Download Enzyme and DNA Practice MULTIPLE CHOICE

Enzyme and DNA Practice
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Heavy metals such as Pb+2 or Hg +2 act as a(n) ________ inhibitor.
A) irreversible
B) reversible
C) noncompetitive
D) competitive
1)
2) A reversible inhibitor is one that:
A) binds permanently to the enzyme
C) denatures the enzyme
2)
B) binds temporarily to the enzyme
D) activates the enzyme
3) The area on the enzyme that interacts with the substrate is called the:
A) regulatory site
B) modulator site
C) active site
D) allosteric site
3)
4) When a molecule binds to an enzyme at a site other than the active site and affects enzyme
shape it is called a(n):
A) noncompetitive inhibitor
B) competitive inhibitor
C) irreversible inhibitor
D) covalent modification
4)
5) Penicillin is an example of a(n):
A) irreversible inhibitor
C) activator
5)
B) reversible inhibitor
D) noncompetitive inhibitor
6) The optimum pH for an enzyme such as pepsin (found in the stomach) that works to break
down peptide bonds would be:
A) acidic
B) basic
C) neutral
D) all of the above
6)
7) The optimum pH for an enzyme such as hexokinase that phosphorylates glucose in the blood
would be:
A) 2.0
B) 7.4
C) 9.0
D) none of these
7)
8) Increasing the temperature of an enzyme will:
A) denature it
C) slow down the reaction
8)
B) make the reaction rate increase
D) have no effect on the enzyme's activity
9) When a molecule binds to an enzyme at the active site and decreases the reaction rate, the
moleuclue is a (an):
A) noncompetitive inhibitor
B) competitive inhibitor
C) irreversible inhibitor
D) covalent modification
10) Asprin forms a covalent bond in the active site of cyclooxygenase. This inactivates the enzyme
permanently. Aspirin is a (an):
A) irreversible inhibitor
B) competitive inhibitor
C) reversible inhibitor
D) non competetive inhibitor
E) more than one of these
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9)
10)
11) What is the primary function of enzymes?
A) Neurotransmitters
C) Structure
11)
B) Biochemical catalysts
D) Transport
12) A feature that distinguishes ribose from deoxyribose is the absence of an OH at the:
A) 2'-carbon
B) 3'-carbon
C) 1'-carbon
D) 5'-carbon
12)
13) When adenine is connected to the deoxyribose sugar and a phosphate, its name becomes:
A) adenine
B) adenosine
C) adenosine monophosphate
D) none of the above
13)
14) A correct set of complimentary base pairs in DNA are:
A) AU
B) TC
C) AT
14)
D) GA
15) A correct set of complimentary base pairs in DNA are:
A) AU
B) GC
C) AG
D) TC
15)
16) The backbone of a nucleic acid strand consists of:
A) alternating nitrogen bases and phosphate groups linked by amide bonds
B) alternating sugar and nitrogen bases liked by peptide bonds
C) alternating sugar and phosphate groups linked by phosphate ester bonds
D) complimentary bases held together by hydrogen bonds
16)
17) The base pair adenine and thymine form how many hydrogen bonds with each other?
A) 1
B) 2
C) 3
D) 4
17)
18) The base pairs guanine and cytosine form how many hydrogen bonds with each other?
A) 1
B) 2
C) 3
D) 4
18)
19) Which type of RNA is involved in the process of transcription?
A) Transfer RNA
B) Ribosomal RNA
C) Messenger RNA
D) Viral RNA
19)
20) In order to make a protein a copy of the DNA must be done by which type of RNA?
A) Messenger RNA
B) Ribosomal RNA
C) Viral RNA
D) Transfer RNA
20)
21) The beginning process of protein synthesis by DNA is called:
A) translation
B) transcription
C) transfer
21)
D) copying
22) The second step of protein synthesis occurs in the ribosomes and is called:
A) translation
B) transcription
C) transfer
22)
D) copying
23) The type of RNA that contains the anticodon for an amino acid is called:
A) mRNA
B) rRNA
C) tRNA
D) vRNA
23)
24) The type of RNA that contains the amino acid covalently bound to it is called:
A) tRNA
B) rRNA
C) mRNA
D) vRNA
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24)
Answer Key
Testname: ENZYMEDNA
1) A
2) B
3) C
4) A
5) A
6) A
7) B
8) A
9) B
10) A
11) B
12) A
13) C
14) C
15) B
16) C
17) B
18) C
19) C
20) A
21) B
22) A
23) C
24) A
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