PREP Exam Questions And Answers Verified
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solution - ANSWER homogenous mixture of two or more
substance
cant be separated & are transparent
ex: sugar water mixture
solute - ANSWER substance that makes up smaller part of the
solution
ex: sugar in a glass of water
solvent - ANSWER substance that makes up large part of
solution
ex: water
colloid suspension - ANSWER contains particles large enough to
scatter light and appear cloudy
can be separated by membrane but not by settling
gel like consistencies
emulsion - ANSWER one liquid suspended but not dissolved in
another liquid
often one liquid is water and the other is oil based
homogenous mixture of oil and water
carbohydrates - ANSWER important source of energy 3-8
carbon atoms and have a ketone (R2C=O) and aldehyde
(RCH=O)
sugars, starch, wood
, lipids - ANSWER fatty acids
long hydrocarbon carbon chain attached to carboxylic acid group
helps protect internal organs, long term energy storage saturated
and unsaturated
saturated fats - ANSWER single bond
solid at room temp
found in animals
unsaturated fats - ANSWER double bond
liquid at room temperature
found in plants
better than saturated fats
amino acids - ANSWER an amino group (NH2) and carboxylic
acid group (COOH)
building block for proteins
primary structure of protein - ANSWER held together by peptide
bonds
secondary structure - ANSWER refers to the way amino acids lie
next to each other in space
alpha helix, beta-pleated sheet, and triple helix
alpha helix - ANSWER held in place by hydrogen bonds
forms tight coil like telephone cord
beta-pleated sheet - ANSWER polypeptides held side by side by
a hydrogen bond between peptide chains