Lipid-soluble substances diffuse easily through the plasma membrane, while lipid-insoluble substances must use channel proteins.True false question.TrueFalse

Passive membrane transport processes:move solutes down their concentration gradients in the absence of energyalways require the use of channel or carrier proteins to move solutes across the plasma membraneonly transport lipid-soluble solutesrequire the input of energy to move a solute across the plasma membrane

It is difficult for many molecules to diffuse through the phospholipid bilayer of a plasma membrane without the aid of a membrane transport protein. A molecule that succeeds in doing this is likely to be

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.

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.

During reabsorption, water passes through what protein channels within a plasma membrane?Multiple choice question.Voltage-gated channelsAquaporinsProtein channelsSodium channels