Biochem Test Bank Ch 1 Key

Principles of Biochemistry, 5e (Moran/Horton/Scrimgeour/Perry/Rawn)

Chapter 1 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?

[pic]

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...