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Bio 311C- Sata Exam Practice Questions, all Solved 100% Correct with Verified Answers
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Bio 311C- Sata Exam Practice Questions, all Solved 100% Correct with Verified Answers
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Bio 311C- Sata Exam Practice Questions, all Solved100% Correct with Verified Answers
What is the relation between the properties of water and H-bonding? How do they help
support life on earth? - ✔✔Water molecules have two partial positive and two partial
negative charges, allowing for 4 counts of hydrogen bonding, and thus water molecules can
bond with up to four other water molecules. The H-bonding is strong in water and is the main
reason for its unique properties.
Properties of Water - ✔✔cohesiveness
adhesiveness
high specific heat
high heat of vaporization
freezing and expansion
versatile solvency
medium for biochemical reactions
ingredient of many biochemical reactions
cohesiveness - ✔✔due to the constant forming and breaking of H-bonds in liquid water, H2O
molecules stick together
- important for water uptake ( transport from roots ) and imbibition ( water absorption by seeds
)
adhesiveness - ✔✔water can adhere to surfaces
- important for the attachment of water ( adsorption ), which leads to absorption
, high specific heat - ✔✔1 cal/g/C°
Water can absorb and release heat to stabilize the temperature in the surrounding area,
making it habitable.
high heat of vaporization - ✔✔it takes lots of energy to evaporate water, which is important
in evaporative cooling in animals and plants in hot weather.
freezing and expansion - ✔✔as water freezes, it expands, becoming less dense; the resulting
ice floats on the top of the water, keeping water below warmer, and thus providing a favorable
environment for aquatic organisms during freezing cold conditions
versatile solvent - ✔✔water is an excellent solvent for all polar and charged molecules
because of its polarity
minerals and nutrients dissolved in water are available for easy uptake and transport by plants
and animals.
medium for biochemical reactions - ✔✔living cells contain up to 95% water so many
biochemical reactions in a cell occur under aqueous conditions
ingredient of many biochemical reactions - ✔✔many biochemical reactions need water as a
reactant
Ex: photosynthesis, hydrolysis
How to prepare solutions of different molar concentrations when given a molecular weight,
percent weight, volume solution, etc. - ✔✔MW (g/mol) X M (mol/L) x L = g
From stock solution to a diluted solution - ✔✔C1V1 = C2V2
C1 - concentration of stock solution
V1 - volume of stock solution
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