Biology Mcqs Online Test 5

__ is essential for the formation of hemoglobin?

_____ are needed as a source of energy for the vital activities of the body?

Oxygen accounts for ____ % of totals human body mass?

Haemodialysis means cleaning of?

The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called ?

Blood is carried towards the heart by __________?

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Which one of them is a micro-molecule?

Out of 92 naturally occurring chemical elements how many are considered as bio-elements?

A structure formed by groups of similar cells organized into loose sheets or bundles performing similar functions is called as:

The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called: