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[A] : AIDS virus is highly mutable [R...

[A] : AIDS virus is highly mutable
[R] : It lacks DNA polymerase to repair its mutated genome

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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At which phase of the cell cycle, DNA polymerase activity is an its highest?

[A] : Viruses are obligate parasites . [R] : Both DNA and RNA are present in a virus .

[A] : Infective part of virus is its nucleic acid . [R] : During infection , only the nucleic acid of virus enters in to the host cell .

Assertion :- Beside hiigh rate of polymerisation of nucleotides DNA polymerase have to catalyse the reaction with high degree of accuracy. Reason : Any mastake during replication wold results into mutations.

Select the incorrect statements regarding AIDS from the following: I. AIDS is caused by a retrovirus have two molecules of single-stranded RNA as its genome. II. AIDS can be successfully treated using anti-retroviral drugs III. Macrophages act as a viral factory as it leads to the continuous production of new viral particles. IV. In AIDS, a decrease in B-lymphocyte count is seen.

Consider the following statements with respect to PCR. A. PCR is now routinely used to detect HIV in suspected AIDS patients. B. PCR is being used to detect mutations in genes in suspected cancer patients. C. PCR involves the amplification of mRNA. D. In PCR repeated amplification of RNA is achieved by the use of a thermostable RNA polymerase. Of the above statement:

Assertion (A): The enzyme involved in the continuous replication of DNA strand is DNA polymerase. Reason (R): The polarity of the template strand is 3 to 5' .

Assertion : AIDS is a disorder caused by HIV. Reason : HIV is a virus that damage the immune system of its host.

Rearrange the following in the correct sequences to accomplish an important biotechnological reaction: a) In vitro synthesis of copies of DNA of interest b) Chemically synthesized oligonucleotides. c) Enzymes DNA polymerase c) Complementary region of DNA. e) Genomic DNA template f) Nucleotides provided. g) Primers h) Thermostable DNA-polymerase (from Thermus aquaticus). i) Denaturatioin of ds-DNA.

TRUEMAN BIOLOGY-Viruses -ASSERTION AND REASON
  1. [A] : Viruses are obligate parasites . [R] : Viruses can not multipl...

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  2. [A] : Viruses are not included in any kingdom of classification . [R...

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  3. [A] : Viruses are easily killed by strong broad spectrum antibiotics ....

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  4. [A] : Outside the host , viruses do not survive . [R] : Viruses are ...

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  5. [A] : AIDS virus is highly mutable [R] : It lacks DNA polymerase to...

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  6. [A] : Infective part of virus is its nucleic acid . [R] : During inf...

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  7. [A] : Viruses are exception to cell theory . [R] : Viruses don't hav...

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  8. [A] : SARS Originated in China . [R] : China is most crowded country...

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  9. [A] : Viruses are not considered organisms . [R] : Viruses lack cyto...

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  10. [A] : Viruses lack any kind of enzymatic machinery . [R] : They can ...

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  11. [A] : Viruses are causative organisms of measles and rabies . [R] : ...

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  12. [A] : Viruses are not considered organisms . [R] : Viruses are mere...

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  13. [A] : All RNA viruses cannot directly multiply in host cells . [R] :...

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  14. [A] : Some viruses cause cancer . [R] : Cancer viruses trigger uncon...

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  15. [A] : Viruses are obligate parasites . [R] : Both DNA and RNA are pr...

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  16. [A] : Subviral infectious agents are called viroids . [R] : Viroids ...

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  17. [A] : The Phages which caused lysis of bacterial cell are called virul...

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  18. [A] : AIDS is called death warrant . [R] : AIDS virus has a liking f...

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  19. [A] : Virion is the virus particle outside the host cell. [R] : They...

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  20. [A] : Virus free plants can be produced from virus infected plants by ...

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