Biology Questions and Answers
Water and Mineral SaltsCarbohydrates.......................................................................................................................................................................................................................................
Salts
- What is the approximate
percentage (in mass) of water
in the human body? Is this
percentage expected to be
larger in the adult or in the old
individual?
Approximately 65% oindividual mass is water. Tf the humanhe brain, for (^)
example, mass, the muscles,has around 90% o 85%, anf water id the bonesn (^)
have between 25% and 40% of water.
Younger adult individuals haveproportionally more water in mass (^) than
older individuals.
- What are the main
biological functions of water?
Water is the fundamental solvechemical reactions of living beings; it isnt for (^)
the main transportation in tmeans of substancehe cell and between (^)
cells and tissues and it is responsible for
the maintetemperature for the functioninance of adequateng of the (^)
organism. Water is also the reagent or
the product of many biochemicalreactions, like photosynthesis, cellular (^)
respiration, peptide bond for protein
formation, etc.
- Water has key participation
in organic reactions. What are
examples of two types of
organic reactions in which
water is respectively
incorporated or liberated in
the products of these
reactions?
Photosynthesisin which water is incorporated is a biochemical processinto
organic molhydrogen atoms frecules. Iom water gn the reaction, tho to thee
produced glucose and the oxygen atoms
from water liberated: carboform the molecular on dioxide + water xygen+
light = glucose + molecular oxygen.
Aerobic rbiochemical reaction espiration is an in which water isexample of (^)
produced: glucose + = carbon dioxide + water.molecular oxygen
- Is water a polar or a non-
polar molecule? What is the
consequence of that
characteristic for the function
of water as solvent?
Water is made of two atoms of
hydrogen attached with one central atom by covalof oxygen makinent bond (^) g
an angular spatial structure. The
hydrogen atoms “lenoxygen and consequently this atomd” electrons to the
becomes more negative while the
hydrogens become more positive. Tspatial geometry of the water moleculehe (^)
makes it a polar molecule, with negative
and positive poles.
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