Jeopardy Cell Membrane Chapter 5 Jordyn Gardner modified by christine biel

Membrane structure and function Exocytosis and endocytosis Membrane Proteins Diffusion Osmosis Exocytosis and endocytosis 100 200 300 400 500

What is the structure of cell membranes? Lipid bilayer

By this model, a cell membrane has a mixed composition of phospholipids, glycolipids, sterols, and proteins. What is it? Fluid Mosaic Model

proteins and phospholipids A cell membrane includes 2 layers composed mainly of ________& _________. proteins and phospholipids

True or False: Many different proteins having different functions are embedded in the membrane or positioned at its surfaces? True

What makes up a phospholipid ? A phosphate-containing head and two fatty acid tails.

What does the cell membrane do? -Serves as a boundary between the outside environment and the inside of the cell -gives form and shape to cells Can connect on cell to two or more adjacent cells -helps vesicles form (other answers may be acceptable)

What helps cells of the same type locate, stick together, and remain in the same proper tissues? Adhesion proteins

These form channels that match up across the plasma membranes of two animal cells; they let signals and substances flow rapidly between their cytoplasm Gap junctions

These bind extracellular substances, such a s hormones, that trigger changes in cell activities Receptor Proteins

Glycoproteins or glycolipids Like molecular fingerprints, they identify each cell as belonging to a "self"- in other words, which molecules are involved in cell to cell recognition? Glycoproteins or glycolipids

Transport Proteins, protein channels These passively let solutes cross the membrane through their interior or they actively pump them through. Transport Proteins, protein channels

The name for the net movement of like molecules or ions down a concentration gradient. Diffusion

What does it mean when its molecular structure lets some substances but no others cross it in certain ways, at certain times? It has selective permeability, is semi- permeable or is differentially permeable.

Does diffusion go up or down a concentration gradient?

What is a concentration gradient? A separation of different concentration solutions by a semipermeable membrane

Name one factor that influences the rates of movement down a concentration gradient? The gradient’s steepness, molecular size, temperature, and electric or pressure gradients that may be present.

When water molecules diffuse down the concentration gradient and cross that membrane we call this? Osmosis

Which tonicity is the one with fewer/less solutes? hypotonic

What tonicity has more solutes? hypertonic

This solution has the same amount of solutes. Isotonic

Osmotic pressure/ Turgor pressure The amount of force preventing further increase in a plant cell's volume? Osmotic pressure/ Turgor pressure

What is it called when a vesicle moves from the golgi apparatus to the cell surface and fuses with the plasma membrane? Exocytosis

When a cell takes in substances near its surface it is? endocytosis

Lay people would call phagocytosis what? Cell eating

Do Exocytosis, and endocytosis continually replace and withdraw patches of its plasma membrane? yes

Overall what does Exocytosis and endocytosis do? Move large packets (vesicles) of materials across a plasma membrane.