Generate Quiz 6A2A2C852FE5A

Adenosine Deaminase (ADA) deficiency causes “SCID,” so it is used to treat the condition. Option A is therefore the right choice. Digestion is aided by pancreatic enzymes (B). In some organisms, beta-galactosidase (C) converts lactose to galactose and glucose. Bacteria produce an enzyme called beta-lactamase (D), which breaks down the beta-lactam ring found in beta-lactam medications like penicillin, giving them resistance to these medications.

A defective or disease-causing gene can be replaced with a normal, healthy gene through the genetic engineering process known as gene therapy. In 1990, a 4-year-old girl with adenosine deaminase (ADA) deficiency received the first clinical gene therapy. The immune system depends on this enzyme to function, and a lack of it can result in severe combined immune deficiency (SCID).

This technique is predicated on partial chemical modification of DNA specific to nucleobases, followed by cleavage of the DNA backbone at locations next to the altered nucleotides.

This choice is accurate since transgenic organisms do entail the insertion of foreign genes, can contribute to the creation of pharmaceuticals, and have advantages that can be seen in a number of applications.

The polymerase chain reaction (PCR) uses Taq polymerase, a heat-stable DNA polymerase, to amplify DNA. Thermus aquaticus, a bacterium that lives in hot springs and other hot environments, is where it was first isolated. Taq polymerase is a useful tool for molecular biology because it can tolerate the high temperatures needed for the denaturation of double-stranded DNA during PCR.

Bacteria contain a class of enzymes called restriction endonucleases. They are known as endonucleases because they target bacteriophage viruses, which are viruses that attack bacteria, and they cut the viral genome from within the strand rather than across. Because they limit the activity of viruses or the likelihood of a viral infection, they are known as restriction enzymes.

Cutting is a popular commercial technique for plant propagation that yields millions of seedlings in a short period of time.

The techniques used to determine a gene’s locus and the separations between genes are referred to as gene mapping. The distances between various locations within a gene can also be described by gene mapping. Placing a set of molecular markers onto the appropriate locations on the genome is the fundamental component of all genome mapping.

The hybrid DNA created by joining two or more DNA molecules is known as recombinant DNA. Therefore, choice B is the right one.

DNA amplification can be carried out in research or diagnosis using techniques like polymerase chain reaction, which is a simple, affordable, and dependable method of repeatedly replicating a specific DNA segment by polymerizing nucleotides. This idea is applicable to many areas of contemporary biology and related sciences.

In DNA recombinant technology, plasmids—small, circular, double-stranded DNA molecules—are modified and subsequently introduced into cells.

Microinjection: This is the right response. One method frequently employed in transgenic animal research is microinjection. This method involves directly injecting a desired gene into the nucleus of a developing embryo or the pronucleus of a fertilized egg. The desired gene is expressed in the animal’s progeny as a result of the injected gene becoming integrated into the animal’s genome.

This is the right response. Escherichia coli (E. coli) is the source of the type II restriction enzyme EcoR1. It cleaves the DNA at the precise location after identifying a particular DNA sequence. It facilitates the insertion of foreign DNA into plasmid vectors by creating DNA fragments with cohesive (sticky) ends.

This is the right response. In order to produce a distinct “fingerprint” or pattern, DNA fingerprinting entails the molecular examination of particular DNA regions. It is frequently employed for forensic identification, paternity testing, and other purposes.

CaCl2: This is the right response. A procedure known as “calcium chloride transformation” involves treating bacterial cells with a calcium chloride (CaCl2) solution to improve their capacity to absorb recombinant plasmids. By temporarily perforating the bacterial cell membrane, the CaCl2 treatment facilitates the plasmids’ entry into the cells.

A vector in molecular cloning is a DNA molecule that is used to artificially transfer foreign genetic material into a different cell so that it can be expressed and/or replicated. Recombinant DNA is a vector that contains foreign DNA. Since the vector should be small in order to facilitate easy integration into the host cell, it is appropriate to incorporate it with the large external DNA fragment. It ought to be able to insert a sizable DNA segment. It ought to have several cloning sites.

By permitting the DNA to replicate with host DNA, the number of recombinant DNA copies can be increased.

Restriction enzymes, also known as restriction endonucleases, cut double-stranded DNA at a specific location after identifying a particular nucleotide sequence.

Reverse transcriptase’s general function is to change RNA sequences into cDNA sequences that can be inserted into various genomic locations.

