34. Viruses Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Virus shapes

A

Rod
Round
Complex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Virus structure

A
  1. Surrounded by a protein coat (chemical component)
  2. Inside is nucleic acid, either DNA or RNA
  3. No organelles-so no metabolic reactions, so require host cells to carry out these reactions
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why are viruses not seen as living or non living

A
  1. Have either DNA or RNA-living have both, non living have neither
  2. Have no organelles- living things have organelles
  3. Cant reproduce by themselves-need a host-obligate parasite
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Disadvantages of viruses

Economic importance

A
  1. Causes contagious human diseases: Measles, mumps, rubella, colds
  2. Causes plant diseases, causes spots on plants- potato and tomato mosaic diseases
  3. Causes animal diseases-foot and mouth, rabies
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Advantages of viruses

Economic importance

A
  1. Control bacterial infections

2. Mosaic patterns give new variety to garden plants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How to control viral infections

A
  1. Antibiotics have no effect on them.
  2. Controlled by body’s own defence system-production of antibodies
  3. Vaccine
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do viruses reproduce

A

They can only reproduce using a host cell-obligate parasites

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Obligate parasite def.

A

An organism which can only reproduce using a host cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Process of viral reproduction

step 1

A
  1. Attachment and entry:

virus attaches to host cell and inserts its nucleic acid into the hosts cytoplasm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Process of viral reproduction

Step 2

A

Synthesis and Assembly:
Viral nucleic acid breaks down the hosts DNA and forces the host to make viral DNA (Synthesis) and new copies of the virus (Assembly)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Process of viral reproduction

Step 3

A

Release:

The new virus bursts out of the host cell to infect further cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a bacteriophage

A

Virus that infects a bacteria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a bacterium

A

Bacteria that is infected

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the biochemical component of the Virus

A

DNA or RNA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the chemical component of the virus

A

Protein coat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly