Biology 11 Chapter 2
Biological Molecules - 5
1.
Which Element is not found in living organisms?
a) V
b) CH
c) Mo
d) Si
e) I
2.
The six commonest bio elements which account for 99% of biomass are (pick the wrong answer)?
a) Hydrogen & nitrogen
b) Oxygen & carbon
c) Water and proteins
d) Calcium & phosphorus
3.
Today chemists recognize _______ elements occurring in nature?
a) 91
b) 92
c) 93
d) 90
4.
How many of the total natural elements are essential to life?
a) 26
b) 25
c) 23
d) 22
5.
Four of the following elements make up about 96.3% of the human body (pick the wrong one)?
a) Carbon
b) Calcium
c) Nitrogen
d) Hydrogen
e) Oxygen
6.
Human body is?
a) Stable
b) Flexible
c) Typical of living matter
d) Strong
7.
These are essential to at least some organisms but only in minute quantities?
a) Hydrogen & nitrogen
b) Oxygen & carbon
c) Trace elements
d) Calcium & phosphorus
8.
Some trace elements are needed by?
a) Certain species
b) All forms of life
c) Not required at all
d) Two answers are correct
9.
The structure and function of cells depend on ________ , which form the Cells?
a) Various chemicals
b) Various biochemicals
c) Trace elements
d) Certain species
10.
What percentage of a typical mammalian cell consists of water?
a) 80%
b) 75%
c) 60%
d) 70%
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