide chains
D.
The interaction of the protein with other molecules
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Solution
The tertiary structure of a protein refers to the overall three-dimensional shape formed by the folding of a single polypeptide chain.
Correct Answer:
A
— The overall 3D shape of a single polypeptide chain
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Q. What is the typical charge of DNA molecules during gel electrophoresis?
A.
Positive
B.
Negative
C.
Neutral
D.
Variable
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Solution
DNA molecules have a negative charge due to their phosphate backbone, causing them to migrate towards the positive electrode.
Correct Answer:
B
— Negative
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Q. What is the typical length range of peptides?
A.
2 to 10 amino acids
B.
10 to 50 amino acids
C.
50 to 100 amino acids
D.
Over 100 amino acids
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Solution
Peptides typically consist of 2 to 50 amino acids, while proteins are generally larger.
Correct Answer:
B
— 10 to 50 amino acids
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Q. What is the typical mobile phase used in gas chromatography?
A.
Liquid solvent
B.
Gas
C.
Solid adsorbent
D.
Aqueous solution
Show solution
Solution
The mobile phase in gas chromatography is typically a gas, often helium or nitrogen.
Correct Answer:
B
— Gas
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Q. What is the typical number of cycles in a standard PCR protocol?
A.
5-10 cycles
B.
15-30 cycles
C.
25-40 cycles
D.
50-100 cycles
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Solution
A standard PCR protocol typically involves 25-40 cycles to achieve sufficient amplification.
Correct Answer:
C
— 25-40 cycles
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Q. What is the typical pressure range for HPLC systems?
A.
0-10 psi
B.
10-100 psi
C.
100-5000 psi
D.
5000-10000 psi
Show solution
Solution
The typical pressure range for HPLC systems is 100-5000 psi, which is necessary for efficient separation.
Correct Answer:
C
— 100-5000 psi
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Q. What is the typical range of chemical shifts for protons in organic compounds?
A.
0-5 ppm
B.
0-10 ppm
C.
0-15 ppm
D.
0-20 ppm
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Solution
Protons in organic compounds typically exhibit chemical shifts in the range of 0-12 ppm.
Correct Answer:
B
— 0-10 ppm
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Q. What is the typical range of wavelengths measured in FTIR spectroscopy?
A.
100-400 nm
B.
400-700 nm
C.
4000-400 cm-1
D.
700-1000 nm
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Solution
FTIR spectroscopy typically measures wavelengths in the range of 4000-400 cm-1, corresponding to infrared light.
Correct Answer:
C
— 4000-400 cm-1
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Q. What is the typical temperature range for the column in gas chromatography?
A.
0-50°C
B.
50-300°C
C.
300-500°C
D.
Above 500°C
Show solution
Solution
The typical temperature range for the column in gas chromatography is 50-300°C.
Correct Answer:
B
— 50-300°C
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Q. What mineral deficiency can lead to goiter?
A.
Calcium
B.
Iodine
C.
Iron
D.
Zinc
Show solution
Solution
Iodine deficiency can lead to goiter, which is an enlargement of the thyroid gland.
Correct Answer:
B
— Iodine
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Q. What mineral helps regulate fluid balance in the body?
A.
Chloride
B.
Iron
C.
Copper
D.
Selenium
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Solution
Chloride plays a key role in maintaining fluid balance and is an essential electrolyte.
Correct Answer:
A
— Chloride
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Q. What mineral is essential for the formation of hemoglobin?
A.
Calcium
B.
Iron
C.
Zinc
D.
Magnesium
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Solution
Iron is a key component of hemoglobin, which is necessary for oxygen transport in the blood.
Correct Answer:
B
— Iron
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Q. What mineral is known for its role in muscle contraction?
A.
Sodium
B.
Iron
C.
Calcium
D.
Phosphorus
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Solution
Calcium is essential for muscle contraction as it interacts with proteins in muscle cells.
Correct Answer:
C
— Calcium
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Q. What mineral is primarily involved in energy metabolism?
A.
Magnesium
B.
Calcium
C.
Iron
D.
Sodium
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Solution
Magnesium is crucial for energy production as it acts as a cofactor in many enzymatic reactions.
Correct Answer:
A
— Magnesium
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Q. What property distinguishes polar amino acids from nonpolar amino acids?
A.
Presence of a carboxyl group
B.
Presence of a hydroxyl or amine group in the side chain
C.
Presence of sulfur in the side chain
D.
Presence of a benzene ring
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Solution
Polar amino acids have side chains that contain hydroxyl (-OH) or amine (-NH2) groups, making them hydrophilic.
Correct Answer:
B
— Presence of a hydroxyl or amine group in the side chain
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Q. What role do antibodies play in the immune response?
A.
Destroy pathogens directly
B.
Neutralize toxins
C.
Enhance phagocytosis
D.
All of the above
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Solution
Antibodies can destroy pathogens, neutralize toxins, and enhance phagocytosis, making them crucial in the immune response.
Correct Answer:
D
— All of the above
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Q. What role do chaperone proteins play in protein stability?
A.
They degrade misfolded proteins
B.
They assist in proper folding
C.
They enhance enzymatic activity
D.
They transport proteins
Show solution
Solution
Chaperone proteins assist in the proper folding of other proteins, enhancing their stability.
Correct Answer:
B
— They assist in proper folding
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Q. What role do chaperone proteins play in protein structure?
A.
They catalyze reactions
B.
They assist in protein folding
C.
They provide structural support
D.
They transport proteins
Show solution
Solution
Chaperone proteins assist in the proper folding of other proteins, preventing misfolding and aggregation.
Correct Answer:
B
— They assist in protein folding
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Q. What role do kinases play in cell signaling?
A.
They inhibit signaling pathways
B.
They phosphorylate proteins
C.
They transport molecules across membranes
D.
They degrade signaling molecules
Show solution
Solution
Kinases are enzymes that phosphorylate proteins, which is a key mechanism in regulating cell signaling.
Correct Answer:
B
— They phosphorylate proteins
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Q. What role do membrane proteins play in cellular functions?
A.
Energy storage
B.
Transport and signaling
C.
Structural support
D.
DNA replication
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Solution
Membrane proteins facilitate transport across the membrane and are involved in signaling pathways.
Correct Answer:
B
— Transport and signaling
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Q. What role do ribosomes play in protein synthesis?
A.
They synthesize mRNA
B.
They provide the site for translation
C.
They replicate DNA
D.
They splice introns from pre-mRNA
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Solution
Ribosomes provide the site for translation, where proteins are synthesized.
Correct Answer:
B
— They provide the site for translation
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Q. What role do ribosomes play in the genetic code?
A.
Transcription
B.
Translation
C.
Replication
D.
Mutation
Show solution
Solution
Ribosomes are the cellular machinery that translate mRNA codons into amino acids during protein synthesis.
Correct Answer:
B
— Translation
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Q. What role do transcription factors play in gene expression?
A.
They degrade RNA
B.
They enhance or inhibit transcription
C.
They replicate DNA
D.
They splice RNA
Show solution
Solution
Transcription factors are proteins that bind to specific DNA sequences to enhance or inhibit the transcription of genes.
Correct Answer:
B
— They enhance or inhibit transcription
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Q. What role does cAMP play in the regulation of the lac operon?
A.
It inhibits transcription
B.
It enhances RNA polymerase binding
C.
It degrades mRNA
D.
It activates the repressor
Show solution
Solution
cAMP enhances the binding of RNA polymerase to the promoter of the lac operon, facilitating transcription when glucose levels are low.
Correct Answer:
B
— It enhances RNA polymerase binding
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