Biology Questions and Answers
Water is an excellent solvent for polar
substancesactivity (attraction because the electrical and repulsion) (^) of its
poles helps the separation and the
mixing of these substances,more movement and thus increasing giving themthe (^)
number of molecular collisions and the
speed of chemical reactions.other hand, water is not good as a On the
solvent for non-polar substances.
Polarity is one of the water properties.
- Which kind of polarity do
water-soluble and fat-soluble
substances respectively have?
Water-solublmolecules, i.e substancese., they have electrically are polar (^)
charged areas. These moldescription “water-soluble” becauseecules get the
they are soluble in water, a polar
molecule too.
Fat-soluble substances are non-polar
molecules, i.neutral. They get the descriptioe., they are electricallyn “fat-
soluble” because they dissolve other
non-polar substances.
- What is the importance of
water for enzymatic activity?
Enzymes, biological catalysts,on water to reach their substrates depend and (^)
bind to them. There is no enzymatic
activityenzymes depend on adequate pH without water. In addition,
interval to work consequence of the liberation oand the pH is af (^)
hydrogen cations (H+) and hydroxyl
anions (OH-) by acids and bases in
water solution.
- Can the heat capacity of
water be considered small or
large? What is the biological
significance of that
characteristic?
From Thermoloquantity of exchanged heat (Q) is egy it is known that thquale (^)
to the mass (m) mspecific heat of the substance (c)ultiplied by the
multiplied by the variation of
temperatuheat capacityre (T), Q = m.c.ΔT., an is Q/T, hence, m.c. Hd thateat
capacity, however, relates to a specific
body, since it considspecific heat relates to thers mass,e general whereas
substance. Thto refer to specific heerefore it is morat in this pe correctroblem.
Water has a which means that 1 oC per gram isspecific heat of 1 cal/g. oC
changed in its temperature with the
addition oenergy. This is a very elevated valr subtraction of 1 cal of (^) ue
(for example, the specific heat of
ethanol is 0,58 cal/g.metal, has a specific heat of 0,033oC, and mercury, a
cal/g. oC) making water an excellent
thermal prtemperature. Even if sudden externalotector against variations o f
temperature changes occur, the internal
biological conorganisms which ditionscontain e are kept stable innough water.
High specific heimportant water pat is one of the mostroperties.
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