transport across cell membranes

Question 1

what is the cell membrane composed of

Answer 1

the cell membrane is composed of lipid and protein

Question 2

is the cell membrane permeable or selectivley permeable

Answer 2

selectivley permeable

Question 3

what is a concentration gradient?

Answer 3

a difference in concentration of a substance is a concentration gradient

Question 4

what is passive transport

Answer 4

passive transport describes the movement of its molecules down the concentration gradient from a high concentration to a lower concentration.

Question 5

what are 2 examples of passive transport

Answer 5

Diffusion and Osmosis are examples of passive transport process

Question 6

what is diffusion

Answer 6

Diffusion is the movement of a substance from a high concentration to a lower concentration down a concentration gradient

Question 7

give examples of substances that enter most cells by diffusion

Answer 7

examples of substances that enter most cells by by diffusion are oxygen glucose and amino acids

Question 8

give examples of substances that leave most cells by diffusion

Answer 8

examples of substances that leave most cells by diffusion are carbon dioxide and urea

Question 9

why is diffusion important

Answer 9

Diffusion is important to cells because it helps provide the cell with raw materials and helps to remove waste products

Question 10

what is osmosis

Answer 10

osmosis is the movement of water from a region of high water concentration to a region of lower water concentration through a selectivley permeable membrane

Question 11

what would happen to an animal cell if it was placed in a higher water soloution

Answer 11

An animal cell placed in a solution with a water concentration higher than that inside the cell will take up water by osmosis and could burst

Question 12

what would happen to an animal cell if it was placed in a solution with a lower water concentration

Answer 12

an animal cell placed in a solution with a lower water concentration than that inside the cell will lose water by osmosis and could shrink

Question 13

what would happen to a plant cell if it was placed in a solution with a higher water concentration

Answer 13

A plant cell placed in a solution with a higher water concentration than that inside the cell will take up water by osmosis and become turgid

Question 14

what would happen to a plant cell if it was placed in a solution with a lower water concentration

Answer 14

if a plant cell was was placed in a solution with a lower water concentration than that inside the cell will lose water by osmosis and become plasmolysed.

Question 15

what does plasmolysed mean

Answer 15

Plasmolysed is the term used to describe a cell in which the vacuole has shrunk due to water loss, causing the cell membrane to pull away from the cell wall

Question 16

what does turgid mean

Answer 16

Turgid is the term used to describe a cell or tissue in which the vacuole has swollen due to water gain and presses the cytoplasm and cell membrane against the cell wall

Question 17

what does active transport mean

Answer 17

Active transport is the movement of molecules from a region of low concentration to a region of higher concentration against the concentration gradient

Question 18

what does active transport require

Answer 18

active transport requires additional energy (ATP) to allow membrane proteins to move molecules against the concentration gradient

Question 19

cell membrane structure

Answer 19

Membranes are extremely thin and are composed of protein and lipid molecules in a layered arrangement containing pores

Question 20

GORE

Answer 20

Glucose and Oxygen enter cells by diffusion where they are involved in Respiration to release Energy

Question 21

lipid definition

Answer 21

fat or oil with molecules composed of fatty acids and glycerol

Question 22

CORE

Answer 22

to take up substances against a Concentration gradient cells use Oxygen for Respiration to release Energy for the process of active transport.

Question 23

what does and dosent require energy

Answer 23

osmosis/diffusion donot require extra energy

active transport does require active transport

Question 24

lysis definition

Answer 24

burst, no cell wall

Question 25

crenated definition

Answer 25

shrivelled up

Question 26

enzymes

Answer 26

biological catalyst

Question 27

hormone receptors

Answer 27

to receive and respond to specific hormone messages

Question 28

channel forming proteins

Answer 28

structural parts of a membrane that allow molecules to move across membranes

Question 29

carrier proteins

Answer 29

structural parts of a membrane that are involved in the active transport of molecules across membranes

Question 30

substances that can enter or leave cells by diffusion

Answer 30

oxygen, co2, glucose