Human Reproduction — BIOLOGY STD 12 Science — Question

Why is the enzyme cellulase used for isolating genetic material from plant cells but not for animal cells?

What is a mutagen? Give one example.

The nematode that infests and damages tobacco roots:

1. Ascaris megalocephala.
2. Ancylostoma.
3. Meloidegyne incognitia.
4. Trichinella.

From which galaxy did the Earth originate?

Mark the odd one in the following group.
Har Gobind Khorana, Marshal Nirenberg, Severo Ochoa, Alec Jeffreys.

Mark the odd one in the following group.
Phytoplanktons, Zooplanktons, Reed-swamp stage, Lichens.

Expand ELISA:

1. Enzyme linked inductive assay
2. Enzyme linked ion sorbent assay
3. Enzyme linked immunosorbent assay
4. None of the above

Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

OR

Name two viral diseases transmitted by Aedes mosquito.

Name the negatively charged and positively charged components of a nucleosome.

OR

Name the positively charged protein around which the negatively charged DNA wrapped.

Name the enzyme needed for amplification of gene during PCR?