cells & organelles

Question 1

What is prokaryotic cells and eukaryotic cells?

Answer 1

Prokaryotic cells are single-celled organisms with no membrane-bound organelles. Eukaryotic cells are cells with membrane-bound organelles including a membrane-bound nucleus.

Question 2

What is ultrastructure?

Answer 2

The things you can see under an elctron microscope.

Question 3

What are 3 things that eukaryotic cells have but prokaryotic cells do not?

Answer 3

Eukaryotic cells have:

1. distinct nucleus
2. membrane-bound organelles
3. lysosomes

Question 4

What is the function of the following:

nucelus

nucelar envelope

nuclear pores

chromatin

nucleolus

Answer 4

nucleus- contains genetical material and controls the cells activity.

nuclear envelope - (double membrane) controls the entry and exit of maerials from the nucleolus.

nuclear pores- allows large molecules such as mRNA to exit the nucleolus.

chromatin - made up of proteins and DNA. Also controls the cell’s activity.

nucleolus - synthesises ribosomes.

Question 5

What are 3 functions of the nucleus?

Answer 5

1. produces mRNA for protein synthesis
2. manufactures ribosomes
3. retains genetic material in the form of DNA or chromosomes.