Mid Semester Exam Study Flashcards
0
Q
Escherichia?
A
A prokaryote (cell that lacks a membrane bound nucleus)
1
Q
Amoeba?
A
A eukaryote ( a cell that contains a nucleus)
2
Q
Vision?
A
Mature virus comprising all parts
3
Q
Viroid?
A
Infectious circular RNA plant pathogen
4
Q
Prion?
A
Infectious protein
5
Q
Viral nucleic acid
A
- does not contain genes needed for synthesis of new virus
- does not contain genes needed for energy generation
- only RNA or DNA not both (single stranded or double stranded)
6
Q
Viral capsid
A
- protein coat covering virus
- symmetrical
- antigenic properties
- protects nucleic acid from enzymes
- assists in attachment and entry
7
Q
Viral envelope
A
-lipid bilayer made from membrane of host cell
8
Q
A virus lacking an envelope is considered to be?
A
A naked virus
9
Q
Naked viruses are considered more resistant to the environment because?
A
- the envelope is damaged easily
10
Q
Inactivation of a virus outside of a host cell
A
- heat of 60 degrees for 30 minutes
- envelope can be destroyed by detergent
- chemically harder to kill than bacteria
- some can last days at 4 degrees
- some are stable in salt solution
- generally stable at pH 5-9
11
Q
Virus classification
A
- classified by:
- nucleic acid
- DNA virus
- RNA virus
12
Q
A virus genome is either?
A
- DNA or RNA
13
Q
What is a genome?
A
- a virus genome is RNA or DNA never both
- it is encoded in its nucleic acid
- may be single stranded, double stranded, circular or linear, positive sense (mRNA) or negative sense
14
Q
Structure of a virus
A
- nucleic acid genome
- enclosed in protein coat or capsid
- can be further enclosed in envelope
- non- living
- smallest infectious agent
15
Q
3 types of cell cultures for growing a virus?
A
- primary cell culture
- secondary cell culture
- immortal cell culture