Cell size, Plasma membrane

Question 1

Cellular metabolism depends on….

Answer 1

cell size

Question 2

The size of a cell dictates its…

Answer 2

Function, cells need a high surface area:volume ratio to optimize the exchange of material through the plasma membrane

Question 3

Plasma membrane

Answer 3

Separates internal cell environment from external environment, comprised primarily of phospholipids

Question 4

Phospholipids are….

Answer 4

Amphipathic since they have both hydrophillic and hydrophobic regions

Question 5

Selective permeability

Answer 5

The ability of membranes to regulate the substances that enter and exit

Question 6

Fluid mosaic model

Answer 6

A model to describe the structure of cell membranes

Question 7

Fluidity within the membrane

Answer 7

1. Membrane is held together by weak hydrophobic interactions and therefore can move and shift
2. Unsaturated hydrocarbon tails help maintain fluidity at low temps
3. Kinked tails prevent tight packing of phospholipids

Question 8

Cholesterol

Answer 8

Helps maintain fluidity at high and low temperatures

Question 9

Integral proteins

Answer 9

Proteins that embedded in the lipid bilayer

Question 10

Peripheral proteins

Answer 10

Proteins that are NOT embedded into the lipid bilayer and instead loosely bonded to the surface

Question 11

Membrane carbs

Answer 11

Important for cell to cell recognition

Question 12

Glycolipids

Answer 12

Carbs bonded to lipids

Question 13

Glycoproteins

Answer 13

Carbs bonded to proteins, most abundant

Question 14

Cell wall

Answer 14

Only found in plant cells, covers plasma membrane and provides shape, protection, and regulates water intake.

Question 15

Cell wall is composed of

Answer 15

Cellulose

Question 16

Cell wall contains a…

Answer 16

Plasmodesmata, which are hole like structures in the cell wall that are filled with cytosol and connect adjacent cells.