Select wrong statement:
First transgenic animal was sheep
Let's analyze each statement to identify the incorrect one concerning transgenic organisms and key biological discoveries.
Understanding Transgenic Organisms and Historical Facts
A transgenic organism is one that has had its genetic material (DNA) altered using genetic engineering techniques. This often involves introducing a gene from another organism to give the recipient new traits. Let's look at the statements provided:
Analyzing the Statements
- Statement 1: First transgenic animal was sheep This statement claims that the first transgenic animal was a sheep. Historically, the first transgenic animal successfully created was not a sheep but a mouse. In 1982, researchers Ralph L. Brinster and Richard Palmiter created 'supermice' by introducing growth hormone genes from rats into mouse embryos, resulting in mice that grew significantly larger than normal. Therefore, this statement is incorrect.
- Statement 2: First transgenic plant was tobacco This statement claims the first transgenic plant was tobacco. Research conducted in the early 1980s by different scientific groups independently led to the creation of the first transgenic plants. Tobacco was one of the first plant species in which successful genetic transformation was demonstrated, making this statement correct.
- Statement 3: First transgenic crop in India is Bt-Cotton This statement refers to the first transgenic crop approved for commercial cultivation in India. Bt-Cotton, genetically modified to resist the bollworm pest using a gene from the bacterium Bacillus thuringiensis (Bt), was approved for commercial cultivation in India in 2002. It was indeed the first transgenic crop allowed for farming in the country, making this statement correct.
- Statement 4: Banting and Best were the first to isolate insulin from dog's pancreas This statement pertains to a significant discovery in medicine. In 1921, Frederick Banting and Charles Best, working with J.J.R. Macleod and James Collip, successfully isolated insulin from the pancreas of dogs. This groundbreaking work led to the development of insulin therapy for diabetes. This statement is historically accurate, making it correct.
Based on the analysis, the statement that the "First transgenic animal was sheep" is the incorrect one.
Summary of Findings
| Statement | Accuracy | Explanation |
|---|---|---|
| First transgenic animal was sheep | Wrong | The first transgenic animal was a mouse. |
| First transgenic plant was tobacco | Correct | Tobacco was one of the first successfully transformed plants. |
| First transgenic crop in India is Bt-Cotton | Correct | Bt-Cotton was the first transgenic crop approved in India. |
| Banting and Best were the first to isolate insulin from dog's pancreas | Correct | Historically accurate discovery of insulin isolation. |
Therefore, the wrong statement among the given options is that the first transgenic animal was a sheep.
Important Questions from Biotechnology
Given below are two statements :
Statement I:
Restriction endonucleases are enzymes naturally found in bacteria, where they protect the host cell by degrading foreign DNA.
Statement II:
All restriction endonucleases cut both strands of the DNA molecule at the exact same position, producing 'blunt ends'.
In the light of the above statements, choose the most appropriate answer from the options given below:
'Golden rice' variety of rice shows:
First restriction endonuclease enzyme was-
The main technique involved in agricultural biotechnology is
Consider the following statements :
Statement I: Bacillus thuringiensis (Bt) is a microbial pesticide.
Statement II: Beaveria bassiana is a fungus used as a pesticide.
