CELL STRUCTURE

Question 1

All cells are surrounded by a selective barrier called what

Answer 1

plasma membrane also known as a cell membrane

Question 2

what do we find inside the cell barrier

Answer 2

a jellylike semi fluid called cytosol (cytoplasm) in which cell organelles are suspended

Question 3

name some cell organelles

Answer 3

nucleus 
mitochondria 
ribosomes 
Golgi apparatus 
vacuole 
they serve diff functions

Question 4

what are organelles

Answer 4

they are specialised structures found inside living cells that perform specific functions for the cell

Question 5

what is a cell membrane

Answer 5

it encloses the cell.
and it forms the outer boundary of the cell
surrounds the contents of the cell

Question 6

what is a cell wall

Answer 6

extracellular structure of plant which distinguishes the from animal cells

it s a wall that surround the cell on the outside

Question 7

why do plant cells have a cell wall but animals don’t

Answer 7

the cell will protects and support the cell

animals do not need a cell wall because organisms are protected and supported ut their skeleton

Question 8

what is a cytoplasm

Answer 8

it is a jelly like substance that fills the cell

it consist of water with other components which either dissolve or suspend in it

Question 9

what is a nucleus

Answer 9

it is a round organelle that is surrounded by a nuclear membrane and it contains the DNA of the cell

Question 10

what is a mitocondria

Answer 10

it is the organelle in the cell where cellular respiration takes place

Question 11

what is respiration

Answer 11

the process in which glucose breaks down in the presence of oxygen in the cells of organisms , to produce carbon dioxide , water and energy

Question 12

what is a chloroplast

Answer 12

found in plant cells

site for photosynthesis
contains the green pigment called chlorophyll
absorbs the light energy from the sun and converts it into energy rich sugars called glucose

sugars produced store as starch

Question 13

what is photosynthesis

Answer 13

process in which plants use chlrorphyll to convert radiant energy into sugars when carbon dioxide reacts with water also producing oxygen in the process

Question 14

wat is a vacuole

Answer 14

fluid filled sacs that are surrounded by the membrane

Question 15

how many vacuoles do animals and plants have

Answer 15

animals - one or two small vacuoles or no vacuoles at all

plants - have one or two large vacuoles which store substances like sugars ,salt ,water

Question 16

what are the differences between a plant cells and animal cell

Answer 16

1. plants cells have cell walls and animals cells don’t
2. plants have a regular shape due to rigid cell wall – animals cells have an irregular shape
3. plants cells have a large vacuole – animals cells have a small vacuole or non at all
4. plants cells have chloroplast which enables them to make her own food –animals cells don’t have chloroplast and therefore are unable to make their own food

Question 17

what the similarieties between a plant cells and a animal cell

Answer 17

dddd

Question 18

what is the function of a cell membrane

Answer 18

to control the movement of materials into and out of the cell

it is selectively permeable - it does not allow certain substances to enter the cell

Question 19

what is the function of a cell wall

Answer 19

to protect the plant cell,
to give it or maintain the shape of the cell
to prevents excessive uptake of water

Question 20

what is a cell wall made up of

Answer 20

made up of cellulose which is a tough substances which helps it stand upright

Question 21

what is the function of a cytoplasm

Answer 21

to provide a liquid medium for chemical reactions to take place

Question 22

what is the function of the nucleus

Answer 22

it houses chromosomes which are made of chromatin (DNA and proteins )

IT contains deoxyribonucleic acid (DNA) of organism
DNA contains the info that’d determines the organisms inherited characteristic

nucleus controls all cell activities

Question 23

what is the function of the mitochondria

Answer 23

it is the site for respiration

energy is released from glucose in the process of respiration

this energy produced from respiration is need by the cell to carry out it specific function

Question 24

what is the function of the vacuole

Answer 24

used to store substances that can be used by cell

aslo functions in waste disposal ad water balance