Manipulating genomes Flashcards

1
Q

What is the human genome?

A

All the genetic material of an organism

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2
Q

What is the genome for eukaryotes?

A

All the DNA in the nucleus and the mitochondria combined

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3
Q

What is an exon?

A

The regions of DNA that codes for proteins, only 2% of your total DNA

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4
Q

What is an intron?

A

Non-coding regions of DNA removed from mRNA before translation

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5
Q

What is satellite DNA?

A

Short sequences of DNA that are repeated many times, can be microsatellites (smaller sections)

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6
Q

What is DNA profiling?

A

Producing an image of the patterns in the DNA

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7
Q

The uses of DNA profiling?

A

Paternity tests, criminal investigations, and identifying individuals at risk of developinga genetic disease

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8
Q

Stages of DNA profiling?

A

Extraction, digestion, separation, hybridization and development

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9
Q

Explain the extraction stage of DNA profiling?

A

The Polymerase Chain Reaction (PCR) is used to extract DNA from a tissue sample

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10
Q

The other name for restrictive enzymes?

A

Restriction endonucleases

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11
Q

Explain digestion stage in DNA profiling?

A

Strands cut into small fragments using restrictive enzymes, make 2 cuts through each strand of double helix

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12
Q

Explain the separation stage of DNA profiling?

A

The cut fragments undergo electrophoresis

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13
Q

Explain the process of electrophoresis?

A

Charged particles move through gel medium under electric current, the gel is immersed in alkali to separate double strands into single strands, transferred onto a membrane by Southern blotting

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14
Q

What is hybridization?

A

Fluorescent DNA probes added to excess fragments, bind to complementary strands under particular conditions

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14
Q

3 stages of the PCR?

A

Denaturing, Annealing and Extraction

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15
Q

Which enzyme is used in the extraction of the PCR?

A

Taq polymerase - can withstand high temps, obtained from a bacteria in hot springs

15
Q

Examples of where DNA traces can be obtained from?

A

Hair, blood, semen, saliva and skin cells

15
Q

Explain what happens at each stage of the PCR?

A

Denaturing - High temps (90-95) DNA denatures, hydrogen bonds broken, strands separate
Annealing - Temp decrease (55-60) primers bind (anneal) to ends of DNA strands
Extraction - Temp increase (72-75), DNA polymerase builds complementary strands from free nucleotides, Taq polymerase is used

16
Q

What technique is used for DNA sequencing?

A

The Sanger sequencing technique

17
Q

What do the terminator bases do?

A

Modified fluorescent versions of the four nucleotide bases that stops the DNA synthesis

17
Q

Explain the Sanger sequence technique?

A

The DNA is mixed with DNA polymerase, terminator and normal nucleotides, placed in a thermal cycler, DNA adds complementary bases, every time terminator base picked up sequencing stops, sequencing restarts, different length sequences undergo electrophoresis, data fed into a computer

17
Q

What is bioinformatics?

A

The development of the software and computing tools needed to organize and analyze biological data

18
Q

What is computational biology?

A

Data that is used to build theoretical models of biological systems that can be used to predict different circumstances

19
Q

Examples of synthetic biology?

A

Genetic engineering, immobilized enzymes, synthesis of new genes, artificial genomes

19
Q

What is synthetic biology?

A

Emerging area of research described as construction of artificial biological pathways, organisms or devices, redesigning natural biological systems

19
Q

What is DNA barcoding?

A

Identifying particular sections of the genome that are common to all species but very between them