Principles of biotechnology Questions in English

(A) The statement is True. Ori stands for the Origin of replication. It is a specific $DNA$ sequence in a genome at which replication is initiated. Any piece of $DNA$ linked to this sequence can be made to replicate within the host cells.

(C) Genetic engineering is the branch of biotechnology that involves the direct manipulation of an organism's genes using biotechnology to alter its characteristics.
It involves the isolation,modification,and reintroduction of $DNA$ into cells to produce recombinant $DNA$ molecules,which can then be used to create genetically modified organisms.

(A) Modern biotechnology is primarily based on two core techniques:
$(i)$ Genetic engineering: This involves techniques to alter the chemistry of genetic material ($DNA$ and $RNA$),to introduce these into host organisms,and thus change the phenotype of the host organism.
$(ii)$ Bioprocess (Biochemical) engineering: This involves the maintenance of sterile conditions in chemical engineering processes to enable the growth of only the desired microbe or eukaryotic cell in large quantities for the manufacture of biotechnological products like antibiotics,vaccines,and enzymes.

(B) Stanley Cohen and Herbert Boyer are credited with the construction of the first recombinant $DNA$ molecule in $1972$.
They accomplished this by isolating the antibiotic resistance gene by cutting out a piece of $DNA$ from a plasmid which was responsible for conferring antibiotic resistance.

(D) The European Federation of Biotechnology $(EFB)$ has defined biotechnology in a way that encompasses both traditional and modern molecular biotechnology.
According to the $EFB$,biotechnology is the integration of natural science and organisms,cells,parts thereof,and molecular analogues for products and services.
This definition is widely accepted as it covers the entire spectrum of biological applications.

(C) Biotechnology is a field that integrates natural sciences and engineering to achieve the application of organisms,cells,parts thereof,and molecular analogues for products and services.
It primarily encompasses the industrial-scale production of biopharmaceuticals and biological products.
Additionally,it involves the use of genetically modified microbes,fungi,plants,and animals for various beneficial purposes.
Therefore,both statements $(A)$ and $(B)$ are correct.

(B) There are three critical research areas of biotechnology:
$(i)$ Providing the best catalyst as an improved organism,usually a microbe or pure enzyme.
$(ii)$ Creating optimal conditions through engineering for a catalyst to act.
$(iii)$ Downstream processing technologies to purify the proteins or organic compounds.
Multiple Ovulation Embryo Transfer Technology $(MOET)$ is a method for herd improvement in cattle,but it is not classified as one of the three core research areas of biotechnology. Therefore,statements $I$,$II$,and $III$ are correct.

(B) The term $In$ $vitro$ is derived from Latin,meaning 'in glass'.
It refers to biological processes or experiments performed outside the living organism,typically in a controlled laboratory environment such as a test tube,culture dish,or petri dish.
In contrast,$In$ $vivo$ refers to processes occurring within a living organism.

(C) The European Federation of Biotechnology $(EFB)$ has defined biotechnology as:
"The integration of natural science and organisms,cells,parts thereof,and molecular analogues for products and services."
This definition encompasses both traditional and modern biotechnology.

(A) Modern biotechnology is primarily based on two core techniques:
$1$. Genetic Engineering: Techniques to alter the chemistry of genetic material ($DNA$ and $RNA$) to introduce these into host organisms and thus change the phenotype of the host organism.
$2$. Bioprocess Engineering: Maintenance of sterile ambience in chemical engineering processes to enable growth of only the desired microbe/eukaryotic cell in large quantities for the manufacture of biotechnological products like antibiotics,vaccines,and enzymes.
Therefore,$II$ (Genetic Engineering) and $III$ (Bioprocess Engineering) are the techniques that gave birth to modern biotechnology.

(D) Genetic engineering is the technique that involves the manipulation of genetic material ($DNA$ or $RNA$) to introduce it into host organisms.
By altering the chemistry of the genetic material,scientists can change the phenotype of the host organism,allowing it to express desired traits.
$PCR$ (Polymerase Chain Reaction) is used for amplification of $DNA$.
Bioprocess engineering involves the maintenance of sterile conditions for the growth of desired microbes or eukaryotic cells.
Electrophoresis is a technique used for the separation of $DNA$ fragments based on their size.

(B) Traditional hybridization involves the crossing of two organisms,which often leads to the inclusion of both desired and undesired genes in the progeny. In contrast,recombinant $DNA$ technology (also known as genetic engineering) allows for the precise selection and insertion of only the desired genes into the host organism,thereby avoiding the inclusion of undesired traits.

(A) The origin of replication $(ori)$ is a specific $DNA$ sequence in a chromosome or plasmid where $DNA$ replication is initiated.
It is the sequence responsible for controlling the copy number of the linked $DNA$.
If one wants to recover many copies of the target $DNA$,it should be cloned in a vector whose origin supports high copy number.

(C) Biotechnology primarily deals with the use of living organisms or their components to produce products and processes useful to humans. The three main research areas of biotechnology are:
$1$. Providing the best catalyst in the form of improved organisms,usually microbes or pure enzymes.
$2$. Creating optimal conditions through engineering for the catalyst to act.
$3$. Downstream processing technologies to purify the protein/organic compound.
Traditional hybridization (option $C$) is a conventional breeding method and is not considered a core research area of modern biotechnology.

(B) The correct answer is option $(B)$ ($B$ and $C$ only).
When a piece of $DNA$ carrying only the gene of interest is transferred into an alien organism,it lacks the origin of replication $(ori)$ required for independent replication.
Therefore,the following outcomes are possible:
$(B)$ It may get integrated into the genome of the recipient organism.
$(C)$ Once integrated,it may multiply and be inherited along with the host $DNA$ during cell division.
It cannot multiply independently (as stated in $A$ and $E$) because it lacks the necessary sequences for autonomous replication.

(A) The $Ori$ (Origin of replication) is a specific $DNA$ sequence in a plasmid where replication is initiated.
It is responsible for controlling the copy number of the linked $DNA$.
If a piece of foreign $DNA$ is linked to this sequence,it can replicate and multiply itself in the host organism.
Therefore,the $Ori$ sequence determines the number of copies of the plasmid (and the linked $DNA$) within the host cell.

(C) Genetic engineering is defined as the technique of altering the chemistry of genetic material ($DNA$ and $RNA$) to introduce these into host organisms and thus change the phenotype of the host organism. This process involves the manipulation of genetic material in an "in-vitro" environment to achieve a desired outcome. Therefore, the correct answer is genetic engineering.