Question 26 Which statement about the plasma membrane is true?
O Proteins embedded in the cell wall act as channels.
O Phospholipids in the plasma membrane serve as markers.
O Cholesterol helps keep the plasma membrane hydrophobic.
O The plasma membrane forms an impenetrable barrier.

Which of the following statements accurately defines epidermis? a. a thick protein fiber composed of the protein collagen b. hard, dense bone tissue found on the outer surface of a bone c. single layer of epithelial cells and the underlying basal lamina d. outer, protective layer of the skin composed of stratified squamous keratinized epithelial tissue