Nucleic Acids - Mock Test 16

Question 151

The only correct statement about oncoviruses is?

A) All the oncoviruses are RNA viruses B) Reverse transcriptase is present in all oncoviruses C) Viral oncogenes are identical to human protooncogens D) Both DNA and RNA viruses can be oncoviruses

---

No Details

Question 152

Conversion of a procarcinogen into a carcinogen often requires?

A) Proteolysis B) Microsomal hydroxylation C) Exposure to ultraviolet radiation D) Exposure to X-rays

---

No Details

Question 153

Amplification of dihydrofolate reductase gene in a cancer cell makes the cell?

A) Susceptible to folic acid deficiency B) Less malignant C) Resistant to amethopterin therapy D) Responsive to amethopterin therapy

---

No Details

Question 154

Ames assay is a rapid method for detection of?

A) Oncoviruses B) Retroviuses C) Chemical carcinogens D) Typhoid

---

No Details

Question 155

All the following statements about retino blastoma are true except?

A) At least two mutations are required for its development B) One mutation can be inherited from a parent C) Children who have inherited one mutation develop retinoblastoma at a younger age D) RB 1 gene promotes the development of retinoblastoma

---

No Details

Question 156

Retinoblastoma can result from a mutation in?

A) ras proto-oncogene B) erbB proto-oncogene C) p 53 gene D) RB 1 gene

---

No Details

Question 157

P 53 gene?

A) A proto-oncogene B) An oncogene C) A tumour suppressor gene D) None of these

---

No Details

Question 158

Ras proto-oncogene encodes?

A) Epidermal growth factor (EGF) B) Receptor for EGF C) Signal transducer for EGF D) Nuclear transcription factor

---

No Details

Question 159

Ras proto-oncogene is converted into oncogene by?

A) A point mutation B) Chromosomal translocation C) Insertion of a viral promoter upstream of the gene D) Gene amplification

---

No Details

Question 160

Various oncogens may encode all of the following except?

A) Carcinogens B) Growth factors C) Receptors for growth factors D) Signal transducers for growth factors

---

No Details