SCID, a collection of uncommon, hereditary diseases marked by a significant impairment of the immune system’s T and B cells, is caused by ADA deficiency. Purines are broken down by adenosine deaminase, and when this enzyme is lacking, toxic metabolites that are especially detrimental to immature immune cells build up.

Certain genes can be separated using restriction enzymes, which are used to separate DNA molecules at particular locations.

recall of facts;

The antibiotic resistance genes ‘bla’, which codes for the ampicillin resistance (AmpR) protein, and ‘tetA’, which codes for the tetracycline resistance (TetR) protein, are found in pBR322, which is base pairs long.

There are no genetically engineered vaccines for “HCV” (hepatitis C virus). Its high genetic variability and the dearth of small animal models for vaccine testing are the causes.

When an organism undergoes mitosis or budding and produces identical offspring, this is known as asexual reproduction.

Anti-tetanus serum can be used to treat tetanus, a bactenal infection. Passive immunity can happen naturally, like when a baby gets a mother’s antibodies through breast milk or the placenta, or artificially, like when someone gets an injection of antibodies (gamma globulin injection).

The two DNA strands are separated in a polymerase chain reaction (PCR) by increasing the temperature. Denaturation is the process of heating DNA to separate its strands. It makes the DNA single-stranded and ready for subsequent PCR steps.

PCR does not require the presence of ribonucleotides. Instead of using ribonucleotides, PCR uses deoxyribonucleotide triphosphates (dATP, dCTP, dGTP, and dTTP) to synthesize DNA.

Recombinant DNA is created when a fragment of the host’s DNA is separated and inserted into a piece of the source DNA to create a combined DNA.

DNA bands can be found using fluorescent dyes, sometimes referred to as reactive dyes or fluorophores. By using the molecule’s inherent fluorescence or by attaching it with a fluorophore, fluorescence is used in biology as a non-destructive method of analyzing biological molecules, even at low concentrations. As a result, DNA bands are easily visible.

The transgenic rice (Oryza sativa) known as “golden rice” has high levels of B-carotene, which is the provitamin A-inactive form of vitamin A. The main source of vitamin A is beta-carotene. This rice is known as golden rice because of the B-carotene that gives its grains their yellow hue.

Liposome-based gene therapy is used to treat cystic fibrosis. Liposomes are tiny lipoprotein vesicles that are used to transfer the healthy gene into the patient’s cells.

It is employed to create millions of copies of a single DNA molecule or a small number of them. The target DNA sequence is extremely specific; it may make up less than one part in a million of the entire DNA sample.

This is the right response. In order to protect against pests like nematodes, DNA that produces toxic proteins has been introduced into a number of genetically modified plants, including some tobacco plants. These proteins may be poisonous to pests, giving the plant resistance.

The DNA synthesis enzyme taq polymerase is most active between 70 and 80 degrees Celsius, though it can also work close to 100 degrees.

Drug-carrying liposomes contain polysaccharide sacs and water in the center.

A gene probe is a brief sequence of DNA or RNA that complements a particular target sequence. Radioactive nucleotides are among the markers that can be applied to gene probes. When the gene probe binds to its complementary target sequence, the radioactively labeled nucleotides enable its detection and visualization.

Bacteria produce a protein known as restriction enzyme, or restriction endonuclease, which cleaves DNA at particular locations along the molecule. By cleaving foreign DNA within the bacterial cell, restriction enzymes eradicate infecting organisms. There are specific endonucleases that cleave particular locations within a DNA sequence; these are also known as restriction endonucleases.

In a criminal investigation, a laboratory technique called DNA fingerprinting is used to connect biological evidence to a suspect. A suspect’s DNA sample and a sample collected from a crime scene are compared and examined. The evidence originated from that suspect if the two DNA profiles match.

Gene therapy may make it possible to treat or completely eradicate physical conditions or inherited diseases brought on by these mutations. The manipulation of genes to combat or prevent diseases is known as gene therapy.

EcorI is not a vector for cloning. This restriction enzyme splits double-stranded DNA into complementary single-stranded strands.

The absence of Cl-protein channels causes a reduction in the flow of chloride ions and water out of cells, resulting in thicker mucus in cystic fibrosis.

Because modified Lambda phages are effective at packing and injecting DNA into cells, they are used as a vector to introduce foreign DNA into cells.

Plasmids have been exploited by scientists as instruments for gene manipulation, transfer, and cloning. Thus, each of these is accurate.

One lab technique for sorting DNA, RNA, or protein mixtures based on molecular size is gel electrophoresis. An electrical field forces the molecules to be separated through a gel with tiny pores in gel electrophoresis.

