Biology EXAM, || Questions Merged With
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What are carbohydrates and lipids? - ANSWER-Organic compounds
that are mostly composed of three types of atoms; carbon, hydrogen
and oxygen
What do carbohydrates do? - ANSWER-provide energy, in the form of
sugars like glucose and fructose, but they also make up structures like
cellulose, which form the cell wall of plant cells
What type of carbohydrate is the most important source of energy? -
ANSWER-mono-, di- and poly-saccharides
What are mono and disaccharides? - ANSWER-polar and soluble in
water
,What are polysaccharides? - ANSWER-Macromolecules resulting from
polymerization (condensation) of sugars and are not soluble in water
Examples of monosaccharides - ANSWER-ribose, glucose, fructose,
galactose
What forms a disaccharide? - ANSWER-two monosaccharides linked
together by condensation reactions with glycosidic bonds releasing
one H2O molecule
Alpha glucose structure - ANSWER-
Beta glucose structure - ANSWER-
Examples of Polysaccharides - ANSWER-cellulose, glycogen and starch
Monomer of Sucrose - ANSWER-glucose and fructose
monomer of maltose - ANSWER-glucose and glucose
monomer of lactose - ANSWER-glucose and galactose
monomer of starch - ANSWER-glucose
monomer of glycogen - ANSWER-glucose
monomer of cellulose - ANSWER-glucose
In animals, what carbohydrate stores energy? - ANSWER-glycogen
What jobs do carbohydrates have other than storing energy? -
ANSWER-structural components
What differs the polysaccharides all made up of glucose? - ANSWER-
they differ in the arrangement of glucose molecules and position of
the glycosidic bonds
, Starch arrangement - ANSWER-amylopectin branched, amylose linear
What is galactose? - ANSWER-a sugar in milk
What is fructose? - ANSWER-a sugar found in fruit and honey
Main characteristic of lipids? - ANSWER-little to no affinity to water,
mostly hydrophobic
What are the simple forms of lipids? - ANSWER-fat, oil and wax
What are lipids characteristics in different solvents? - ANSWER-they
are non-polar and insoluble in water, but soluble in organic solvents
What are triglycerides? - ANSWER-the main group of lipids. They are
formed by condensation reactions between one glycerol and three
fatty acids, creating ester bonds
What are the main types of triglycerides? - ANSWER-fats and oils. Fats
are solid and oil liquid at room temp
What are fatty acids? - ANSWER-carboxylic acids, possessing a -COOH
functional group
What are the two basic forms of fatty acids? - ANSWER-saturated and
unsaturated
What differs saturated from unsaturated fatty acids? - ANSWER-
Unsaturated fatty acids have double bonds; a monounsaturated
having one, whereas a polyunsaturated having multiple
What are cis and trans isomers? - ANSWER-cis having the double bond
elements on the same side, trans on opposite
Benefit of lipids over carbohydrates? - ANSWER-Lipids have a higher
energy content and can act as thermal insulators