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Biochemistry ACS Final Exam: Questions With Verified Solutions
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Biochemistry ACS Final Exam: Questions With Verified Solutions
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Biochemistry ACS Final Exam: Questions With VerifiedSolutions
What is the D configuration of a sugar in a Fisher projection? Right Ans -
chyrol carbon furthest from the carboxyl group
hydroxyl on right
What is the L configuration of a sugar in a Fisher projection? Right Ans -
hydroxyl on left
What is the difference between glycogen and amylopectin? Right Ans -
glycogen- has branches about every 10 residues (more highly branched)
amylopectin- has branches about every 25
What is amylose made up of? Right Ans - glucose
What makes up starch? Right Ans - amylose
amlyopectin
What is a glycosidic bond? Right Ans - links two monosaccharides together
at points 1 and 4
What is the difference between an alpha(1-4) and beta(1-4) linkage? Right
Ans - alpha: when the oxygen is pointed down in a glycosidic bond
beta: when the oxygen is pointed up in a glycosidic bond
What is the definition of a carbohydrate? Right Ans - all have hydroxyl and
carbonyl functional groups
Difference between aldose and ketose Right Ans - aldose has an aldohyde
ketose has a ketone
What makes up sucrose? Right Ans - fructose and glucose monosaccharides
, What makes up lactose? Right Ans - glucose and galactose
monosaccharides
What makes up mannose? Right Ans - two glucose monosaccharides
What are lipids? Right Ans - soluble in other nonpolar solvents (not water)
What are triglycerides composed of? Right Ans - glycerol and three fatty
acids
What is saponification? Right Ans - base hydrolysis of a triglyceride or
other fat
strong base is added
breaks ester linkages to release hydroxyls and form glycerol
What has a higher level of unsaturation -- oils or fats? Right Ans - oils
liquid at room temperature
What is the structure of the plasma membrane? Right Ans - hydrophylic
head
hydrophobic fatty acid tails
proteins span the phospholipid bilayer
Why type of amino acid is present in the plasma membrane among the fatty
acid tails? Right Ans - hydrophobic/nonpolar
What is passive transport (simple diffusion)? Right Ans - no energy
required
no protein required
move from high concentration to low concentration
water, gases, ethanol (small nonpolar) can pass through
What is facilitated diffusion? Right Ans - requires protein
no energy required
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