The right response is that the nucleotide base pairs are similar. Uracil is an RNA nucleotide that has nothing to do with DNA.Deoxyribose sugar has the same structure everywhere.

Bone marrow stem cells are extracted from the patient as part of gene therapy for SCID. A retrovirus that introduces the normal gene into the cells is injected into these cells. After being given back to the patient, the stem cells begin to produce the required enzyme.

In the vicinity of or at recognition sites, restriction endonucleases split into fragments. Bacteria have them as a defense mechanism against viruses.

Gene transfer between organisms is now feasible thanks to recombinant DNA (rDNA) technology.

The hormone insulin controls blood sugar levels and is necessary for the breakdown of carbohydrates. The right choice is recombinant DNA technology since it was first successfully applied to the production of human insulin (d). In 1978, this was completed.

It is possible to vaccinate against bacterial and viral illnesses. It is possible to efficiently prime the immune system to identify and combat both kinds of pathogens.

In a criminal investigation, a laboratory technique called DNA fingerprinting is used to connect biological evidence to a suspect. A suspect’s DNA sample and a sample collected from a crime scene are compared. Paternity can also be established through DNA fingerprinting. A DNA fingerprint is depicted in the figure below:

The artificial process of growing plants vegetatively using tissue culture or cell culture methods is known as micropropagation. Asexual reproduction or vegetative propagation are the two methods used to create plants in vitro in this artificial propagation process.

In the commercial production of a human cell, a human gene is introduced into the DNA of a bacterium, which grows in a suitable environment and produces insulin that humans can use.

A laboratory technique called DNA fingerprinting uses the nucleotide sequences of specific, individual-specific regions of human DNA to infer a person’s likely identity. Gene therapy is unrelated to DNA fingerprinting.

Covalent phosphodiester bonds, which bind the nucleotides together permanently, are created by the DNA ligase. If the vector is cut by a different restriction enzyme, ligation will take place because the insert DNA is physically joined to the backbone after ligation, and the entire plasmid can be converted into bacterial cells for propagation.

DNA fingerprinting uses genetic marker probes to find markers like microsatellites, which result in unique patterns on X-ray and autoradiography films.

Combining DNA molecules from two distinct species is known as recombinant DNA technology. In order to create novel genetic combinations useful for industry, agriculture, science, and medicine, the recombinant DNA molecule is introduced into a host organism.

DNA recombinant technology depends on enzymes, which aid in the necessary modification and alteration of DNA molecules.

Tqa polymerase was found to be an enzyme capable of withstanding the protein-denaturing conditions, such as the high temperature needed for PCR, and Thermus aquaticus is a bacterium that inhabits hot springs and hydrothermal vents. Consequently, the DNA polymerase used in the PCR technique comes from this source.

One method for separating DNA fragments based on size and speed is gel electrophoresis.An electric current is used to draw DNA samples through a gel after they have been loaded into wells (indentations) at one end of the gel. Due to their negative charge, DNA fragments gravitate toward the positive electrode.

In order to test the safety of vaccines before they are administered to humans, transgenic mice are being created. The safety of the polio vaccine is being tested in transgenic mice. In order to better understand how genes contribute to the development of disease and to investigate potential new treatments, many transgenic animals are created. Many human diseases, including cancer, rheumatoid arthritis, Alzheimer’s disease, hemophilia, thalassemia, and cystic fibrosis, now have transgenic models available.

Bacteria do not require genetic programming to be photosynthetic. Bacteria that can photosynthesize exist naturally. However, some bacteria, like those that produce insulin, eat oil, and extract metals, are not found naturally and must be genetically engineered to do so.

DNA from two or more sources is combined to create recombinant DNA, or rDNA.

DNA probes are single-stranded DNA segments that are used to hybridize and find complementary nucleic acid sequences, or target sequences.

An enzyme that cleaves DNA into fragments at or close to particular recognition sites within molecules known as restriction sites is called a restriction enzyme, restriction endonuclease, or restrictase.

Any alteration to a DNA sequence is called a mutation. Errors in DNA copying that occur during cell division, ionizing radiation exposure, exposure to chemicals known as mutagens, or viral infection can all cause mutations.

DNA polymerase’s primary job is to create DNA from its building blocks, deoxyribonucleotides. Nucleotides and bases found on each strand of the original DNA molecule are paired to create the DNA copies. Helicases are enzymes that create the template during DNA replication. After that, DNA polymerase used a DNA template to synthesize the DNA.

