Which of the following statements is not true for retroviruses?
1. | Retroviruses carry the gene for RNA-dependent DNA polymerase |
2. | The genetic material in mature retroviruses is RNA |
3. | Retroviruses are causative agents for certain kinds of cancer in man |
4. | DNA is not present at any stage in the life cycle of retroviruses. |
Mast cells of connective tissue contain:
1. Heparin and histamine
2. Heparin and calcitonin
3. Serotonin and melanin
4. Vasopressin and relaxin
Cancer cells are more easily damaged by radiation than normal cells because they are:
1. | Undergoing rapid division | 2. | Different in structure |
3. | Non-dividing | 4. | Starved of mutation |
Which one of the following is not correctly matched:
1. Culex pipiens – Filariasis
2. Aedes aegypti – Yellow fever
3. Anopheles culifaciens – Leishmaniasis
4. Glossina palpalis – Sleeping sickness
HIV infects:
1. RBC
2. T – helper cells
3. B - cells
4. Basophils
During injury, mast cells secrete:
1. Histamine
2. Heparin
3. Prothrombin
4. Antibodies
What is a vaccine:
1. Treated bacteria, virus & protein
2. Treated algae
3. Treated fungi
4. Treated plasmodium
During viral infection, the protein formed in host cells to resist is:
1. Interferons
2. Antitoxin
3. Antibody
4. Histone
Cancerous cells can easily be destroyed by radiation due to the:
1. Rapid cell division
2. Lack of nutrition
3. Fast mutation
4. Lack of oxygen
The maximum application of animal cell culture technology today is in the production of:
1. Insulin
2. Interfereons
3. Vaccines
4. Edible proteins