Biology
Which observation proves that a cell is a eukaryote?

It contains ribosomes
It has a cell membrane
It has DNA inside a nucleus
It contains DNA

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

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

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