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exam 2 biochem Exam 2024/2025 Questions With Completed & Verified Solutions.
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exam 2 biochem Exam 2024/2025 Questions With Completed & Verified Solutions.
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exam 2 biochemhow many stereoisomers are possible for an aldohexose - ANS 16
Which of the following sugars contains a b-1,4-linkage - ANS cellulose
In glycolysis_______moles of NADH are produced per mole of glucose - ANS 2
Which of the following is required for the conversion of UDP-glucose to glycogen - ANS
glycogen synthase, branching enzyme (both A and B are correct)
Which of the following polysaccharides can bind exceptionally large amounts of water - ANS
heparin
Lactose intolerance arises from - ANS the inability of intestinal enzymes to cleave the lactose
The accumulation of AGEs is linked to which of the following diseases? - ANS Arthritis,
diabetes, and atherosclerosis (all of the above)
Cellulose is indigestible to most animals because - ANS Animals do not have the enzymes
needed to hydrolyze the B-glycosidic linkages between the monomer units
Glycogen is - ANS Main carbohydrate reserve in animals
A glycosidic link is chemically an - ANS ether
Both glycogenesis and glycogenolysis are controlled primarily by the interplay between the two
hormones insulin and ________. - ANS glucagon
which of the following carbohydrates is a nonreducing sugar - ANS sucrose
the most abundant organic substance on earth is - ANS cellulose
Reaction of an amino acid with C1 of a cyclic aldose produces which of the following linkages? -
ANS glycosidic
Fructose-2,6-biphosphate - ANS is an indicator of high cellular glucose concentration
the three most common homoglycans found in nature are cellulose, starch, and_______ - ANS
glycogen
which of the following is not a homoglycan - ANS Heparin
, The preferred energy source of the brain is - ANS glucose
Under stressful conditions epinephrine is released from the adrenal medulla. THe release of
epinephrine has which of the following effects on glucose metabolism? - ANS all of the above
(glycogenolysis is stimulated, Adenylate cyclase is activated, glycogenesis is inhibited)
Glycoconjugates result from the covalent linkage of carbohydrate to proteins or - ANS lipids
which of the following yields N-acetyl-D-glucosamine on hydrolysis - ANS chitin
In glycoproteins carbohydrate is most often linked to threonine, asparagine or - ANS serine
The presence of which of the following molecules indicates that the cell has sufficient energy
reserves - ANS both A and B (both ATP and citrate)
glycoproteins lack which of the following groups typically found in proteoglycans - ANS both A
and B are correct (uronic acid and sulfate groups)
An enzyme family called the _____ catalyzes the phosphorylation of hexoses in the body. - ANS
hexokinases
Most aminotransferaes utilize ________as the recipient a-keto acid. - ANS alpha-ketogluterate
Plasma lipoproteins transport______through the blood from one organ to another - ANS
triaclyglycerols, phospholipids, and cholesterol esters (all of the above)
The b-oxidation of fatty acids requires - ANS coenzyme A, FAD, NAD+ ( all of the above)
The glutamate family of amino acids includes all of the following except - ANS lysine
A membrane's fluidity is largely determined by the percentage of - ANS unsaturated fatty acids
which of the following is not likely to be a naturally occurring fatty acid - ANS C14H29COOH
All of the following are purine bases except - ANS Thymine
In the fluid mosaic model of membrane structure - ANS the proteins "float" in the lipid bilayer
Covalently bound chains with______ or more ubiquitin monomers are required to transfer a
protein to the proteosome - ANS 4
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