Biology Mcqs Online Test 5

Blood is carried towards the heart by __________?

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

__ is essential for the formation of hemoglobin?

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

Which one of them is a micro-molecule?

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

Oxygen accounts for ____ % of totals human body mass?

Haemodialysis means cleaning of?

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

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