Topic 2 Cells: Membrane Proteins

Question 1

1. Peripheral
2. Integral
3. Transmembrane
4. Channel Proteins
5. Recognition Proteins
6. Ion Channels
7. Porins
8. Carrier Proteins
9. Transport Proteins
10. Adhesion Proteins
11. Receptor Proteins

Answer 1

Types of Proteins

Question 2

• Loosely attached to the surface of one side of the membrane

Answer 2

Peripheral

Question 3

• Embedded in the cell membrane

Answer 3

Integral

Question 4

• Type of integral membrane that travels all the way through the cell membrane

Answer 4

Transmembrane

Question 5

• Provide a passageway through the membrane for hydrophilic (water-soluble), polar, and charged substances

Answer 5

Channel Proteins

Question 6

• Type of glycoprotein (have an attached oligosaccharide) that is used to distinguish between self and foreign

Answer 6

Recognition Proteins

Question 7

• Used to pass ions across the membrane and referred to as gated channels in nerve and muscle cells
• Can be voltage-gated (respond to difference in membrane potential), ligand-gated (chemical binds to open channel), or mechanically gated (respond to pressure or vibration)

Answer 7

Ion Channels

Question 8

• Allow the passage of certain ions and small polar molecules
• Increase the rate of water passing in kidney and plant root cells
• Tend to be less specific

Answer 8

Porins

Question 9

• Specific to movement across the membrane via integral membrane protein
• Changes shape after binding to molecules that enables it to be passed across

Answer 9

Carrier Proteins

Question 10

• Use ATP to transport materials across the membrane
• Includes active transport and facilitated diffusion
• Active transport requires ATP while facilitated diffusion does not

Answer 10

Transport Proteins

Question 11

• Attach cells to neighboring cells and provide anchors for stability via internal filaments and tubules

Answer 11

Adhesion Proteins

Question 12

• Serve as binding sites for hormones and other trigger molecules

Answer 12

Receptor Proteins