24) The molecular mass of glucose (C6H 1206) is 180 g. Which of the following procedures
should you carry out to make a 0.5 M solution of glucose?
A) Dissolve 0.5 g of glucose in a small volume of water, and then add more water until the
total volume of solution is 1 L.
Dissolve 90 g of glucose in a small volume of water, and then add more water until the
total volume of the solution is 1 L.
C) Dissolve 180 g of glucose in a small volume of water, and then add more water until the
total volume of the solution is 1 L.
D) Dissolve 0.5 g of glucose in 1 L of water.
E) Dissolve 180 g of glucose in 1 L of water.
25) Which of the following statements is completely correct?
A) H2C03 is a weak acid, and Nao.H is a weak base (alkali).
H2C03 is a strong acid, and NaOH is a strong base (alkali).
C) NH3 is a weak base (alkali), and H2C03 is a strong acid.
D) NH3 is a weak base (alkali), and HCI is a strong acid.
E) NH3 is a strong base (alkali), and HCI is a weak acid.
26) If the pH of a solution is decreased from 9 to 8, it means that the
A) concentration of H+ has decreased to one-tenth (1/1 0) what it was at pH 9.
concentration of H" has increased 10-fold (1OX) compared to what it was at pH 9.
C) concentration of OH- has increased 10-fold (lOX) compared to what it was at pH 9.
D) concentration of Ol-I has decreased to one-tenth (1/10) what it was at pH 9.
E) Both B and D are correct.
27) Carbon dioxide (C02) is readily soluble in water, according to the equation C02 + H20 0
'H2C03. Carbonic acid (H2C03) is a weak acid. Respiring cells release C02. What prediction
can we make about the pH of blood as that blood first comes in contact with respiring cells?
A) Blood pH will decrease slightly.
Blood pH will increase slightly.
C) Blood pH will remain unchanged.
D) Blood pH will first increase, then decrease as C02 combines with hemoglobin.
E) Blood pH will first decrease, then increase sharply as C02 combines with hemoglobin.
28) Which of the following statements best describes the carbon atoms present in all organic
molecules?
A) They were incorporated into organic molecules by plants.
They we~e processed into sugars through photosynthesis.
C) They are ultimately derived from carbon dioxide.
D) Only A and C are correct.
E) A, B, and C are correct.
,
29) Which of the following contains nitrogen in addition to carbon, oxygen, and hydrogen?
A) an alcohol such as ethanol
a monosaccharide such as glucose
C) a steroid such as testosterone
D) an amino acid such as glycine
E) a hydrocarbon such as benzene
30) Which two functional groups are always found in amino acids?
A) ketone and aldehyde
carbonyl and carboxyl
C) carboxyl and amino
D) phosphate and sulfhydryl
E) hydroxyl and aldehyde
Chapter 5
31) Which of the following is not a polymer?
A) glucose
starch
C) cellulose
D) chitin
E) DNA
32) The molecular formula for glucose is C6H 1206. What would be the molecular formula for a
molecule made by linking three glucose molecules together by dehydration reactions?
A) C18H32016
C18H30015
C) C6HI005
D) C18HlO015
E) C3H603
33) On food packages, to what does the term "insoluble fiber" refer?
A) cellulose
polypeptides
C) starch
D) amylopectin
E) chitin
34) Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage
to one galactose molecule. How is lactose classified?
A) as a pentose
as a hexose
C) as a monosaccharide .,
D) as a disaccharide
E) as a polysaccharide
38) Large organic molecules are usually assembled by polymerization of a few kinds of simple
subunits. Which of the following is an exception to this statement?
A) a steroid
B) cellulose
C)DNA
D) an enzyme
E) a contractile protein