Quick 10Q: Plasma Membrane

Which of the following describes the main components of the plasma membrane?

• steroids and proteins

• proteins and phospholipids

• phospholipids and carbohydrates

• carbohydrates and steroids

Which of the following describes the orientation of the plasma membrane?

• hydrophobic heads face the exterior and interior of the cell while hydrophilic tails make up the interior of the membrane

• hydrophilic heads face the exterior and interior of the cell while hydrophobic tails make up the interior of the membrane

• hydrophobic heads face the exterior of the cell and hydrophilic tails face the interior of the cell

• hydrophilic heads face the exterior of the cell and hydrophobic tails face the interior of the cell

What types of materials are easily able to diffuse across the plasma membrane?

• small and polar

• large and polar

• small and nonpolar

• large and nonpolar

Which of the following maintains the fluidity of the plasma membrane?

• cholesterol

• carrier protein

• fatty acid tails

• glycolipids

Which of the following describes the plasma membrane of organisms in cooler environments?

• Phospholipids with more than one phosphate group

• Phospholipids with more unsaturated fatty acid chains

• Phospholipids with more saturated fatty acid chains

• Phospholipids with more membrane surface area

Tags

NGSS.HS-LS4-4

If a protein is on the cytoplasmic side of a vesicle, which of the following describes the location of the protein after exocytosis?

• Released from the plasma membrane into the extracellular fluid

• Bound to the extracellular side of the plasma membrane

• Incorporated in the intracellular side of the plasma membrane

• Attached to the endoplasmic reticulum on the cytosolic side

Which of the following describes the function of the glycolipids found on the plasma membrane?

• cell-cell communication

• enzymatic activites

• intracellular junction

• receptor for extracellular ligands

Which of the following describes the difference between a transmembrane protein and a peripheral protein?

• Transmembrane proteins are solely responsible for receptor while peripheral proteins are solely responsible for transport

• Peripheral proteins are solely responsible for receptor while transmembrane proteins are solely responsible for transport

• Peripheral protein are amphipathic while transmembrane proteins are hydrophilic.

• Transmembrane protein are amphipathic while peripheral proteins are hydrophilic.

In the Frye & Edison experiment, they labeled plasma membrane proteins of mouse and human cells with different markers. The researchers observed the markers on the hybrid cell. Which of the following describes the hybrid plasma membrane assuming that the mouse cell was initially on the left side?

• All of the mouse proteins are on the left while the human proteins are on the right.

• All of the human proteins are on the left while the mouse proteins are on the right.

• The two cells do not bind together and there will be no hybrid cell.

• All of the mouse and human proteins will be randomly dispersed

Which of the following describes why the plasma membrane is selectively permeable?

• The proteins that make up the plasma membrane only bind with specific materials to allow passage into the cell.

• The proteins that make up the plasma membrane degrade materials to inhibit passage into the cell.

• The phospholipid bilayer is nonpolar which inhibits charged and polar substances from passing.

• The phospholipid bilayer is polar which inhibits nonpolar substances from passing.