Prokaryotic cells and viruses

Question 1

How small is a prokaryotic cell?

Answer 1

1um - 10um

Question 2

What is the structure and role of the cell wall in a prokaryote?

Answer 2

• Made of murein
• a physical barrier that excludes certain substances and protects against mechanical damage.

Question 3

What is the role of the mucilaginous slime capsule?

Answer 3

Helps prokaryotes cling to each other and prevents drying out.

Question 4

What is the role of cell surface membrane?

Answer 4

Acts as a differentially permeable layer which controls the entry and exit of chemicals.

Question 5

What does the cell-surface membrane contain?

Answer 5

70S ribosomes.

Question 6

What is the role of circular DNA?

Answer 6

contains the genetic information for the replication of bacterial cells.

Question 7

What is the role of the plasmids?

Answer 7

Possess genes that may aid the survival of bacteria in adverse conditions

Question 8

Compare eukaryotic and prokaryotic cells?

Answer 8

DNA: P- freely in the cytoplasm, continue extra dna plasmids and not bound to proteins. E- in the nucleus and bound to histone proteins, no plasmids.

Cell wall: p- made of murein. e- cellulose or chitin.

Organelles: p-no membrane bound organelles. e- some membrane bound cells eg mitochondria.

Ribosomes: p- 70s. e- 80s

Question 9

What is a virus?

Answer 9

An Acellular, non living particle.

Question 10

What are the components of viruses?

Answer 10

Proteins molecules, capsid, RNA genetic material, matrix.