1 important components of some enzymes are cofactors Theyare: a-organic componen
ID: 5307 • Letter: 1
Question
1 important components of some enzymes are cofactors Theyare:
a-organic components b-metallic ions c- active sites d-substrates E- ribozymes
2- The RNA molecules that carry the genetic information from DNAto the ribosomes for protein synthesis are called
a-ribosomal RNA b-messenger RNA c- Transfer RNA D-primer RNA E-ribozymes
3-The most likely place where the endoezymes of glycolysis arelocated is in the
a-mitochondria b-cell membrane c- nucleus d- cytoplasm E-outside the cell
4-Regarding the structure of an Operon the non transcribed noncopied region of DNA to which the repressor binds to inhibittranscription is called the
A-promoter b-operator c- operon d- exon- e Intron
5- What is not true about enzymes?
a-They convert the substrate into product b- They lower theactivation energy c- They produce more product than without theenzyme D- They are biological catalysts E- They have differentcomponents
6-How do enzymes recognize their substrates?
A- By their shape
B- By their size
C- By their charge
D- By their cell location
E- By their size shape andcharge
7-The RNA molecules that carry amino acids to the ribosomesduring proteins synthesis are called
A-ribosomalRNA c-transfer RNA
B-messengerRNA d-primer E-ribozymes
8-Which is incorrect about inducible operons?
A. They are often for catabolicpathways
B. They are normally turnedoff
C. They are turned on by thesubstrate of the enzyme
D. They include the lac operon
E. All are correct
9-what is the function of the co-factor portion of theenzyme?
a. To assist in binding thesubstrate
b. To aid in the transfer of theelectrons
c. To aid in releasing theproduct of the reaction
d. To help bind ATP
e. None of the above
10- In this reaction from glycolysis how is ATP formed?
Phosphoenol pyruvate +ADP ----------à Pyruvate +ATP
a- Oxidative phosphorylation
b- Fermentation
c- Preparation for theKreb’s cycle
d- Kreb’s cycle
e- Subtrate-levelphosphorylation
11- A mutation that changes a normal codon to a codon that codesfor a different amino acid is called a(n)
a-deletion
b-silent mutation
c-insertion
d-missense mutation
e-nonsense mutation
12- A mutation that changes a normal codon to a stop codon iscalled a
a. Point mutation
b. Silent mutation
c. Back mutation
d. Missense mutation
e. Nonsense mutation
13-The Ames Test is designed to
a. determine the rate of DNAreplication in various bacterial species
b. detect the presence of aprophage in a cell
c. detect if a cell isinfected by a virus
d. determine if a cell isresistant to an antibiotic
e. detect chemicals withcarcinogenic or mutagenic potential
14- In prokaryotic cells the electron transport system islocated in the
a. cell membrane
b. mitochondria
c. endoplasmic reticulum
d. ribosomes
e. cytoplasm
15- Choose the best answer to complete the sentence. Anaerobiccellular respiration….
a. Untilizes the citric acidcycle
b. Only involves glycolysis
c. Uses pyruvate as theterminal electron acceptor
d. Utilizes the electron transportsystem.
e. Uses inorganic molecules as theterminal electron acceptor.
16-If the DNA template sequence is 5’ATTCCGGA3’, themRNA transcript would be
a. 3’TAAGGCCT5’
b. 3’UAAGGCCU5’
c. 5’ATTCCGGA5’
d. 5’UCCGGAAU3’
e. 5’TAAGGCCT3’
17-Which of the following is the best definition ofrespiration?
a. The reduction of glucoseto pyruvic acid using NADH
b. The incomplete oxidation ofglucose to pyruvic acid
c. The oxidation of glucoseto co2 with oxygen as the final electron acceptor
d. The reduction of pyruvic acidto lactate using NADH
e. The production of ATP byoxidative phosphorylation
18- Which of the following is the best definition offermentation?
a. Sequential oxidationreduction reactions in glucose metabolism with lactic acid moleculeas the final electron acceptor
b. Sequential oxidation reductionreactions in glucose metabolism with an inorganic molecule asthe final electron acceptor
c. A method of generatingmuch ATP by substrate level phosphorylation
d. The complete oxidation ofglucose with pyruvic acid as the final electron acceptor
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