AP BIOLOGY

BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Water makes up between 70-90% of the weight of most life forms, and nearly all chemicals present in living matter are soluble in it allowing for life to exist. Why is water such a good solvent?
A
The molecular structure of water is covalent.
B
The molecular structure of water is adhesive.
C
The molecular structure of water molecule is polar.
D
The molecular structure of water allows it to expand when frozen.
Explanation: 

Detailed explanation-1: -Water molecules have a polar arrangement of oxygen and hydrogen atoms-one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules.

Detailed explanation-2: -Water’s extensive capability to dissolve a variety of molecules has earned it the designation of “universal solvent, ” and it is this ability that makes water such an invaluable life-sustaining force. On a biological level, water’s role as a solvent helps cells transport and use substances like oxygen or nutrients.

Detailed explanation-3: -Explanation: Water is a universal solvent so as to speak where most of the organic compounds required by living beings can be made soluble. water is required for an organism to maintain temperature of the body. water is required for the chemical biology occurring in the cell.

Detailed explanation-4: -Water molecules are polar, so they form hydrogen bonds. This gives water unique properties, such as a relatively high boiling point, high specific heat, cohesion, adhesion and density.

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