BIOL 2120 Chapter 19: Cell Biology Translation
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What step in DNA replication precedes the pairing of complementary bases?
A. | polymerization of DNA. | |
B. | formation of the histone core. | |
C. | mitotic division. | |
D. | separation of the two strands. | |
E. | joining of the two strands. |
In eukaryotes, transcription occurs in the
A. | ribosome. | |
B. | mitochondria. | |
C. | cell membrane. | |
D. | cytoplasm. | |
E. | nucleus. |
Normal human body cells contain how many chromosomes?
A. | 46 | |
B. | 22 | |
C. | 23 | |
D. | 44 | |
E. | 42 |
Hershey and Chase performed an experiment in which they used radioactive isotopes to phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that
A. | the viruses did not contain protein. | |
B. | genetic material normally contains radioactive isotopes. | |
C. | the viruses did not contain DNA. | |
D. | protein was entering into the infected bacteria. | |
E. | DNA was entering into the infected bacteria. |
A package of histones with DNA wrapped around them forms spherical structures called
A. | nucleosomes. | |
B. | lysosomes. | |
C. | ribosomes. | |
D. | nucleoli. | |
E. | chromatin. |
DNA replication
A. | does not require proteins. | |
B. | is constantly happening in a cell. | |
C. | occurs in G1 of interphase. | |
D. | takes place in the nucleus of the cell. | |
E. | occurs in the cytoplasm of the cell. |
The two subunits of the ribosome join during
A. | promotion of transcription. | |
B. | initiation of translation. | |
C. | termination of transcription. | |
D. | termination of translation. | |
E. | elongation. |
DNA replication of a single DNA molecule is referred to as semiconservative because
A. | each of the two DNA molecules will consist of one parental strand and one newly synthesized strand. | |
B. | all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA. | |
C. | it results in two nonidentical DNA molecules. | |
D. | of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA. | |
E. | one DNA strand is replicated continuously, while the other must be replicated discontinuously. |
The bases are bonded to what part of the backbone of the DNA molecule?
A. | the 4â carbon atom of the sugar molecule. | |
B. | the 3â carbon atom of the sugar molecule. | |
C. | the 5â carbon atom of the sugar molecule. | |
D. | the 1â carbon atom of the sugar molecule. | |
E. | the 2â carbon atom of the sugar molecule. |
View/perform/read ALL THREE of the following prior to answeringthe questions.
http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120078/micro10.swf::Stepsin Cloning a Gene (Links to an external site.)
http://www.discoverbiotech.com/wiki/-/wiki/Main/Applications ofCloning (Links to an external site.)
http://www.wiley.com/college/boyer/0470003790/animations/cloning/cloning.htm(Links to an external site.)
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From the list below, which of the following is the most logicalsequence of steps for splicing foreign DNA into a plasmid andinserting the plasmid into a bacterium?
I. Transformbacteria with recombinant DNA molecule
II. Cutthe plasmid DNA using restriction enzymes
III. Extractplasmid DNA from bacterial cells
IV. Hydrogen-bondthe plasmid DNA to nonplasmid DNA fragments
V. Useligase to seal plasmid DNA to nonplasmid DNA
IV, V, I, II, III |
III, II, IV, V, I |
III, IV, V, I, II |
II, III, V, IV, I |
I, II, IV, III, V |
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Plasmids (or vectors) are important in biotechnology becausethey are
a vehicle for the insertion of recombinant DNA intobacteria. |
surfaces for respiratory processes in bacteria. |
recognition sites on recombinant DNA strands. |
surfaces for protein synthesis in eukaryotic recombinants. |
proviruses incorporated into the host DNA |
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Plasmids are put into bacterial cells by
restriction enzymes |
DNA ligase |
binding of cohesive sticky ends |
transformation |
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Restriction enzymes usually
cut donor DNA evenly so smooth edges result |
cut donor DNA but do not affect plasmids |
make staggered cuts at specific sequences in DNA in both donorDNA and plasmid |
are used in ligating plasmids into bacterial host cells |
more than one of the above |
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After combining DNA fragments in a cloning experiment, ___ isused to covalently join the DNA segments.
Restriction enzyme |
DNA Ligase |
Reverse transcriptase |
DNA polymerase |
Helicase |
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It is theoretically possible for a gene from any organism tofunction in any other organism. Why is this possible?
All organisms have ribosomes. |
All organisms have the same genetic code. |
All organisms are made up of cells. |
All organisms have similar nuclei. |
All organisms have transfer RNA. |
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Assume that you are trying to insert a gene into a plasmid andsomeone gives you a DNA sample cut with restriction enzyme X. Thegene you wish to insert from the given sample has sites on bothends for cutting by restriction enzyme Y. You have a plasmid with asingle site for Y, but not for X. Your strategy should be to
cut the plasmid with restriction enzyme X and insert thefragments cut with Y into the plasmid. |
cut the plasmid with enzyme X and then insert the gene into theplasmid. |
cut the DNA again with restriction enzyme Y and insert thesefragments into the plasmid cut with the same enzyme. |
cut the plasmid twice with restriction enzyme Y and ligate thetwo fragments onto the ends of the human DNA fragments cut withrestriction enzyme X. |
insert the fragments cut with X directly into the plasmidwithout cutting the plasmid. |
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Which of the following is/are false in regard to expressionplasmids (also called expression vectors)?
They are used to make proteins using a cloned gene. |
They contain a promotor. |
They are the first plasmid type used to clone a gene. |
They contain a terminator. |
More than one of the above is false. |
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What is NOT a potential problem(s) associated with usingbacteria containing a cloned eukaryotic gene (e.g. a human gene) toproduce a functional protein?
If the eukaryotic gene contains introns the bacteria will notremove them and the resulting amino acid sequence will be differentthat that made by a eukaryote. |
The bacteria may not fold the protein correctly. |
The bacteria may degrade the protein. |
All of the above are potential problems. |
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Cloning allows for production of proteins in much larger amountsthan occurs in the cells from which the gene is isolated.
True |
False |
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Question 111 pts
Gene cloning is used to do all of the following except
Make insulin |
Making genetically identical animals (e.g. Dolly thesheep) |
Make vaccines |
Perform Gene Therapy |
Making genetically engineered plants |
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