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Biochemistry ACS Final Exam Questions and Answers Fully Solved
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Biochemistry ACS Final Exam
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Biochemistry ACS Final ExamWhat is the D configuration of a sugar in a Fisher projection? - answerchyrol carbon
furthest from the carboxyl group
hydroxyl on right
What is the L configuration of a sugar in a Fisher projection? - answerhydroxyl on left
What is the difference between glycogen and amylopectin? - answerglycogen- has
branches about every 10 residues (more highly branched)
amylopectin- has branches about every 25
What is amylose made up of? - answerglucose
What makes up starch? - answeramylose
amlyopectin
What is a glycosidic bond? - answerlinks two monosaccharides together at points 1 and
4
What is the difference between an alpha(1-4) and beta(1-4) linkage? - answeralpha:
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? - answerall have hydroxyl and carbonyl
functional groups
Difference between aldose and ketose - answeraldose has an aldohyde
ketose has a ketone
What makes up sucrose? - answerfructose and glucose monosaccharides
What makes up lactose? - answerglucose and galactose monosaccharides
What makes up mannose? - answertwo glucose monosaccharides
What are lipids? - answersoluble in other nonpolar solvents (not water)
, What are triglycerides composed of? - answerglycerol and three fatty acids
What is saponification? - answerbase 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? - answeroils
liquid at room temperature
What is the structure of the plasma membrane? - answerhydrophylic 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? -
answerhydrophobic/nonpolar
What is passive transport (simple diffusion)? - answerno energy required
no protein required
move from high concentration to low concentration
water, gases, ethanol (small nonpolar) can pass through
What is facilitated diffusion? - answerrequires protein
no energy required
molecules are two large to go through on their own
What is active transport? - answerenergy is required
moves from low to high concentration
How many carbon atoms do most fatty acids have? - answereven number
What bond holds nucleotides together? - answerphosphodiester bond
What base pairing exists in nucleic acids? How many hydrogen bonds between them? -
answerG--C (3 hydrogen bonds)
A--T (2 hydrogen bonds)
What is the first amino acid always placed in a protein? - answermethionine (Met)
start codon
What 3 things make up a nucleotide? - answernitrogen base
phosphate group
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