Which of the following describes how regions of phospholipids are arranged in the cell membrane?Choose 1 answer:Choose 1 answer:(Choice A, Checked) Hydrophobic fatty acid regions are positioned toward polar environments.AHydrophobic fatty acid regions are positioned toward polar environments.(Choice B) Hydrophilic phosphate regions face each other within the interior of the cell membrane.BHydrophilic phosphate regions face each other within the interior of the cell membrane.(Choice C) Hydrophilic phosphate regions are positioned toward nonpolar environments.CHydrophilic phosphate regions are positioned toward nonpolar environments.(Choice D) Hydrophobic fatty acid regions face each other within the interior of the cell membrane.DHydrophobic fatty acid regions face each other within the interior of the cell membrane.
Question
Which of the following describes how regions of phospholipids are arranged in the cell membrane?Choose 1 answer:Choose 1 answer:(Choice A, Checked) Hydrophobic fatty acid regions are positioned toward polar environments.AHydrophobic fatty acid regions are positioned toward polar environments.(Choice B) Hydrophilic phosphate regions face each other within the interior of the cell membrane.BHydrophilic phosphate regions face each other within the interior of the cell membrane.(Choice C) Hydrophilic phosphate regions are positioned toward nonpolar environments.CHydrophilic phosphate regions are positioned toward nonpolar environments.(Choice D) Hydrophobic fatty acid regions face each other within the interior of the cell membrane.DHydrophobic fatty acid regions face each other within the interior of the cell membrane.
Solution
The correct answer is (Choice D) Hydrophobic fatty acid regions face each other within the interior of the cell membrane.
Here's why:
The cell membrane is composed of a phospholipid bilayer. Each phospholipid molecule has a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails.
In the cell membrane, the hydrophilic heads are attracted to the watery environments both inside and outside the cell, so they position themselves towards these areas. This means the hydrophilic phosphate regions are on the exterior of the cell membrane, facing the watery environments.
On the other hand, the hydrophobic tails are repelled by these watery environments, so they position themselves away from them. This means the hydrophobic fatty acid regions face each other within the interior of the cell membrane, creating a nonpolar environment within the core of the membrane.
So, the arrangement of phospholipids in the cell membrane is such that the hydrophilic heads face outwards towards the watery environments, and the hydrophobic tails face inwards, away from the water.
Similar Questions
Which statements describe the characteristics of phospholipids?Question 13Answera.Part of the molecule is hydrophobic.b.They are the primary components of cell membranes.c.They form a bilayer when placed in water.d.The tails of the molecule are hydrophilic.e.The tails congregate in the middle.
Which type of movement is LEAST likely for a phospholipid in the cell membrane? [2 marks]A flexion of the carbon chain tailsB flip-flopC lateral diffusionD rotationE bumping into proteins
Which of the following is false about the phospholipids in the cell membrane?Phospholipids of the bilayer have one fatty acid and a phosphate group.Phospholipids of the bilayer have two fatty acids and a phosphate group.Phospholipids of the bilayer always have hydrophilic phosphate heads.Phospholipids of the bilayer always have a hydrophobic tail.
4. Which statement about membrane phospholipids is not true?a. They associate to form bilayers.b. They have hydrophobic “tails.”c. They have hydrophilic “heads.”d. They give the membrane fluidity.e. They flip-flop readily from one side of the membrane to the other
Cell membranes are composed mainly of _____.Multiple choice question.phospholipidscarbohydratesnucleic acids
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