Which of these is an inclusion, NOT an organelle?
cilia
melanin
microtubule
lysosome
The Correct Answer is B
A. Cilia: Cilia are motile projections of the plasma membrane composed of microtubules. They are considered organelles because they perform a specific cellular function, such as moving fluids across the cell surface.
B. Melanin: Melanin is a pigment stored in granules within the cell. It is classified as an inclusion because it is a non-living, stored substance rather than a membrane-bound organelle that carries out active cellular processes.
C. Microtubule: Microtubules are cytoskeletal components that provide structural support, intracellular transport, and cell division. They are part of the organelle system.
D. Lysosome: Lysosomes are membrane-bound organelles that contain digestive enzymes used to break down cellular waste, pathogens, and damaged organelles, performing essential cellular functions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Superior: The heart is located above the stomach in the thoracic cavity, making it superior in relation to the stomach, which is in the abdominal cavity.
B. Distal: Distal refers to a position farther from the point of attachment or origin, usually in limbs, and is not appropriate for describing the heart-stomach relationship.
C. Inferior: Inferior means below another structure, which applies to the stomach relative to the heart, not the other way around.
D. Proximal: Proximal refers to a location closer to the point of attachment or origin, typically used for limbs, and does not describe the heart’s position relative to the stomach.
Correct Answer is C
Explanation
A. Triglyceride: Triglycerides are composed of glycerol and three fatty acids and serve as energy storage, not chains of amino acids.
B. Nucleic acid: Nucleic acids, such as DNA and RNA, are polymers of nucleotides, not amino acids.
C. Protein: Proteins are long chains of amino acids linked by peptide bonds. Their sequence and structure determine their function in enzymes, structural support, transport, and signaling.
D. Polysaccharide: Polysaccharides are long chains of monosaccharides (sugars) and function mainly in energy storage and structural support, not as amino acid chains.
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