lecture 6 viruses and bacteriophage Flashcards
1
Q
extracellular viruses
A
inert virions
2
Q
genome size
A
5Kb -1.2 MBp
3
Q
size of T4
A
200 nm long
80-100 nm wide
4
Q
RNA virus
A
ssRNA= MS2 dsRNA= Phi 6
5
Q
ssDNA
A
phix174
fd, M13
6
Q
dsDNA
A
T3,T7
Mu
Lambda
T2, T4
7
Q
virulent virus
A
lost its ability to lysogenize into the host chromosome and will almost always cause lysis
8
Q
temperate virus
A
can causes lysis or lysogeny
9
Q
prophage
A
the genetic material of a bacteriophage, incorporated into the genome of a bacterium and able to produce phages if specifically activated.
10
Q
what causes the injected DNA to circularise?
A
cos sites in the bacteriophage lambda genome (cohesive ends)
11
Q
determinant of lysogeny
A
C1- lambda repressor gene
12
Q
determinant of lysis
A
cro
