Biology
Virus is not regarded as a cell,because

It is anactive unless it finds a host to multiply
Most of the cellular activity is absent
The genetic material does not replicate on its own
All of these

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Biology
Which one of the following statements regarding haemoglobin is correct?

Haemoglobin is only used for blood clotting and not for carrying gases
Haemoglobin of RBC can carry only carbon dioxide
Haemoglobin of RBC can carry both oxygen and carbon dioxide
Haemoglobin present in RBC can carry only oxygen but not carbon dioxide

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