Sel Practice Questions
UN (Indonesia) · UN Biologi · 136 free MCQs with instant results and detailed explanations.
136
Total
40
Easy
68
Medium
28
Hard
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Sample Questions from Sel
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Q1
Easy
Which of the following is the function of the cell membrane?
A.
To provide energy to the cell
B.
To protect the cell from harmful substances
C.
To control the movement of substances in and out of the cell
D.
To store genetic information
Show Answer & Explanation
Correct Answer: C
The cell membrane regulates what enters and exits the cell, thus controlling the internal environment.
Q2
Easy
What is the primary component of the cell wall in plant cells?
A.
Cellulose
B.
Chitin
C.
Protein
D.
Lipid
Show Answer & Explanation
Correct Answer: A
Cellulose is the main structural component of the cell wall, providing rigidity and strength to plant cells.
Q3
Easy
Which part of the cell is responsible for regulating what enters and exits the cell?
A.
Nucleus
B.
Cell wall
C.
Cell membrane
D.
Cytoplasm
Show Answer & Explanation
Correct Answer: C
The cell membrane, also known as the plasma membrane, is responsible for regulating the movement of substances in and out of the cell, thereby maintaining homeostasis.
Q4
Medium
Which cellular structure is primarily responsible for regulating the movement of substances in and out of the cell?
A.
Nucleus
B.
Cell membrane
C.
Mitochondria
D.
Ribosome
Show Answer & Explanation
Correct Answer: B
The cell membrane is a selectively permeable barrier that controls the entry and exit of substances, making it critical for maintaining homeostasis.
Q5
Medium
What is the primary function of ribosomes within a cell?
A.
Energy production
B.
Protein synthesis
C.
Genetic material storage
D.
Cell division
Show Answer & Explanation
Correct Answer: B
Ribosomes are the cellular machinery responsible for synthesizing proteins by translating messenger RNA into polypeptide chains.
Q6
Medium
If a plant cell is placed in a hypertonic solution, what is the expected outcome?
A.
The cell will swell and burst.
B.
The cell will remain unchanged.
C.
The cell will shrink or undergo plasmolysis.
D.
The cell will absorb water and grow larger.
Show Answer & Explanation
Correct Answer: C
In a hypertonic solution, water moves out of the plant cell, causing it to shrink or undergo plasmolysis due to the loss of turgor pressure.
Q7
Medium
Which of the following statements about mitochondria is true?
A.
They are the site of photosynthesis.
B.
They produce ATP through cellular respiration.
C.
They are involved in protein synthesis.
D.
They are found only in plant cells.
Show Answer & Explanation
Correct Answer: B
Mitochondria are known as the powerhouse of the cell because they generate ATP, which is the energy currency of cells, through the process of cellular respiration.
Q8
Hard
Which of the following organelles is primarily responsible for ATP production in eukaryotic cells?
A.
Chloroplast
B.
Mitochondria
C.
Endoplasmic Reticulum
D.
Golgi Apparatus
Show Answer & Explanation
Correct Answer: B
Mitochondria are known as the powerhouses of the cell because they generate ATP through aerobic respiration, making option B the correct choice.
Q9
Hard
In the process of cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?
A.
NAD+
B.
Oxygen
C.
Carbon dioxide
D.
Glucose
Show Answer & Explanation
Correct Answer: B
Oxygen is the final electron acceptor in the electron transport chain, allowing for the production of water and enabling the continuation of ATP synthesis. Without oxygen, the chain would halt, significantly impacting energy production.
Q10
Hard
A specific type of cell division is crucial for the development of gametes in humans. What is the process called, and what is a key outcome of this process?
A.
Mitosis; two identical diploid cells
B.
Meiosis; four unique haploid cells
C.
Binary fission; two identical haploid cells
D.
Budding; one diploid cell
Show Answer & Explanation
Correct Answer: B
Meiosis is the process of cell division that produces four genetically distinct haploid cells from one diploid cell. This is essential for gamete formation, as it ensures genetic diversity and reduces the chromosome number by half.
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Sel — UN (Indonesia) UN Biologi Practice Questions Online
This page contains 136 practice MCQs for the chapter Sel in UN (Indonesia) UN Biologi. The questions are organized by difficulty — 40 easy, 68 medium, 28 hard — so you can choose the right level for your preparation.
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