Biology
During the metaphase and anaphse stages of cell division,each chromosome comprises of two unseparated replicas known as the

Chromatids
Plastids
Tetrads
Chiasmata

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

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

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