Hi Guys could you please help me to find the most correct answer. Thanks

1.What is a dominant activator?

one copy of an oncogene has been mutated and causes uncontrolled cell growth
a proto-oncogene that has stimulated caspases
viral reverse transcriptase
when a gene is mutated to stimulate cell division in the homozygous recessive form
a cellular homologue of a viral oncogene

2.How do tumor retrovirus promote cancer?

they cause the cells to detach from the basement membrane and metastasize
they carry an oncogene that promotes cancer
they cause cells to stop dividing and go into senescence
they infect cells and the infection causes cancer
they integrate into the genome and promote growth via the positional effect

3.In which of the following classes of genes do mutant genes fail to repress cell division?

Silencer genes
Oncogenes
Tumor suppressor genes
Operator genes
Promoter genes

4.The reason v-oncs cause cancer whereas normal c-oncs do not is because:

More than one v-onc occurs in the tumor cell
C-oncs are never expressed except when infected by a retrovirus
Expression of both the v-onc and the c-onc is enough to cause transformation
The v-oncs are expressed at much higher levels from the strong retroviral promoter than are c-oncs
All of these

5.Which of the following is the best example of a tumor-suppressor gene?

The RB gene involved in retinoblastoma
C-myc involved in Burkitt’s lymphoma.
Philadelphia chromosome in chronic myelogenous leukemia
Platelet-derived growth factor (PDGF)
C- ras involved in human bladder cancer