Biological Membranes and Cell Division in Eukaryotic Cells Flashcards Preview

Biology > Biological Membranes and Cell Division in Eukaryotic Cells > Flashcards

Flashcards in Biological Membranes and Cell Division in Eukaryotic Cells Deck (84)
Loading flashcards...
1

the common feature found in all cells

the plasma membrane

2

what is the plasma membrane composed of

a phospholipid bilayer

3

is embedded with proteins and is referred to as the fluid mosaic model of cell membrane structure

phospholipid bilayer

4

the model of the membrane that shows the membrane is composed of proteins

fluid mosaic model

5

the spaces in between the proteins are filled with

phospholipids

6

The phospholipid consists of these and it points toward the outside environment of the cytoplasm

hydrophilic heads

7

repels the water and points in

hydrophobic tails

8

forms a bilayer that acts like a barrier between the cell and its environment

the phospholipids

9

regulates the entry and exit of specific molecules through the cells

the plasma membrane

10

why is the plasma membrane considered to be selectively-permeable

because it allows the passage of some substances but not others

11

what is the cytoplasm of cells made of

75 to 85 % water

12

most substances entering the cells are

dissolved in water

13

What is water considered

the solvent of life

14

solutes are

substances dissolved in water

15

solvents are

a solution consists of solutes dissolved

16

if the solvent is water, then what is the solution referred to as

an aqueous solution

17

the most common method by which solutes enter the cells by is called

diffusion

18

define diffusion

diffusion is the movement of substances from a region of high concentration to a region of low concentration.

19

the movement of substances from a region of high concentration to a region of low concentration is known as

diffusion

20

once inside the cell, solutes move by

diffusion through the cytoplasm

21

why doesn't diffusion require the input of energy

because molecules naturally tend to move in this fashion

22

does not require the input of energy because molecules naturally tend to move in this fashion

diffusion

23

besides diffusion what is another type of movement that occurs across the plasma membrane

osmosis

24

define osmosis

the movement of water across a membrane and it occurs from a region of high water concentration to a region of low water concentration

25

the movement of water across a membrane and it occurs from a region of high water concentration to a region of low water concentration.

osmosis

26

both occur until the cell has reached equilibrium

diffusion and osmosis

27

both occurs until the cell has reached a point at which the substance or water is uniformly distributed throughout the cell

both diffusion and osmosis

28

the point at which the substance or water is uniformly distributed throughout the cell

equilibrium

29

________ is the movement of molecules from high concentration to low concentration. The rate at which _______ occurs is ___________

Diffusion, diffusion occurs is influenced by many factors such as weight. The larger a molecule the slower the rate of diffusion

30

The movement of water across the plasma membrane is called

osmosis