DNA Tech: 44 MCQs with answers

Polymorphisms in non-coding repetitive DNA sequences

DNA fingerprinting relies on variable number tandem repeats (VNTRs) or short tandem repeats (STRs) in non-coding regions, which show high polymorphism among individuals.

Polymerase chain reaction (PCR)

PCR is used to amplify specific DNA regions, such as STR loci, to obtain sufficient DNA for analysis.

To map and sequence the entire human genome

The HGP aimed to determine the complete sequence of the human genome and identify all its genes.

False

DNA fingerprinting focuses on specific highly variable regions, not the entire genome.

To identify individuals based on their DNA

DNA fingerprinting is primarily used to identify individuals based on their unique DNA profiles.

An international research effort to map all human genes

The Human Genome Project was an international research effort aimed at mapping all human genes.

Short Tandem Repeats

STR stands for Short Tandem Repeats, which are repeating sequences of DNA used in fingerprinting.

To identify all the genes in the human genome

The main purpose of the Human Genome Project was to identify all the genes in the human genome.

Polymerase Chain Reaction (PCR)

Polymerase Chain Reaction (PCR) is commonly used to amplify DNA samples for fingerprinting.

It can be done using small DNA samples

DNA fingerprinting can be performed using small DNA samples, making it versatile in various applications.

They help in distinguishing between individuals

STRs are highly variable among individuals, making them useful for distinguishing between different DNA profiles.

The complete sequence of human DNA

The Human Genome Project provides the complete sequence of human DNA, which is essential for understanding genetics.

The samples are from the same individual

A match between two DNA samples indicates that they are likely from the same individual due to identical DNA profiles.

DNA

DNA fingerprinting primarily analyzes the unique sequences of an individual's DNA.

Short tandem repeats (STRs)

Short tandem repeats (STRs) are specific regions of DNA that are highly variable among individuals, making them useful for fingerprinting.

The human genome

The Human Genome Project aimed to map and understand all the genes of the human genome.

To amplify DNA

DNA polymerase is used to amplify DNA, allowing for sufficient material to analyze in fingerprinting.

The complete set of DNA in an organism

The term 'genome' refers to the complete set of DNA, including all of its genes, in an organism.

2003

The Human Genome Project was officially completed in 2003, marking a significant milestone in genetics.

To identify individuals involved in a crime

DNA fingerprinting is primarily used in forensic science to identify individuals involved in a crime by comparing DNA samples.

Sanger sequencing

Sanger sequencing is a method used for determining the sequence of DNA and was essential in the Human Genome Project.

To understand genetic diseases

Identifying genetic variations helps in understanding genetic diseases and their mechanisms.

To compare DNA samples for identification

The primary purpose of DNA fingerprinting is to compare DNA samples to identify individuals based on their unique genetic profiles.

Forensic identification

DNA fingerprinting is widely used in forensics to match biological samples to individuals.

2003

The HGP was declared complete in April 2003, although a draft was published in 2001.

Repetitive DNA sequences of 2-7 base pairs

STRs are microsatellites with repeat units of 2-7 base pairs, highly variable among individuals.

Translation of DNA into protein

DNA fingerprinting does not involve translation; it analyzes DNA fragments directly.

It provides a reference for identifying disease-associated genes

The HGP provides a reference sequence that helps researchers identify genes linked to diseases.

NIH and DOE

The HGP was coordinated by the U.S. National Institutes of Health (NIH) and Department of Energy (DOE).

True

The HGP has facilitated the identification of numerous genes linked to various diseases.

DNA fingerprinting utilizes genetic variations to distinguish individuals.

The correct option is true because DNA fingerprinting relies on genetic variations, such as short tandem repeats (STRs), to differentiate between individuals.

By providing a complete map of the human genome, it allows for tailored treatments based on genetic makeup.

The correct option is true because the Human Genome Project provides insights into individual genetic variations, allowing for personalized treatment strategies.

Polymerase Chain Reaction (PCR)

The correct option is true because PCR is widely used to amplify specific DNA sequences for further analysis in DNA fingerprinting.

SNPs can help in understanding genetic predispositions to diseases.

The correct option is true because SNPs represent common genetic variations that can influence disease susceptibility and treatment responses.

Bioinformatics analyzes and interprets the vast amounts of data generated.

The correct option is true because bioinformatics plays a crucial role in managing and analyzing the extensive data produced by genome sequencing.

STRs provide a unique pattern of repeats that varies significantly among individuals.

The correct option is true because STRs vary in number among individuals, creating distinct patterns that enhance identification accuracy.

DNA fingerprinting focuses on individual identification, while the HGP aims to map the entire human genome.

The correct option is true because DNA fingerprinting is used for individual identification, whereas the HGP focuses on sequencing and mapping the entire human genome.

The potential for genetic discrimination based on genetic information.

The correct option is true because the information obtained from the HGP could lead to discrimination in employment or insurance based on an individual's genetic predispositions.

A variant form of a gene that can exist at a specific locus.

The correct option is true because an allele is a specific variant of a gene found at a particular location on a chromosome, which is crucial for DNA fingerprinting.

By providing a reference sequence for comparison in genetic studies.

The correct option is true because the reference sequence generated by the HGP serves as a foundation for ongoing research into genetic variations and their implications.

The samples come from the same individual

A match in multiple STR loci indicates that the DNA samples likely originate from the same individual.

Less than 2%

Only a small fraction (less than 2%) of the human genome consists of protein-coding sequences.

It can be affected by sample degradation

Degraded DNA can lead to incomplete or unreliable profiles, limiting the technique's effectiveness.

They cut DNA at specific sequences

Restriction enzymes cleave DNA at specific recognition sites, producing fragments for analysis.