Test Bank – Principles of Biochemistry (5th Edition, Moran, Horton, Scrimgeour & Perry) | Complete Exam Questions & Answers (ISBN 9780321707338)

TEST BANK

PRINCIPLES OF BIOCHEMISTRY
5TH EDITION

CHAPTER NO. 01: INTRODUCTION TO BIOCHEMISTRY

1) Wohler showed that a chemical found only in living organisms can be made from inorganic
substances when he synthesized ________.
A) Ammonium cyanate
B) Amino acids
C) Urea
D) Uric acid
Answer: C
Page Ref: Section 1-1


2) The lock-and-key theory described the action of
A) enzymes as keys that fit different chemicals.
B) substrates as keys that fit different enzymes.
C) enzymes as locks that fit other enzymes.
D) substrates as locks that fit different enzymes.
Answer: B
Page Ref: Section 1-1


3) According to Crick's Central Dogma of molecular Biology, there can be NO transfer of
information from
A) DNA to RNA.
B) RNA to RNA.
C) RNA to protein.
D) protein to RNA.
Answer: D
Page Ref: Section 1-1

,4) What is the correct order in which these key breakthroughs in biochemistry occurred?
I. Watson and Crick DNA structure
II. Crick Central dogma
III. Avery, MacLeod and McCarty DNA work on Streptococcus
IV. Widespread use of computers
A) I, II, III, IV
B) III, I, II, IV
C) II, I, III, IV
D) IV, III, I, II
Answer: B
Page Ref: Section 1-1


5) Which elements account for more than 97% of the weight of most organisms?
A) C, H, N, Mg, O, S
B) C, H, N, O, P, S
C) C, H, N
D) Fe, C, H, O, P
E) Ca2+, K+, Na+, Mg2+, Cl-
Answer: B
Page Ref: Section 1-2

6) Which linkage(s) occur extensively in nucleotides?
A) Amide.
B) Phosphoanhydride.
C) Phosphate ester.
D) Ether.
E) Both B and C above.
Answer: E
Page Ref: Section 1-2

,7) Which functional group is shown?




A) Primary amine.
B) Acyl.
C) Amide.
D) Anhydride.
E) Nitrile.
Answer: C
Page Ref: Section 1-2


8) Proteins in biological membranes may be
A) porous.
B) attached to the membrane surface.
C) span the membrane.
D) all of the above.
E) B and C only.
Answer: D
Page Ref: Section 1-3


9) A dipeptide forms when a functional ________ group of one amino acid reacts with the
functional ________ group of another amino acid to form a ________ bond.
A) carboxylate, amino, double
B) carboxylate, amino, enzyme
C) amino, carboxylate, phosphate
D) amino, carboxylate, peptide
Answer: D
Page Ref: Section 1-3

, 10) Sugars such as glucose are monomers of polysaccharides that are linked together when
covalent bonds form between one ________ group of one sugar to the same group on another
sugar.
A) ester
B) carboxyl
C) amino
D) hydroxyl
Answer: D
Page Ref: Section 1-3


11) Which statement about cellulose is false?
A) It is the most abundant polysaccharide in nature.
B) Its monomers are joined by glycosidic bonds.
C) It is present in the stems of flowering plants.
D) The hydroxyl groups of neighboring cellulose molecules interact to form strong, insoluble
fibers.
E) It is a branched polymer of glucose.
Answer: E
Page Ref: Section 1-3


12) When Keq of a reaction = 1, then
A) the forward reaction is faster than the reverse reaction.
B) the reverse reaction is faster than the forward reaction.
C) the forward and reverse reaction rate constants are equal.
D) more products are formed than reactants.
E) fewer products are formed than reactants.
Answer: C
Page Ref: Section 1-4