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.

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

Select a true statement about active transportIt takes place in both directionsIt occurs without the help of carrier proteinsIt allows all transmissible molecules to pass through membraneNone of the above

Molecules move through the plasma membrane in different ways depending on their chemical composition. The semi-permeable nature of the plasma membrane allows some molecules to move through easily, while others require the assistance of a transport protein or cellular energy.What method of transport is used for small, polar molecules?Elimination ToolSelect one answerASimple diffusion.BFacilitated diffusion.CActive transport.DOsmosis.

The type of membrane transport that involves the ingestion of solid particles by vesicle formation is __________.Multiple Choiceendocytosisexocytosisactive transportfacilitated diffusionsimple diffusion

By which mechanism do compounds like oxygen, carbon dioxide, and fatty acids move through a cell membrane?Multiple choice question.diffusionhydrostatic pressureactive transportfiltration