What indicates binding of a probe in the autoradiogram?
Dark spots on the nitrocellulose paper.
What technique is used to analyze protein expression levels between two samples?
Two-dimensional gel electrophoresis.
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p.7
Gene Therapy Applications

What indicates binding of a probe in the autoradiogram?

Dark spots on the nitrocellulose paper.

p.9
Proteomics and Protein Analysis

What technique is used to analyze protein expression levels between two samples?

Two-dimensional gel electrophoresis.

p.1
Ferritin Synthesis Regulation

What happens to ferritin mRNA when IRE-BP binds iron?

IRE-BP dissociates from IRE, allowing the mRNA to be translated.

p.1
Transferrin Receptor Synthesis

How is the degradation of transferrin receptor mRNA regulated?

Binding of IRE-BP to IRE prevents degradation of the mRNA; when iron levels are high, IRE-BP binds iron and the mRNA is rapidly degraded.

p.1
Viral Infections and Treatment

What is the function of Azidothymidine (AZT) in treating viral infections?

AZT inhibits retroviral reverse transcriptase by serving as a DNA chain terminator.

p.9
Viral Infections and Treatment

What follows the initial ELISA in HIV testing?

A Western blot using purified HIV proteins.

p.8
Gene Therapy Applications

What are single nucleotide polymorphisms (SNPs)?

SNPs are base changes in the genome that must be present in at least 1% of the population and are useful for mapping disease genes and forensic analysis.

p.5
DNA Sequencing Methods

What is the role of dideoxynucleotides in DNA sequencing?

They compete with normal nucleotides for incorporation, producing DNA chains of varying lengths.

p.5
Polymerase Chain Reaction (PCR)

What is PCR and its primary use?

PCR is an in vitro technique used for rapidly producing large amounts of DNA, suitable for clinical or forensic testing.

p.4
DNA Sequencing Methods

What is the function of DNA polymerase in the Sanger method?

It catalyzes the polymerization of the DNA chain.

p.7
Restriction Enzymes and DNA Fragmentation

What does the length of the restriction fragments depend on in the VNTR analysis?

The number of repeats in each allele.

p.7
Gene Therapy Applications

What does the probe for the mutant region of the CF gene bind to?

Only to the DNA from a person with cystic fibrosis.

p.7
Gene Therapy Applications

What is the result when both probes are used on DNA from a carrier of cystic fibrosis?

Both probes bind, indicating one normal allele and one CF mutation.

p.2
DNA Sequencing Methods

What technique uses labeled DNA to identify homologous sequences?

Hybridization.

p.3
DNA Sequencing Methods

What is the difference between polyacrylamide and agarose gels?

Polyacrylamide gels separate short DNA chains that differ by one nucleotide, while agarose gels separate larger DNA chains.

p.2
Restriction Enzymes and DNA Fragmentation

What characteristic do most DNA sequences recognized by restriction endonucleases have?

They are palindromes.

p.2
Recombinant DNA Techniques

What is the role of DNA ligase in recombinant DNA technology?

To join DNA fragments that have complementary single-stranded regions.

p.4
DNA Sequencing Methods

What is the significance of the 3' hydroxyl group in DNA polymerization?

It is necessary for the addition of nucleotides; dideoxynucleotides lack this group, causing termination.

p.5
Recombinant DNA Techniques

How is foreign DNA used in cloning?

It can be inserted into a DNA vector and used to transform rapidly growing cells, usually bacteria.

p.2
Polymerase Chain Reaction (PCR)

What technique allows for the amplification of large quantities of DNA?

Polymerase chain reaction (PCR).

p.6
Polymerase Chain Reaction (PCR)

How does PCR testing for mutations work?

An oligonucleotide primer complementary to a mutant region is used; if it binds, amplification occurs, indicating the presence of the mutation.

p.8
Gene Therapy Applications

How can transgenic animals be produced?

By inserting a gene from another organism into a fertilized egg.

p.3
DNA Sequencing Methods

What is a Northern blot?

A technique where a radioactive DNA probe hybridizes with RNA on a nitrocellulose blot of a gel.

p.8
Proteomics and Protein Analysis

What does proteomics study?

The identification and analysis of all proteins expressed by a given cell under specific conditions.

p.7
Restriction Enzymes and DNA Fragmentation

What technique is used to analyze restriction fragments produced from a gene with variable number tandem repeats (VNTR)?

Electrophoresis.

p.9
Proteomics and Protein Analysis

What is the purpose of using protein mass spectrometry in this context?

