Cell Membrane Structure and Transport

Which biomolecules (THREE) are found in the cell membrane?

• lipids

• proteins

• nucleic acids

• carbohydrates

Which biomolecule makes up MOST of the cell membrane?

• proteins

• carbohydrates

• phospholipids

• nucleic acids

Which biomolecule helps LARGE molecules cross the membrane?

• phospholipids

• carbohydrates

• nucleic acids

• proteins

Which TWO parts of the membrane allow molecules to pass through?

The cell membrane can separate the inside of the cell from the outside because of its phospholipids, which are

• hydrophilic on both sides
• hydrophobic on both sides
• hydrophilic on one side and hydrophobic on the other

Match the following functions to each biomolecule in the cell membrane:

• phospholipids

• allow small molecules to pass through the membrane

• proteins

• cell recognition

• carbohydrates

• transport LARGE/charged molecules through the membrane

How does the cell membrane help maintain homeostasis in each cell?

• The cell membrane allows all substances to pass through freely

• The cell membrane controls the movement of substances in and out of the cell

• The cell membrane provides energy for the cell

• The cell membrane produces proteins necessary for cell function

Tags

NGSS.HS-LS1-3

Passive transport ​ (a)   require energy because it moves ​ (b)   the concentration gradient, from ​ (c)   .

• does NOT
• does
• with
• against
• high to low
• low to high

Active transport ​ (a)   require energy because it moves ​ (b)   the concentration gradient, from ​ (c)   .

• does NOT
• does
• with
• against
• high to low
• low to high

What is the correct description of the transport in the image?

• small molecules crossing the lipid bilayer (diffusion)

• large molecules crossing through a protein (facilitated diffusion)

• many molecules coming into the cell using a membrane vesicle (endocytosis)

• many molecules coming out of the cell using a vesicle to fuse with the membrane (exocytosis)