what are mechanisms course hero

What determines the host range of a virus?

C) The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach. Attachment of the virus to the host cell (the first step in the viral life cycle) requires:

What happens when you add antibiotics to E. coli?

An antibiotic is added to a culture of E. coli, resulting in death of the cells. Bacteriophages are then added. Would the phages replicate in the E. coli cells?

What is the cause of cholerae?

Cholera is caused by the bacterium Vibrio cholerae. You make a list of questions about V. cholerae that you answer with the help of your nursing school study group.

Why is phage therapy important?

Using phages to treat a bacterial infection is an interesting idea because: - of the increasing problem of antibiotic resistance in pathogens. - lysed bacteria pose no threat to a person's health. - of the increasing problem of antibiotic resistance in people.

Why do animals lyse?

Cells infected with animal viruses lyse because: - the release of the virions depletes the cell of energy. - the virus releases enzymes that lyse the cell. - functions necessary for cell survival are not carried out and the cell dies.

What causes tumors in the body?

The majority of tumors are caused by oncogenic viruses but some may be caused by mutations in host genes that regulate cell growth. - pg 351 says "the majority of tumors are not caused by oncogenic viruses, however, but by mutations in host genes that regulate cell growth.". - single-stranded RNA.

What is a chiasma?

Chiasma. A connection formed between chromatids, visible during meiosis, thought to be the point of the interchange involved in crossing-over. Mendelian Principles of Inheritance (only described discrete traits) *describe traits controlled by one gene with 2+ alleles. *genes segregate and assort independently.

What is bivalent chromosome?

Bivalent. a pair of homologous chromosomes. Chiasma. A connection formed between chromatids, visible during meiosis, thought to be the point of the interchange involved in crossing-over. Mendelian Principles of Inheritance (only described discrete traits) *describe traits controlled by one gene with 2+ alleles.