Advertisements
Advertisements
Question
In the given flow diagram, the replication of retrovirus in a host is shown. Observe and answer the following questions.
Fill in (1) and (2)
Why is the virus called retrovirus?
Can the infected cell survive while viruses are being replicated and released?

Advertisements
Solution
(a) 
(b) The virus is called retrovirus because it does not follow the central dogma of biology (DNA → RNA → Proteins). Its genetic material is RNA that is transcribed to DNA using enzyme reverse transcriptase.
(c) Yes, the infected cell can survive, while viruses are being replicated and released.
APPEARS IN
RELATED QUESTIONS
Cancer is one of the most dreaded diseases. Explain 'Contact inhibition' and 'Metastasis' with respect to the disease
Name any two techniques that are useful in detecting cancers of internal organs.
What is a carcinogen?
antiviral proteins released by cells infected by the virus are called ______.
Cancer of the epithelial cells is called ______.
Metastasis is associated with ______.
Blood cancer is called ______.
Chemotherapy: Chemicals: Radiation therapy: ______.
What is metastasis?
The cancer that generally affects lymph nodes and spleen is ______.
Cancers of connective tissues are called ______.
How do normal cells get transformed into cancerous neoplastic cells? Elaborate giving three examples of inducing agent.
In malignant tumors, the cells proliferate, grow rapidly and move to other parts of the body to form new tumors. This stage of disease is called ______.
AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV?
The immune system of a person is suppressed. In the ELISA test, he was found positive to a pathogen.
- Name the disease the patient is suffering from.
- What is the causative organism?
- Which cells of body are affected by the pathogen?
Cancer is generally caused due to activation of ______ to ______ and/or inactivation of ______.
The interferons are ______.
Name any two techniques used to detect the cancer of internal organs and write about any one of them.
Immunotherapy these days is one of the most efficient ways of treatment of cancer. The therapy involved activates the immune system and destroys the tumour.
- Write an example of one such biological response modifier used in immunotherapy.
- Why do patients need such substances if immune system is already working in body?
- State what is 'Contact inhibition'.
