Multiple Choice
Which organelle is primarily responsible for detoxification processes in liver cells?
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2. Cell Chemistry & Cell Components
Introduction to Eukaryotic Organelles
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Which of the following structures is a component of a myofibril in eukaryotic muscle cells?
A
Mitochondrion
B
Sarcomere
C
Nucleolus
D
Golgi apparatus
Verified step by step guidance1
Understand the context: Myofibrils are specialized structures found in eukaryotic muscle cells that are responsible for contraction. They are composed of repeating units called sarcomeres, which are the functional units of muscle contraction.
Eliminate unrelated options: Mitochondrion, nucleolus, and Golgi apparatus are organelles found in cells, but they are not components of myofibrils. Mitochondria are involved in energy production, the nucleolus is involved in ribosome synthesis, and the Golgi apparatus is involved in protein modification and transport.
Focus on the correct structure: Sarcomeres are the repeating units within myofibrils. They consist of organized arrangements of actin (thin filaments) and myosin (thick filaments), which interact during muscle contraction.
Recall the anatomy of a sarcomere: Sarcomeres are bordered by Z-discs, which anchor the actin filaments. The arrangement of actin and myosin creates the striated appearance of skeletal and cardiac muscle.
Conclude: The sarcomere is the correct answer because it is the structural and functional unit of a myofibril, directly involved in muscle contraction.
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