Which of the following pass freely and easily through the plasma membrane?Multiple select question.charged moleculessmall moleculeslarge moleculeslipid-soluble moleculeswater (through aquaporins)
Question
Which of the following pass freely and easily through the plasma membrane?Multiple select question.charged moleculessmall moleculeslarge moleculeslipid-soluble moleculeswater (through aquaporins)
Solution
The plasma membrane, also known as the cell membrane, is selectively permeable. This means it allows certain molecules to pass through while blocking others. Here are the molecules from your list that can pass freely and easily through the plasma membrane:
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Small molecules: Small, non-polar molecules like oxygen and carbon dioxide can easily pass through the plasma membrane. They do this by diffusing across the membrane down their concentration gradient.
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Lipid-soluble molecules: The plasma membrane is made up of a lipid bilayer. Therefore, lipid-soluble molecules, or lipophilic molecules, can easily pass through. These include molecules like steroids and other fat-soluble vitamins.
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Water (through aquaporins): While water is a polar molecule and cannot easily pass through the lipid bilayer of the plasma membrane, cells have special proteins called aquaporins that allow water molecules to pass through.
Charged molecules and large molecules generally cannot pass freely through the plasma membrane. They require special mechanisms like transport proteins to help them cross the membrane.
Similar Questions
_______ _______ _______ molecules can pass freely through the plasma membrane.Group of answer choicesSmall uncharged nonpolarLarge charged polarLarge charged nonpolarLarge uncharged polarSmall charged nonpolar
Which of these molecules is correctly matched with its method of movement through the cell membrane?Multiple ChoiceGlucose and amino acid molecules — pass through membrane channels.Large, water-soluble molecules — transported by carrier-mediated processes.All of the choices are correctly paired.Lipid-soluble molecules — pass through membrane channels.Small, water-soluble molecules (ions) — dissolve in double phospholipid layer.
During reabsorption, water passes through what protein channels within a plasma membrane?Multiple choice question.Voltage-gated channelsAquaporinsProtein channelsSodium channels
Aquaporins are channels that allow to travel across plasma membranes.
This question has two parts.Part A. Which structure or molecule is responsible for transporting substances across the plasma membrane if they cannot enter through simple diffusion?Select one:a.Spindle fibersb.Cholesterolc.Proteinsd.CarbohydratesQUESTION 8Question textPart B. Which statement supports your answer to Part A?Select one:a.Carbohydrates act as carriers to transport large particles through the membrane.b.Cholesterol molecules can be formed into openings for active transport.c.Protein molecules form pores that allow substances to pass through.d.Spindle fibers stretch from the outside to the inside of the membrane to allow passage of substances.
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