To identify proteins whose expression levels change.

p.6
Restriction Enzymes and DNA Fragmentation

How can DNA fingerprinting be used?

It can identify individuals with the accuracy of a fingerprint, determine parentage, or implicate suspects in criminal cases.

p.2
Recombinant DNA Techniques

What are oligonucleotides used for in gene studies?

As primers for DNA synthesis or as probes for detecting DNA or RNA sequences.

p.1
Viral Infections and Treatment

How do interferons act in response to viral infections?

Interferons reduce protein synthesis by phosphorylating eIF-2, which inhibits the initiation of protein synthesis.

p.4
DNA Sequencing Methods

What is the role of dideoxynucleotides (ddNTPs) in DNA sequencing?

They terminate the polymerization of the DNA chain when incorporated.

p.4
DNA Sequencing Methods

What technique is used to visualize DNA fragments after sequencing?

Polyacrylamide gel electrophoresis.

p.8
Proteomics and Protein Analysis

What techniques are commonly used in proteomics?

Two-dimensional gel electrophoresis and mass spectrometry for identifying protein fragments.

p.8
Microarray Technology in Diagnostics

What is the purpose of microarrays?

To screen thousands of genes simultaneously to determine allele presence or compare RNA expression patterns.

p.4
DNA Sequencing Methods

What is the outcome when a normal nucleotide is incorporated instead of a dideoxynucleotide?

The DNA chain continues to grow until another ddNTP is encountered.

p.4
Proteomics and Protein Analysis

What is a Western blot?

A technique for separating proteins by gel electrophoresis and probing with antibodies.

p.2
Restriction Enzymes and DNA Fragmentation

What are restriction enzymes used for?

To cleave DNA within short, specific sequences for study or insertion into other DNA.

p.6
Restriction Enzymes and DNA Fragmentation

What are variable number tandem repeats (VNTR)?

Regions in normal human DNA that contain a highly variable number of repeats, differing among individuals and alleles.

p.3
DNA Sequencing Methods

How does DNA migrate in gel electrophoresis?

DNA migrates toward the positive electrode due to its negatively charged phosphate groups.

p.6
Restriction Enzymes and DNA Fragmentation

What is the significance of the Mst II site in sickle cell anemia?

The mutation causing sickle cell anemia results in the loss of the Mst II site in the β-globin gene, affecting restriction fragment patterns.

p.2
Gene Therapy Applications

What is gene therapy?

A technique that uses recombinant DNA to treat diseases.

p.3
DNA Sequencing Methods

What is the main difference between Southern and Northern blots?

Southern blots involve DNA, while Northern blots involve RNA, and alkali is not used in Northern blots.

p.4
DNA Sequencing Methods

What is the purpose of using a radioactive label in DNA sequencing?

To visualize the bands on the gel by autoradiography.

p.4
DNA Sequencing Methods

What is the purpose of using automated DNA sequencers?

To analyze the fluorescence of labeled ddNTPs and determine the base that terminated synthesis.

p.7
Gene Therapy Applications

What is the purpose of oligonucleotide probes in testing for cystic fibrosis (CF)?

To identify the presence of a 3-base deletion in the CF gene.

p.2
Recombinant DNA Techniques

What is the product of combining DNA fragments from different sources called?

Chimeric or recombinant DNA.

p.7
Gene Therapy Applications

What is the significance of the ∆F508 probe in cystic fibrosis testing?

It specifically binds to the mutant allele associated with cystic fibrosis.

p.3
DNA Sequencing Methods

What techniques can be used to visualize DNA bands in a gel?

Staining with dyes like ethidium bromide and autoradiography.

p.3
DNA Sequencing Methods

What is a Southern blot?

A technique where a radioactive DNA probe hybridizes with DNA on a nitrocellulose blot of a gel.

p.5
DNA Sequencing Methods

In which direction does DNA synthesis occur?

From 5' to 3'.

p.3
DNA Sequencing Methods

What is a Western blot?

A technique that involves electrophoresis of proteins visualized by binding to antibodies.

p.5
Restriction Enzymes and DNA Fragmentation

What is Restriction Fragment Length Polymorphism (RFLP)?

A mutation that occurs in a restriction enzyme cleavage site, affecting DNA cleavage.

p.2
DNA Sequencing Methods

How does gel electrophoresis function?

It separates DNA fragments by size.

p.6
Gene Therapy Applications

What is the purpose of allele-specific oligonucleotide probes?

