Biomolecules Practice Questions
HSC/SSC (Bangladesh) · HSC Biology · 144 free MCQs with instant results and detailed explanations.
144
Total
40
Easy
78
Medium
26
Hard
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Sample Questions from Biomolecules
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following biomolecules is primarily responsible for storing genetic information?
A.
DNA
B.
Proteins
C.
Carbohydrates
D.
Lipids
Show Answer & Explanation
Correct Answer: A
DNA (Deoxyribonucleic acid) is the molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms, making it the primary storage of genetic information.
Q2
Easy
Which of the following is a characteristic of enzymes?
A.
They can be used up in a reaction.
B.
They lower the activation energy of reactions.
C.
They are always proteins.
D.
They work at any temperature.
Show Answer & Explanation
Correct Answer: B
Enzymes lower the activation energy required for a reaction to occur, thus speeding up biochemical reactions without being consumed in the process. They are typically proteins, but some RNA molecules also have catalytic activity.
Q3
Easy
What is the primary function of carbohydrates in living organisms?
A.
Energy storage
B.
Genetic information
C.
Hormone production
D.
Immune response
Show Answer & Explanation
Correct Answer: A
Carbohydrates are primarily used by living organisms for energy storage and supply. They can be broken down to release glucose, which is a key energy source for cells.
Q4
Medium
Which of the following biomolecules is primarily responsible for storing genetic information?
A.
Proteins
B.
Nucleic acids
C.
Carbohydrates
D.
Lipids
Show Answer & Explanation
Correct Answer: B
Nucleic acids, such as DNA and RNA, are the biomolecules that store and transmit genetic information in living organisms.
Q5
Medium
Which of the following statements accurately describes enzymes?
A.
Enzymes are consumed during the reactions they catalyze.
B.
Enzymes increase the activation energy required for reactions.
C.
Enzymes lower the activation energy of biochemical reactions.
D.
Enzymes are only effective in extreme temperatures.
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Correct Answer: C
Enzymes act as catalysts by lowering the activation energy of reactions, thereby increasing the rate of the reactions without being consumed.
Q6
Medium
Which carbohydrate is primarily used as a quick source of energy in living organisms?
A.
Cellulose
B.
Glycogen
C.
Starch
D.
Glucose
Show Answer & Explanation
Correct Answer: D
Glucose is a simple sugar and the primary energy source for cells, providing immediate energy as it is easily metabolized.
Q7
Medium
Which type of lipid is most abundant in biological membranes?
A.
Steroids
B.
Phospholipids
C.
Triglycerides
D.
Waxes
Show Answer & Explanation
Correct Answer: B
Phospholipids are the main structural components of cell membranes, forming a bilayer that is essential for membrane integrity and function.
Q8
Hard
Which of the following biomolecules is primarily responsible for storing genetic information in cells?
A.
Proteins
B.
Carbohydrates
C.
Nucleic acids
D.
Lipids
Show Answer & Explanation
Correct Answer: C
Nucleic acids, such as DNA and RNA, are the biomolecules that store and transmit genetic information in living organisms. They are essential for the coding, decoding, regulation, and expression of genes.
Q9
Hard
If a sample of a protein shows a molecular weight of 50 kDa and consists of 500 amino acids, what is the average molecular weight of each amino acid in this protein?
A.
100 Da
B.
150 Da
C.
200 Da
D.
250 Da
Show Answer & Explanation
Correct Answer: A
The average molecular weight of an amino acid can be calculated by dividing the total molecular weight of the protein (50 kDa or 50000 Da) by the number of amino acids (500). Therefore, 50000 Da / 500 amino acids = 100 Da per amino acid.
Q10
Hard
Which of the following biomolecules is primarily responsible for the structure and function of cell membranes?
A.
Carbohydrates
B.
Proteins
C.
Nucleic Acids
D.
Lipids
Show Answer & Explanation
Correct Answer: D
Lipids, particularly phospholipids, form the fundamental structure of cell membranes, creating a bilayer that separates the interior of the cell from the external environment.
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Biomolecules — HSC/SSC (Bangladesh) HSC Biology Practice Questions Online
This page contains 144 practice MCQs for the chapter Biomolecules in HSC/SSC (Bangladesh) HSC Biology. The questions are organized by difficulty — 40 easy, 78 medium, 26 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.