Practice free Human Health and Diseases (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which statement about memory B and T-cells in the context of vaccination is correct?
The text states, 'The vaccines also generate memory – B and T-cells that recognise the pathogen quickly on subsequent exposure and overwhelm the infect ng a.
If a person is injected with pre-formed antibodies against a certain disease, what happens to their immune system's long-term memory for that specific disease?
Passive immunity involves the direct administration of ready-made antibodies. The host's immune system is not stimulated to produce its own antibodies or memory cells. Therefore, no long-term memory is established.
What would be the most suitable method to provide immediate protection against a rapidly acting toxin?
For immediate protection, passive immunity is required, where ready-made antibodies are directly given. Active immunity (o1, o3) is slow and takes time to develop. Innate immunity (o4) is non-specific.
Which of the following properties is characteristic of normal cells but is lost in cancerous cells?
Normal cells show a property called contact inhibition, by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appear to have lost this property, leading to uncontrolled division.
Metastasis, the most feared property of malignant tumors, refers to:
Cells sloughed from malignant tumors reach distant sites through blood, and wherever they get lodged in the body, they start a new tumor there. This property is called metastasis and is the most feared property of malignant tumors.
Which of the following is NOT considered a carcinogen that can induce the transformation of normal cells into cancerous neoplastic cells?
Ionising radiations like X-rays and gamma rays, and non-ionising radiations like UV cause DNA damage leading to neoplastic transformation. Chemical carcinogens in tobacco smoke are also identified. Alpha-interferon, however, is a biological response modifier used in cancer treatment to activate the immune system.
Cellular oncogenes (c-onc) or proto-oncogenes are genes found in normal cells that:
Several genes called cellular oncogenes (c-onc) or proto-oncogenes have been identified in normal cells which, when activated under certain conditions, could lead to oncogenic transformation of the cells.
Which diagnostic technique uses strong magnetic fields and non-ionising radiations to accurately detect pathological and physiological changes in living tissue?
MRI uses strong magnetic fields and non-ionising radiations to accurately detect pathological and physiological changes in the living tissue.
A patient undergoing cancer treatment experiences side effects such as hair loss and anemia. This is characteristic of which common cancer treatment approach?
Several chemotherapeutic drugs are used to kill cancerous cells. Majority of these drugs have side effects like hair loss, anemia, etc.
Biological response modifiers like alpha-interferon are administered to cancer patients primarily to:
Patients are given substances called biological response modifiers such as alpha-interferon which activates their immune system and helps in destroying the tumor.
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