Organelles

Question 1

What are the four non membrane bound organelles

Answer 1

1. Ribosomes
2. Centrioles
3. Cilia and flagella
4. Cytoskeleton

Question 2

What is an organelle

Answer 2

An organelle is a sub cellular structure that has one or more specific jobs to perform in the cell

Question 3

1.What’s a membrane bound organelle 2.what does the membrane do

Answer 3

1. A membrane bound organelle is a cellular structure that’s surrounded by a phospholipid bilayer
2. This membrane separates the organelle from the cytoplasm and allows the organelle to control what enters and leaves the cell

Question 4

What is the nuclear envelope and what is its function

Answer 4

The nuclear envelope is the double membrane that surrounds the nucleus and separates the content of the nucleus from the cytoplasm

Question 5

1.Why is there tiny pores on the nuclear envelope
2. What is the pore complex structure and function

Answer 5

1.The nuclear envelope is covered in tiny pores where certain substance can enter and exit
2.The pore complex is a protein structure that regulates what flows in and out

Question 6

Where is chromatin most densely packed in the nucleus

Answer 6

Nucleolus

Question 7

What is chromatin

Answer 7

chromatin is the mixture of DNA and proteins that form the chromosomes found in the cells

Question 8

What are ribosomes made up of

Answer 8

Proteins and rRNA (ribosomal RNA)

Question 9

Where are ribosomes present in the cell and what do they do

Answer 9

free ribosomes are free in the cytoplasm and generally make proteins used within the cytoplasm
bound ribosomes are bound on the rough ER(endoplasmic reticulum) and make proteins for the cell membranes or to be exported elsewhere

Question 10

Where are ribosomes present in the cell

Answer 10

free ribosomes are free in the cytoplasm and generally make proteins used within the cytoplasm
bound ribosomes are bound on the rough ER(endoplasmic reticulum) and make proteins for the cell membranes or to be exported elsewhere

Question 11

What are the folds in the Golgi body called and what does each end do

Answer 11

Golgi body Consists of folds called cisternae as
The cis end receives molecules
the trans end ships molecules out

Question 12

What is the space between chloroplasts and mitochondria’s double membrane

Answer 12

Intermembranous space

Question 13

What are the folds in mitochondria’s second membrane called

Answer 13

Cristae

Question 14

What is the function of lysome

Answer 14

Contain digestive enzymes which break down molecules e.g non functional organelles

Question 15

What is the function of the nucleus

Answer 15

1. DNA replication and transcription
2. Contains genetic code
3. Site of ribosomes synthesis

Question 16

What does the nucleolus do

Answer 16

Site of rRNA production and makes ribosomes

Question 17

Flagella function

Answer 17

Chemical stimuli and mobility

Question 18

1. The two type of cilia are?
2. Their functions?

Answer 18

1. Mobile or stationary
2. mobile cilia Help move substances in a sweeping motion. stationary cilia important for sensory organs e.g the nose

Question 19

1. what is the cytoskeleton and where is it
   2.what is the cytoskeleton made up of

Answer 19

1.A network of fibres found within the cytoplasm all over a cell
2.consists of microfilaments, microtubeles and intermediate fibres