BSC 2010 CH. 2 EXAM QUESTIONS AND 100%
CORRECT ANSWERS
A compound isolated from a biological source is subjected to chemical analysis. It contains
carbon and oxygen in roughly equal amounts and hydrogen in an amount that is almost
twice that of carbon. This compound does not take up iodine stain very well, indicating that
its structure is densely packed and resistant to large molecules binding to it through non
covalent interactions. What is the likely identity of this compound
glycogen
Based on information shown in the table, which triglyceride would be expected to have the
lowest melting point?
A triglyceride that contains one linoleic and two oleic fatty acids bonded to each glycerol
molecule
What is a biological role of both carbohydrates and lipids?
energy storage
Which linkages in starch and triglycerides result from condensation reactions?
Glycosidic bonds in starch and ester bonds in triglycerides
Table salt, NaCl, is neutral. When dissolved in water, NaCl
dissociates to form Na+ and Cl- ions that interact with water molecules
Phospholipids differ from triglycerides in that phospholipids
are amphipathic.
The reactivity of an atom arises primarily from the
existence of unpaired electrons in the outermost shell.
Entropy
is related to the disorder or randomness of a system.
The "building blocks" of polysaccharides are _______, and these blocks are covalently
linked together by _______.
monosaccharides; glycosidic linkages
The synthesis of complex molecules _______ energy, whereas their degradation _______
energy. This synthesis occurs with _______ in entropy.
requires; releases; a decrease
CORRECT ANSWERS
A compound isolated from a biological source is subjected to chemical analysis. It contains
carbon and oxygen in roughly equal amounts and hydrogen in an amount that is almost
twice that of carbon. This compound does not take up iodine stain very well, indicating that
its structure is densely packed and resistant to large molecules binding to it through non
covalent interactions. What is the likely identity of this compound
glycogen
Based on information shown in the table, which triglyceride would be expected to have the
lowest melting point?
A triglyceride that contains one linoleic and two oleic fatty acids bonded to each glycerol
molecule
What is a biological role of both carbohydrates and lipids?
energy storage
Which linkages in starch and triglycerides result from condensation reactions?
Glycosidic bonds in starch and ester bonds in triglycerides
Table salt, NaCl, is neutral. When dissolved in water, NaCl
dissociates to form Na+ and Cl- ions that interact with water molecules
Phospholipids differ from triglycerides in that phospholipids
are amphipathic.
The reactivity of an atom arises primarily from the
existence of unpaired electrons in the outermost shell.
Entropy
is related to the disorder or randomness of a system.
The "building blocks" of polysaccharides are _______, and these blocks are covalently
linked together by _______.
monosaccharides; glycosidic linkages
The synthesis of complex molecules _______ energy, whereas their degradation _______
energy. This synthesis occurs with _______ in entropy.
requires; releases; a decrease
