BioScience Dictionary

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Found Bacteriophage 37 times.

Displaying results 1 to 10.

1. 5-hydroxymethylcytosine
A nucleotide base derived from cytosine which is used by the bacteriophage T4 in place of cytosine in its DNA . The substitution protects the bacteriophage from its own nuclease enzyme s (enzymes which cut apart DNA).

2. Att site
A site on the chromosome of the bacteria E. coli where the lambda bacteriophage can insert its genome (all of its DNA ) so that it can lie dormant and have its DNA reproduced whenever the bacterium reproduces for as long as the bacterium remains healthy (that is, so that it becomes lysogen ic).

3. Bacterial virus (bacteriophage)
A virus which infects bacteria and is usually species -specific.

4. Bacteriophage lambda
A bacteriophage (a virus which infects bacteria ) that infects E. coli . It has a complex set of regulatory mechanisms to determine whether it will quietly insert its DNA into the bacterial genome to become dormant and to be reproduced whenever the bacterium reproduces (to lysogenize ), or whether it will hijack the bacterium's cellular machinery to reproduce itself and prepare to infect more bacteria, causing the bacterium to self-destruct shortly after infection (to lyse ). Lambda is particularly useful to geneticist s because parts of it can be used to introduce foreign DNA into the bacterial genome; it is a cloning vector .

5. Bacteriophage M13
A bacteriophage (a virus which infects bacteria ) that has single-stranded DNA . It is used as a method of obtaining single strands of foreign DNA so that the foreign DNA can be sequenced (that is, the order of its nucleotide base s can be determined). It is also used in procedures to create mutation s in vitro (in a test tube rather than within an organism).

6. Bacteriophage omicron X174
A bacteriophage (a virus that infects bacteria ) which has as its genetic material DNA in single strands instead of the usual double strands. The virus is useful to those who study how DNA replicate s.

7. Bacteriophage T4
A bacteriophage (a virus which infects bacteria ) which uses DNA as its genetic material (some viruses use RNA ) and is unusually large.

8. Bacteriophage T7
A bacteriophage (a virus which infects bacteria ) that is useful to geneticist s because it has a very strong promoter region which strongly encourages transcription of its gene by specific T7 RNA polymerase . Geneticists can take the part with the promoter and attach their own genes of interest to it so that they can control transcription rates of their gene by choosing the amount of the RNA polymerase to put in.

9. Bacteriophages
Viruses that attack and kill bacterial cells; composed only of DNA and protein.

10. Charon phage
A cloning vector made from the virus bacteriophage lambda that is used to clone DNA .