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Questions and Answers
What is the primary function of membranes in biological systems?
What is the primary function of membranes in biological systems?
- To synthesize proteins and carbohydrates
- To facilitate the exchange of materials between the internal and external environment
- To provide structural support to the cell
- To act as barriers controlling the exchange of materials between the internal and external environment (correct)
What is the characteristic of unsaturated fatty acids in phospholipids?
What is the characteristic of unsaturated fatty acids in phospholipids?
- They have no kinks in the tail
- They have a polar head
- They have kinks in the tail (correct)
- They have a hydrophilic tail
What is the result of the amphipathic nature of phospholipids?
What is the result of the amphipathic nature of phospholipids?
- The hydrophilic head is non-polar
- The hydrophilic head points inwards and the hydrophobic tail points outwards
- The hydrophobic tail is polar
- The hydrophilic head points outwards and the hydrophobic tail points inwards (correct)
Which of the following molecules can easily pass through the lipid bilayer?
Which of the following molecules can easily pass through the lipid bilayer?
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What is the process by which molecules move down a concentration gradient?
What is the process by which molecules move down a concentration gradient?
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What is the direction of oxygen diffusion in the human body?
What is the direction of oxygen diffusion in the human body?
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