Keystone Review-Ch7Sec2

Keystone Review-Ch7Sec2

Multiple Choice

Which component of a cell membrane contains a hydrophobic region and acts as the primary barrier to most foreign substances?

• protein

• cholesterol

• carbohydrate chain

• phospholipid bilayer

Multiple Choice

Which of the following is most involved in providing structure for a plasma membrane?

• the number of protein channels embedded in the membrane

• the types of carbohydrates attached to proteins on the surface

• the types of proteins that are attached to the surface of the membrane

• the arrangement of the hydrophobic and hydrophilic ends of the phospholipids

Multiple Choice

The integral protein is part of a cell membrane. What is the most likely purpose of this protein?

• It allows passage of particles into and out of the cell.

• It manufactures phospholipids to repair membrane damage.

• It releases stored chemical energy in membrane carbohydrates.

• It attracts unbalanced electrical charges in the cell’s environment.

Multiple Choice

A researcher noticed that a similar CH2 molecular structure was also located in the plasma membrane of an animal cell. This CH2 molecular structure contained a negatively charged phosphate group. Which statement best describes the primary function of the CH2 and phosphate molecular structure located in the plasma membrane?

• It contains the genetic information needed for protein production.

• It catalyzes specific chemical reactions in the cytoplasm of a cell.

• It stores the energy that a cell needs to perform various life processes.

• It allows a cell to regulate the movement of materials into and out of a cell.

Multiple Choice

Carbon dioxide and oxygen are molecules that can move freely across a plasma membrane. What determines the direction that carbon dioxide and oxygen molecules move?

• orientation of cholesterol in the plasma membrane

• concentration gradient across the plasma membrane

• configuration of phospholipids in the plasma membrane

• location of receptors on the surface of the plasma membrane