Chemical barriers composed of phospholipid bilayers form within biological systems because

A. the inability of the polar heads to dissolve in water causes the heads to adhere to one another.
B. hydrophobic exclusion results in the close positioning of the nonpolar tails.
C. van der Waals forces attract the polar heads to the water inside the cell.
D. cells expend ATP to position the phospholipid tails close together.


Answer: B

Anatomy & Physiology

You might also like to view...

Which of the following muscles is classified as pennate?

A. Sartorius B. Biceps brachii C. Orbicularis oculi D. Pectoralis major E. Semimembranosus

Anatomy & Physiology

Na+ and Cl- are examples of __________________

Fill in the blank(s) with correct word

Anatomy & Physiology

The renal pelvis eventually narrows to form the ____

a. ureter b. urethra c. renal pyramid d. minor calyx

Anatomy & Physiology

The muscle end that is attached to the moving bone is the ________.

A. point of movement B. point of insertion C. point of control D. point of origin

Anatomy & Physiology