Practice Question
The cellular membrane consists of a bilayer of which substances?
Answer Choices:
Correct Answer:
Phospholipids.
Rationale:
The cellular membrane (or plasma membrane) is primarily composed of a phospholipid bilayer. This bilayer forms a semi-permeable barrier, with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails facing inward, allowing selective movement of substances in and out of the cell.
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This question is from Biology~2025 Exam 1 which contains 30 questions.
More Questions from This Exam
On what part of a light microscope is the slide placed?
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A. Arm.
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Answer Choices:
A. Organ.
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What part of a plant cell acts as a barrier and provides support to the cell?
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A. Cell membrane.
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Which genetic descriptor refers to an organism's actual appearance?
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A. Phenotype.
B. Genotype.
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Answer Choices:
A. Mitosis.
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C. Fission.
D. Meiosis.
Question Details
- Category: HESI A2
- Subcategory: Comprehensive HESI A2 Exam(s) Series
- Domain: Comprehensive Hesi A2~2025
- Answer Choices: 4