Plasma Membrane

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

Which statement best describes how channel and carrier proteins in the plasma membrane are similar?

• Both allow for the flow of molecules into and out of a cell

• Both directly connect the membrane to the nucleus of a cell

• Both use energy to continuously move water molecules out of a cell

• Both cause the phospholipid bilayer to form a rigid membrane for a cell

Which statement best describes a function of the proteins embedded in the plasma membrane of cells?

• They provide instructions for the processes in the cell.

• They selectively allow certain particles into and out of the cell.

• They attract charges in the cell’s environment to give the cell a net charge.

• They store the energy required by the rest of the membrane to perform its functions.

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

Which action is prevented by the plasma membrane?

• the flow of light into or out of the cell

• the flow of oxygen into or out of the cell

• unlimited flow of heat into or out of the cell

• unlimited flow of water into or out of the cell

Tags

NGSS.HS-LS1-3

Use the diagram to answer the question. The indicated 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.

Use the list to answer the questions. The functions of which cell structure are described in this list?

• lysosome

• mitochondria

• plasma membrane

• endoplasmic reticulum

Tags

NGSS.HS-LS1-7

Use the diagram to answer the question. Which component of this membrane contains a hydrophobic region and acts as the primary barrier to most foreign substances?

• protein

• cholesterol

• carbohydrate chain

• phospholipid bilayer

Which of the following is a function of the cell membrane of a cell?

• The transport of molecules into and out of the cell through osmosis and diffusion.

• The production of energy from food molecules using cellular respiration.

• The production of genetic material through DNA transcription.

• The transport of genetic material within the cytoplasm of the cell.

The cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell. In fact, polar molecules are unable to go across unless ___

• they pass through channels in the cell membrane

• they react with other substances to become nonpolar

• they are broken down into smaller pieces

• they are enclosed in water-filled vesicles