EXAM ALL ANSWERS AND
ILLUSTRATION GIVEN
what are the most abudant elements found in living organisms -
ANSWER ✔✔carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur
what is cohesion and adhesion - ANSWER ✔✔- cohesion: water
molecules can stick to other water molecules (high surface tension)
- adhesion: water molecules can stick to other types of molecules
equation for calculating pH - ANSWER ✔✔pH = -log(H+)
,equation for calculating H+ concentration from pH - ANSWER
✔✔(H+) = 10 to the -pH
what does the phosphate buffer do - ANSWER ✔✔present in the
intercellular fluid of all cells in the body
what does the carbonate buffer do - ANSWER ✔✔works to maintain
the pH of the blood (in bloodstream)
what does the protein buffer do - ANSWER ✔✔primary protein that
contributes to the body's buffering abilities is hemoglobin, which is found
in red blood cells
what is the dilution equation - ANSWER ✔✔C1 x V1 = C2 x V2
what is a peptide bond - ANSWER ✔✔binds proteins
between the acetyl group of one amino acid and the amino group of
another
list the monosaccharides - ANSWER ✔✔glucose, galactose, fructose
list the disaccharides - ANSWER ✔✔sucrose, maltose, lactose
list polysaccharides - ANSWER ✔✔starch, glycogen
, what bond forms fats and phospholipids - ANSWER ✔✔ester bond
connecting two fatty acid molecules and a glycerol
what are the elements of a nucleotide - ANSWER ✔✔phosphate
group, pentose sugar, nitrogenous base
what is a phosphodiester bond - ANSWER ✔✔binds nucleic acids
phosphate of one attaches to the sugar of the next
explain a sudan IV test - ANSWER ✔✔used to detect lipids
fatty acid chain will interact with sudan IV a nonpolar dye
produces a red-orange color
qualitative test (does not detect amount)
explain the benedict's test - ANSWER ✔✔- used to detect reducing
sugars
- initially clear deep blue color
- if mixture is heated and there is a reducing sugar, the reagent will turn
(green, yellow, orange, red, etc)
- quantitative test (red = more)
explain the biuret assay - ANSWER ✔✔- detects peptide bonds
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