Question

question 2
in a lipid bilayer, ________ fatty acid tails face each other within the bilayer and form a region that excludes water.
hypotonic
hydrophilic
hydrophobic
hyperosmotic
question 3
which statement about lipid bilayers is incorrect?
they spontaneously form closed vesicles (rings)
they can fuse with other bilayers
they are self - sealing
they are inflexible
question 4
which cellular mechanism ejects products, such as hormones, by the fusion of a vesicle with the plasma membrane?
receptor - mediated endocytosis
exocytosis
phagocytosis
endocytosis

Explanation:

• For Question 2: Lipid - bilayer fatty acid tails are non - polar and avoid water, which is the characteristic of hydrophobic substances.
• For Question 3: Lipid bilayers are flexible due to the nature of the fatty - acid chains and the fluid - mosaic model. The statement that they are inflexible is incorrect.
• For Question 4: Exocytosis is the process by which a cell releases products like hormones by fusing a vesicle with the plasma membrane.

Answer:

Question 2: C. Hydrophobic
Question 3: D. They are inflexible
Question 4: B. Exocytosis