To detect mutations by binding to complementary DNA regions, indicating the presence of mutant or normal alleles.

p.8
Gene Therapy Applications

What is required for analyzing single-base changes in DNA samples?

Stringent hybridization conditions, specifically high temperature and low salt.

p.1
Ferritin Synthesis Regulation

What is the role of IRE-BP in ferritin synthesis regulation?

IRE-BP binds to the iron response element (IRE) when it does not contain bound iron, preventing translation of ferritin mRNA.

p.8
Gene Therapy Applications

What is gene knockout?

The removal or disruption of genes to develop animal strains that lack the protein product of the gene.

p.1
Viral Infections and Treatment

What is the mechanism of action of HIV protease inhibitors?

They prevent the protease from cleaving a polyprotein into structural proteins and enzymes needed for viral assembly.

p.5
Polymerase Chain Reaction (PCR)

What is required as starting material for PCR?

Only a very small sample of DNA.

p.9
Proteomics and Protein Analysis

How can differences in protein expression be visualized?

By overlaying fluorescent images obtained from different wavelengths of light.

p.3
DNA Sequencing Methods

What is the purpose of gel electrophoresis?

To separate DNA chains of varying lengths.

p.6
Restriction Enzymes and DNA Fragmentation

What are the expected restriction fragment sizes for sickle cell and normal alleles?

Sickle cell allele produces a 1.3 kb fragment, while the normal allele produces a 1.1 kb fragment.

p.8
Gene Therapy Applications

What has the Human Genome Project achieved?

Sequencing the human genome, identifying markers like SNPs, and identifying approximately 25,000 genes.

p.8
Gene Therapy Applications

What is the focus of current research in gene therapy?

Preventing immune rejection and promoting long-term expression of transgenes.

p.6
Restriction Enzymes and DNA Fragmentation

What is the effect of a mutation on restriction fragments in DNA?

A mutation can create or eliminate a restriction site, resulting in different sizes of restriction fragments.

p.3
DNA Sequencing Methods

What is a probe in the context of DNA sequencing?

A single strand of DNA that can hybridize with a complementary sequence on another single-stranded polynucleotide composed of DNA or RNA.

p.9
Gene Therapy Applications

What genetic factor is associated with an increased risk of Alzheimer's disease?

The E4 allele of the apolipoprotein E (apoE) gene.

p.9
Viral Infections and Treatment

What is the initial screening assay for HIV testing?

Enzyme-linked immunosorbent assay (ELISA).

p.9
Gene Therapy Applications

What is the significance of the three apoE alleles (E2, E3, E4)?

They differ by one base and affect the risk of developing Alzheimer's disease.

p.5
DNA Sequencing Methods

How can the sequence of a growing DNA chain be read?

From the bottom to the top of the gel, in the 5' to 3' direction.

p.8
Microarray Technology in Diagnostics

How do microarrays aid in diagnosing infectious diseases?

By using patient RNA converted to cDNA to bind to oligonucleotides on a chip that correspond to various pathogens.

p.9
Proteomics and Protein Analysis

What fluorescent dyes are used to label protein extracts in the described method?

Cy3 and Cy5.

p.3
DNA Sequencing Methods

What types of labels can be used on probes?

Radioactive labels for autoradiography or chemical labels that can be identified by fluorescence.

p.2
Gene Therapy Applications

What is the purpose of producing cDNA from mRNA?

To create a DNA copy that does not contain introns or the promoter region.

p.4
DNA Sequencing Methods

How does the Sanger method determine the sequence of DNA?

By incorporating dideoxynucleotides that terminate synthesis at specific bases.

p.1
Recombinant DNA Techniques

What is the significance of newly developed techniques in molecular biology?

They are used for research, medical diagnosis, and production of therapeutic proteins, offering hope for treating currently incurable diseases.

p.5
Gene Therapy Applications

What are polymorphisms in genetics?

Variations in DNA sequences that occur frequently in the genome.

p.5
Polymerase Chain Reaction (PCR)

What happens during the heating and cooling cycles in PCR?

Strands separate, primers are added, and heat-stable DNA polymerase synthesizes new DNA.

p.9
Gene Therapy Applications

What do SNPs help assess in individuals?

The risk of acquiring or being susceptible to certain diseases.

p.5
Recombinant DNA Techniques

What can be obtained from the expression of cloned foreign DNA?

Large quantities of its protein product.

p.8
Gene Therapy Applications

What role does biotechnology play in disease diagnosis?

It is used to produce probes for screening human samples and generating proteins for therapy or vaccines.

Study Smarter, Not Harder
Study Smarter, Not Harder