EXAM 1 Flashcards
A reaction that has a negative ΔG
is spontaneous.
Fatty acids are
carboxylic acids with long hydrocarbon tails.
Oils and fats
are triglycerides
Which of the following statements about starch is false?
The properties of starch are very similar to those of cellulose.
The synthesis of complex molecules _______ energy, whereas their degradation _______ energy. Synthesis occurs with _______ in entropy.
requires; releases; a decrease
A phospholipid differs from a triglyceride in that phospholipids
are amphipathic.
Which of the following biological molecules are linked by covalent bonds formed by the removal of the elements of water from the reactants (a kind of condensation reaction)?
Oils
Fats
Proteins
Starch
The “building blocks” of polysaccharides are _______, and the blocks are covalently linked together by _______.
monosaccharides; glycosidic linkages
The stability of the three-dimensional shape of many large molecules is dependent on
hydrogen bonds.
Which of the following statements about chemical reactions is true?
The bonding partners of atoms change.
Which of the following is not a polymer?
A lipid
Cellulose and starch are composed of the same monomers but have structural and functional differences. Which of the following is the characteristic that accounts for those differences?
Different types of glycosidic linkages
Which of the following statements concerning energy transformations is true?
Increases in entropy reduce usable energy.
Which of the following physiological functions is not usually served by proteins?
Energy reserve
Quaternary structure of proteins refers to
the number and kind of polypeptide subunits the protein has.