BIOCHEM CHAPTER 11 EXAM11
A sample of cells has a total receptor concentration of 50 mM. Fifty percent of the
receptors have bound ligand and the concentration of free ligand is 5 mM. What is the
Kd for the receptor-ligand interaction? - CORRECT ANSWER-5 mM
lucose can be described as an aldohexose. Use similar terminology to describe the
following sugars: - CORRECT ANSWER-aldotetrose
D-gulose and D-idose are - CORRECT ANSWER-epimers
Which of the following are isomers of glucose? a. glucose-6-phosphate; b. fructose; c.
galactose; d. ribose. - CORRECT ANSWER-Only fructose and galactose are isomers of
glucose
The presence of the oligosaccharide raffinose (below) in beans is blamed for causing
flatulence when beans are consumed. Undigested raffinose is acted upon by bacteria in
the large intestine and produce gas as a metabolic by-product. Which glycosidic bond(s)
in raffinose are humans able to hydrolyze? Which bond(s) cannot be hydrolyzed -
CORRECT ANSWER-The α(1→6) linkage between galactose and glucose can be
hydrolyzed by humans, and a (1→2) glycosidic linkage between glucose and fructose
cannot be hydrolyzed by humans.
Changing the configuration of C3 of glucose generates a(n) - CORRECT ANSWER-
epimer
Lactose can be described as - CORRECT ANSWER-β-galactose (1→4) glucose
Cellulose is a rigid molecule as a result of - CORRECT ANSWER-interchain hydrogen
bonds
N-linked oligosaccharides - CORRECT ANSWER-are modified by glycosidases
The oligosaccharides of glycoproteins do all of the following except - CORRECT
ANSWER-catalyze chemical reactions
Which property of proteoglycans allows them to function as shock absorbers? -
CORRECT ANSWER-their hydrophilicity
Bacterial cells are surrounded by a cell wall made from - CORRECT ANSWER-
peptiodogylcan
The oligosaccharide groups of glycoproteins - CORRECT ANSWER-tend to be located
outside the cell
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