Viruses

Question 1

Viruses

Answer 1

•Are non cellular structures
•No cell organelles - difficult to classify into a kingdom
•Are obligate parasites- can only replicate in a host

Question 2

Capsid

Answer 2

A protein coat for protection

Question 3

Nucleic acid

Answer 3

Inside virus structure
Either dna or rna

Question 4

Living

Answer 4

Contain genetic material
Have a protein coat
Can replicate inside a living vell

Question 5

Non living

Answer 5

Only contain one type of nucleic acid
Have no cell organelles
Cannot reproduce on there own

Question 6

Virus replication
1.

Answer 6

Attachment
Virus’s attach to a host cell (bacteria)

Question 7

Virus replication
2.

Answer 7

Entry
•Virus form a hole in the host cell and injects viral nucleic acid
•The protein coats of •bacteriophages stay outside the bacteriam cell
•When viruses enter animal cells the protein coats also enter but are digested

Question 8

Virus replication
3.

Answer 8

Synthesis
Virus makes a host cell produce more viral nucleic acid and proteins
Host dna is made inactive

Question 9

Virus replication
4.

Answer 9

Assembly
New virus’s are made inside the host cell

Question 10

Virus replication 5.

Answer 10

Release
New viruses burst out of the host cell and infect further cells
The bustling of the host cell is called lysis

Question 11

Shape of viruses

Answer 11

Classified according to there shape
Round
Rod
Complex

Question 12

Bacteriophage

Answer 12

Virus that infects bacteria
Complex shape

Question 13

Disadvantages of viruses

Answer 13

Human diseases - common cold flu
Plant diseases- mosaic virus
Animal diseases - foot and mouth rabies

Question 14

Adv of viruses

Answer 14

Genetic engineering
Bacteriophage used to treat and control bacterial infections

Question 15

Antibiotics and viruses

Answer 15

Antibiotics kill bacteria but do not effect viruses