The relative positions of genetic markers, which represent the locations of genomic variants, on a chromosome are displayed on a genetic map, also known as a linkage map.

Adding a particular DNA sequence to a plant’s genome to give it new or different traits is known as genetic modification. This can entail altering the plant’s growth pattern or conferring disease resistance.

Severe combined immunodeficiency (SCID) is frequently caused by adenosine deaminase deficiency (ADA deficiency), an inherited disorder that impairs the immune system.

A single-stranded DNA or RNA sequence called an aporom is used to look for its complementary sequence in a genome sample. DNA probes are crucial diagnostic instruments that guarantee high sensitivity and specificity. They are employed in PCR and other molecular biology techniques. A laboratory method for identifying and locating a particular DNA sequence on a chromosome is called fluorescence in situ hybridization, or FISH. The method is based on exposing chromosomes to a probe, which is a short DNA sequence with a fluorescent molecule attached.

Gene therapy is an experimental approach that replaces the faulty allele in an allele to treat or prevent disease. In the future, this method might enable medical professionals to treat a condition by introducing a gene into a patient’s cells rather than relying on medication or surgery.

During gel electrophoresis, agarose gel is utilized. When the restriction fragments are run on the agarose gel, they can be sorted based on their length (molecular weight or size).

DNA polymerase (also known as Taq polymerase) and other enzymes produced by the heat-tolerant bacterium “Thermos aquaticus” are resistant to high temperatures. In PCR, the template DNA is denatured, or its strands separated, by applying a high temperature (denaturation temperature). This DNA polymerase’s ability to tolerate the high temperatures used in PCR allows it to function effectively without becoming denaturated, which permits the reaction to proceed as intended. Option B is therefore the right response.

Since most enzymes can function quickly and speed up reactions, Option A is not limited to this particular enzyme.

All of the molecular components listed above are used in recombinant DNA technology because, to put it simply, the technology’s primary goal is to use molecular scissors to cut a segment of DNA (the gene of interest) from another DNA segment. In order to guarantee that the foreign gene segment is permanently incorporated into the host’s DNA, the isolated gene is then inserted into the host organism’s DNA using molecular glue.

Primers are tiny, chemically synthesized oligonucleotides found at the 3′ end of the template DNA that complement the sequences. One to each double helix strand, they hybridize to the target DNA region. Because these primers are oriented with their ends facing one another, the DNA can synthesize in that direction. Therefore, the primer is a brief single-stranded DNA sequence that identifies the area of the DNA that requires amplification by hybridizing with the template DNA.

The right response is this choice. Liposomes, which are microscopic vesicles, can be used as a delivery system to introduce a healthy gene into diseased cells in cystic fibrosis. The goal of this method, called gene therapy, is to substitute a functional CFTR gene for the defective one that causes cystic fibrosis.

Genetic engineering is the process of changing the genetic material by either adding or deleting elements.

A laboratory technique called polymerase chain reaction, or PCR for short, can quickly create (amplify) millions to billions of copies of a particular DNA segment so that it can be examined in more detail.

In DNA recombinant technology, plasmids—small, circular, double-stranded DNA molecules—are modified and subsequently introduced into cells.

Through the repair or reconstruction of damaged genetic material, gene therapy is a branch of medicine that focuses on genetically altering cells to produce a therapeutic effect or to treat disease. Cancer, scid, and cystic fibrosis can all be treated with gene therapy. However, it doesn’t cure tuberculosis.

The first step involves extracting the mRNA, which is then reversed to create a copy of the DNA. Step three involves cutting DNA with a restriction enzyme, step four involves joining donor DNA to plasmid RNA with a ligase enzyme, and step five involves inserting the recombinant plasmid into the cell.

DNA that has been modified by fusing genetic material from two distinct sources is known as recombinant DNA. To accomplish this, a foreign gene is usually inserted into a plasmid or another vector, resulting in a new DNA sequence that incorporates genes from several different organisms. One essential tool in genetic engineering and biotechnology is recombinant DNA technology.

PCR is a technique for amplifying a particular DNA segment quickly and exponentially.

A person with adenosine deaminase deficiency, an inherited disorder that results in severe combined immunodeficiency syndrome, has almost no immunity to bacteria, viruses, or fungi.

Cloning is an asexual reproduction technique that does not involve inter-gamete contact or fertilization.

Given that it contains every tool needed to engineer a plant cell, this choice is accurate. To remove a fragment of DNA, restriction enzymes are employed. The cut-out gene is engineered and transferred into the protoplast using DNA ligases.