Which one of the following depresses brain activity and produces feelings of calmness, relaxation, and drowsiness:
1. Valium
2. Morphine
3. Hashish
4. Amphetamines
AIDS is caused by HIV that principally infects:
1. Activator B cells
2. T4 lymphocytes
3. Cytotoxic T cells
4. All lymphocytes
Nucleic acid in HIV:
1. ss RNA
2. ds RNA
3. ss DNA
4. ds DNA
Typhoid caused by:
1. Rickettsiae
2. Chlamydia
3. Salmonella typhi
4. Mycobacterium
Histamine is secreted by:
1. | Mast cells | 2. | Fibroblast |
3. | Histiocytes | 4. | Plasma cells |
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