Molecular Biology Exam 3 Study Guide:
Master DNA Purification, Cloning & Gel
Electrophoresis
Description:
Struggling to prepare for your Molecular Biology or QBM Exam 3? Our targeted study guide is
precisely what you need to conquer the core topics of Chapters 13, 14, and 15. We provide a
comprehensive review of DNA purification methods (like miniprep and phenol-
chloroform), agarose gel electrophoresis principles, and the entire recombinant DNA
technology pipeline—from restriction enzymes and ligation to vectors and gene libraries.
This resource is packed with 50+ detailed practice questions and answers that mirror what
you'll see on your test, covering everything from analyzing gel results to the purpose of specific
enzymes like DNA Ligase and Reverse Transcriptase. Whether your course is called Molecular
Biology, Biotechnology, or QBM, this guide cuts through the clutter and gives you the focused
review necessary to excel.
Stop stressing and start mastering the material. Download your ultimate exam prep guide now and
walk into your test with confidence!
, BIO 340 Exam 3 Study Guide: Plasmid Purification, Restriction
Enzymes & Vectors
Chapter 13 – DNA Purification, Agarose Gel Electrophoresis, and DNA Visualization
1. The molecular structures that store the genetic instructions for all living organisms are known as
____ ____.
a) amino acids
b) nucleic acids
c) lipids
d) carbohydrates
Answer: b) nucleic acids
Explanation: Nucleic acids, specifically DNA and RNA, are the biopolymers responsible for
storing and transmitting genetic information. Examples of their building blocks include purines
and pyrimidines.
2. A ______ is defined as the entire complement of genetic material present in an organism.
a) proteome
b) chromosome
c) genome
d) plasmid
Answer: c) genome
Explanation: The genome represents the complete set of genes or genetic material in an
organism. For instance, the human genome contains approximately 3 billion base pairs encoding
around 21,000 genes.
3. To isolate and study a specific gene from the vast background of genomic DNA, researchers
often begin by manipulating the gene to ______ it.
a) amplify
b) purify
c) sequence
d) transcribe
, Answer: b) purify
Explanation: Since a single gene is a tiny fraction of the total genome, the initial step in its
study often involves purification. This can be achieved by inserting the gene into a vector, like a
plasmid, for amplification and isolation.
4. Which of the following techniques is NOT primarily used for purifying or analyzing a specific
gene from a complex genome?
a) Polymerase Chain Reaction (PCR)
b) Proteinase K digestion
c) Southern Blotting
d) Gene library construction
Answer: b) Proteinase K digestion
Explanation: While Proteinase K is an enzyme used in DNA purification protocols to degrade
proteins, it is not a standalone technique for isolating a specific gene. Techniques like PCR, gene
libraries, and hybridization (e.g., Southern Blot) are designed to target and analyze specific
genes.
5. A key advantage in DNA purification is the molecule's resilience, allowing the use of ______
solvents to remove contaminants.
a) acidic
b) organic
c) basic
d) ionic
Answer: b) organic
Explanation: DNA is structurally robust and can withstand harsh conditions, including
treatment with organic reagents like phenol and chloroform, which are used to denature and
remove proteins and other cellular debris.
6. In the Phenol-Chloroform extraction method, the upper aqueous phase typically contains:
a) Proteins and cellular debris
b) Denatured enzymes
Master DNA Purification, Cloning & Gel
Electrophoresis
Description:
Struggling to prepare for your Molecular Biology or QBM Exam 3? Our targeted study guide is
precisely what you need to conquer the core topics of Chapters 13, 14, and 15. We provide a
comprehensive review of DNA purification methods (like miniprep and phenol-
chloroform), agarose gel electrophoresis principles, and the entire recombinant DNA
technology pipeline—from restriction enzymes and ligation to vectors and gene libraries.
This resource is packed with 50+ detailed practice questions and answers that mirror what
you'll see on your test, covering everything from analyzing gel results to the purpose of specific
enzymes like DNA Ligase and Reverse Transcriptase. Whether your course is called Molecular
Biology, Biotechnology, or QBM, this guide cuts through the clutter and gives you the focused
review necessary to excel.
Stop stressing and start mastering the material. Download your ultimate exam prep guide now and
walk into your test with confidence!
, BIO 340 Exam 3 Study Guide: Plasmid Purification, Restriction
Enzymes & Vectors
Chapter 13 – DNA Purification, Agarose Gel Electrophoresis, and DNA Visualization
1. The molecular structures that store the genetic instructions for all living organisms are known as
____ ____.
a) amino acids
b) nucleic acids
c) lipids
d) carbohydrates
Answer: b) nucleic acids
Explanation: Nucleic acids, specifically DNA and RNA, are the biopolymers responsible for
storing and transmitting genetic information. Examples of their building blocks include purines
and pyrimidines.
2. A ______ is defined as the entire complement of genetic material present in an organism.
a) proteome
b) chromosome
c) genome
d) plasmid
Answer: c) genome
Explanation: The genome represents the complete set of genes or genetic material in an
organism. For instance, the human genome contains approximately 3 billion base pairs encoding
around 21,000 genes.
3. To isolate and study a specific gene from the vast background of genomic DNA, researchers
often begin by manipulating the gene to ______ it.
a) amplify
b) purify
c) sequence
d) transcribe
, Answer: b) purify
Explanation: Since a single gene is a tiny fraction of the total genome, the initial step in its
study often involves purification. This can be achieved by inserting the gene into a vector, like a
plasmid, for amplification and isolation.
4. Which of the following techniques is NOT primarily used for purifying or analyzing a specific
gene from a complex genome?
a) Polymerase Chain Reaction (PCR)
b) Proteinase K digestion
c) Southern Blotting
d) Gene library construction
Answer: b) Proteinase K digestion
Explanation: While Proteinase K is an enzyme used in DNA purification protocols to degrade
proteins, it is not a standalone technique for isolating a specific gene. Techniques like PCR, gene
libraries, and hybridization (e.g., Southern Blot) are designed to target and analyze specific
genes.
5. A key advantage in DNA purification is the molecule's resilience, allowing the use of ______
solvents to remove contaminants.
a) acidic
b) organic
c) basic
d) ionic
Answer: b) organic
Explanation: DNA is structurally robust and can withstand harsh conditions, including
treatment with organic reagents like phenol and chloroform, which are used to denature and
remove proteins and other cellular debris.
6. In the Phenol-Chloroform extraction method, the upper aqueous phase typically contains:
a) Proteins and cellular debris
b) Denatured enzymes
