Which of the following is the best explanation for why cholesterol decreases the permeability of biological membranes?
A) Cholesterol binds to the outside surface of a membrane, thus blocking the movement of solutes.
B) Because cholesterol is amphipathic, it forms tiny vesicles that trap solutes.
C) Because cholesterol is amphipathic, it fits in between the phospholipids and blocks diffusion through the membrane.
D) Cholesterol has four rings in its structure that can sequester (trap) solutes.
Answer: C
You might also like to view...
An open space within the gastrula is the _____
A) ectoderm B) mesoderm C) archenteron D) endoderm E) neural crest cells
The signaling molecule involved in juxtacrine cell signaling is:
A. a small soluble peptide. B. a neurotransmitter. C. a transmembrane protein. D. a growth factor.
Answer the following statements true (T) or false (F)
1. Glycolysis involves 10 enzyme-catalyzed steps, that can be grouped into three phases: energy investment phase, cleavage phase, and the energy liberation phase. 2. The electron transport chain consists of a series of redox reactions in which electrons are transferred to oxygen as the final electron acceptor. 3. Oxygen is an excellent final electron acceptor because of its low electronegativity. 4. NADH and FADH2 donate their electrons to protein complex I. 5. Ubiquinone is also known as coenzyme Q.
A type of fungi that has been long useful for baking, brewing, and wine making, and is now becoming very important in genetic research is ________.
Fill in the blank(s) with the appropriate word(s).