MCA High School Biology Practice Questions - Minnesota Comprehensive Assessment (MCA-IV) Science - High School Life Science Biology Exam

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The plasma membrane regulates the movement of substances into and out of the cell. Which molecular arrangement forms the basic structural foundation of the plasma membrane?

A double layer of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward A single layer of protein molecules anchored to cellulose fibers A network of nucleic acids interwoven with carbohydrate chains A solid sheet of cholesterol molecules bound to peripheral enzymes

Correct Answer:

A double layer of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward

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