Question

Which of the following is not a characteristic of the human immunodeficiency virus?  

A. long incubation period;  

B. reverse transcriptase;  

C. broad host range;  

D. high rates of mutation and genetic variability.

Answer 1

•Let us see some characters of The human immunodeficiency virus (HIV).

1.It is an obligate intracellular parasite found exclusively in humans. It is responsible for weakening the immune system and leading to acquired immunodeficiency syndrome (AIDS).

2.HIV is spread by sexual contact or blood-to-blood contact. HIV is most commonly spread by sexual contact,

3.HIV is a retrovirus with a genome consisting of two identical RNA molecules linked in a dimeric structure. Retroviruses use an enzyme called reverse transcriptase to synthesize DNA that is then incorporated into the genome of the host cell, forming a provirus.

4.The infected person then may go asymptomatic for a long time, often many years. The average development of AIDS in western nations, if untreated, is about 10-12 years after the initial infection of HIV.

5.As the RNA is genetic material which is highly unstable as compare to DNA and having high range of mutation and genetic variability.

•From the above characters we can clearly see the answer is C, broad host range. Host is human only.

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