Escherichia and Agrobacterium are both used as vectors in genetic engineering. Nitrobact converts nitrites to nitrates. is a free living nitrogen fixing bacteria. Nitrosomonas converts ammonia to nitrite. Rhizobium is a symbiotic nitrogen fixing bacteria living in the root nodules of leguminous plants. Diplococcus pneumoniae causes pneumonia.

Correct Option: A

Escherichia and Agrobacterium are both used as vectors in genetic engineering. Nitrobact converts nitrites to nitrates. is a free living nitrogen fixing bacteria. Nitrosomonas converts ammonia to nitrite. Rhizobium is a symbiotic nitrogen fixing bacteria living in the root nodules of leguminous plants. Diplococcus pneumoniae causes pneumonia.

Plants developed by genetic engineering are called transgenic plants or genetically modified crops from which genetically modified food is produced. For their production micro-organisms (bacteria, virus) are used. So, by consuming them there is a danger of entry of viruses and toxins causing differ types of allergies and other health hazards to human beings.

Correct Option: D

Plants developed by genetic engineering are called transgenic plants or genetically modified crops from which genetically modified food is produced. For their production micro-organisms (bacteria, virus) are used. So, by consuming them there is a danger of entry of viruses and toxins causing differ types of allergies and other health hazards to human beings.

Plasmid is attached to mesosome in bacteria.

Correct Option: A

Plasmid is attached to mesosome in bacteria.

Prokaryotes (bacteria) have only circular chromosomes.

Correct Option: B

Prokaryotes (bacteria) have only circular chromosomes.

An RNA molecule whose base sequence is complementary to that of the RNA transcript of a gene, i.e. the sense RNA, such as a messenger RNA (mRNA). Hence, an antisense RNA can undergo base pairing with its complementary mRNA sequence. This blocks gene expression, either by preventing access for ribosome to translate the mRNA or by triggering degradation of the double stranded RNA by ribonuclease enzymes. Antisense RNA and DNA both have therapeutic potential for modifying the activity of disease causing genes.

Correct Option: C

An RNA molecule whose base sequence is complementary to that of the RNA transcript of a gene, i.e. the sense RNA, such as a messenger RNA (mRNA). Hence, an antisense RNA can undergo base pairing with its complementary mRNA sequence. This blocks gene expression, either by preventing access for ribosome to translate the mRNA or by triggering degradation of the double stranded RNA by ribonuclease enzymes. Antisense RNA and DNA both have therapeutic potential for modifying the activity of disease causing genes.