Lecture 1 Flashcards Preview

Molecular Biotechnology > Lecture 1 > Flashcards

Flashcards in Lecture 1 Deck (25):

Define biotechnology

Application of scientific and engineering principles to the processing of materials by biological agents to provide goods and services


What is fermentation?

The chemical transformation of organic components with aid of enzymes, especially microbial


Five types of antique fermentation still around

Wine production – religious texts; Spirit production – 800BC china distillation of sake, EU distillation by 11/12th century, d. fermented grain global 14th cent. AD; Breadmaking – 6000BC Sumerians Babylonians make beer, 4000BC Egyptions brewers least leaven bread; Vinegar and yoghurt – acetic acid and lactic acid fermentation; Cheese and fermented milk products – bacterial and fungal mould


When was the existence of microbes first recognised and by whom?

In 17th cen. 1676 by dutch microscopist Antonie van Leeuwenhoesk, described ‘animalcules’ = bacteria in microscope , sig as fermentation requires microbes


Who showed that microbes could NOT arise spontaneously from nothing and when?

Louis PASTEUR and John TYNDALL in the 1860s


What else did PASTEUR discover?

Each type of fermentation mediated by specific microbe, possible for microbes to be anaerobic


What scientists were primarily involved in the start of biotechnology as a science?

Antonie van Leeuwenhoesk 1676 animalcules; PASTEUR and TYNDALL 1860s non spontaneous microbes; KOCH grew bacteria in lab pure culture; PASTEUR fermentation by specific microbe, strictly anaerobic; BUCHNER 1897 cell-free metabolism -> enzymes


How and who discovered enzymes?

Edward BUCHNER 1897 –filtered extract of macerated yeast ‘zymase’ = retained the ability to convert sugar into alcohol later show conversion result of serious chem reaction by spec enzymes. Demonstrated ‘no vital force’, enzyme activites can be purified and worked on in vitro


How is Karly Ereky attributed with the development of the modern biotechnology process?

Coined the term ‘biotechnology’ 1917 process farm pigs w/ sugar beet as food staple
Sugar beet (raw material) -> prepare foodstuff (upstream processing) -> feed pigs (biotransformation) -> slaughter pigs (downstream processing) -> sell pork (pure product)


How did EREKY define biotechnology?

All lines of work by which products are produced from raw materials by living things


How was the production of antibiotics optimised to increase yield (progress in 1940s – 70s)

Improved strains of bacteria/fungi used; improved growth conditions ‘submerged culture’ fermentation; mutation and selection to increase yields from microbes


What features of microbes make them useful for biotechnology?

Small size and high surface area ratio (facilitate rapid nutrient transport); high metabolic rate; adaption to broad range of environments, diff metabolic processes; grow well on low grade inexpensive + sometimes toxic materials


How did COHEN and BOYER develop recombinant DNA technology + what was their experiment?

Met @ conference and combined research ideas – COHEN transferring plasmids between bacteria, BOYER enzyme cut DNA @ specific sites (restriction endonuclease)
1873 cut up plasmid with restriction enzyme + spliced in foreign DNA + transferred products to E.coli


Who developed dideoxy sequencing and what is it used for?

Dideoxy sequencing = chain termination method, used in 1980s by Fred SANGER to sequence small regions of DNA


What was the first full genome to be sequenced and what and who and when?

Haemophilus influenzae 1.8Mb genome by Craig VENTER + al 1995 by chain termination method
Published E.coli in 1996


What other model organisms have been sequenced and when?

Budding yeast (Saccharomyces ceravisae 1996); Arabidopsis thaliana 2000; Human 2001


Advantage of development of sequencing methods and 2nd and 3rd gen methods?

Allow sequencing of billions of bp at low cost


Who was PCR developed by, when, and what for?

1988 by Kery MULLIS, allowed rapid amplification of DNA pieces for cloning – combined with knowledge of genome sequence allowed genes to be easily clones and manipulated


How have genetic methods been improved in microbes such as yeast?

Though the use of viral vectors to intoduced cloned recombinant genes for expression


When were Ti (tumour inducing plasmids from certain bacteria) plasmids first utilised and how?

In 1983, to transform plant cells with recombinant plasmids


How can Site Directed Mutagenesis improve properties of recombinant proteins?

SDM means that it is easy to design and create mutated copies of a gene to allow for specific changes in protein sequence


What does in silico mean?

simulated on a computer


What is the benefit of allowing whole cell modelling of metabolism in silico?

allows microbiologists to predict how to manipulate important bacterial properties for biotechnology uses


What are two advantages of gene synthesis compared to the use of PCR?

1) Allows for codon optimisation
2) Can make changes to a sequence, e.g. add a restriction site OR make a specific mutation


When was the first whole genome synthesised and by whom?

by craig VENTER et al. 1.08Mb Mycoplasma mycoides genome from oligo nucleotides -> used to replace host genome for a particular Mycoplasma species