Consider statements about biotechnology: 1. Transgenic organisms contain foreign DNA. 2. Cloning produces genetically identical copies. 3. Gene therapy cures all genetic diseases. Which are correct? MCQ with Answer and Explanation

Consider statements about biotechnology: 1. Transgenic organisms contain foreign DNA. 2. Cloning produces genetically identical copies. 3. Gene therapy cures all genetic diseases. Which are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1 and 2 only
D. 1, 2 and 3
Answer: Option C
Solution (By JKSSB Mock Tests)
Transgenic organisms (plants or animals) have been genetically modified to contain and express foreign DNA (a transgene) from another species. Cloning is a technique used to produce genetically identical copies of a biological entity, such as a cell, organism, or DNA sequence. Gene therapy is an emerging technique aimed at treating or curing genetic diseases by introducing functional genes, but it is still largely experimental and does not currently cure all genetic diseases. Thus, statements 1 and 2 are correct.

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Practice More Biology Questions

Question #1
Consider statements about gymnosperms: 1. They bear naked seeds. 2. They are mostly evergreen trees. 3. They undergo double fertilization. Which are correct?
A. 1, 2 and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only

Correct Answer: Option C


Explanation:
Gymnosperms are seed-producing plants where the ovules are not enclosed in an ovary; hence, the seeds are naked. They are predominantly perennial, evergreen, woody trees like pines and cedars. Double fertilization and the formation of triploid endosperm are unique characteristics of angiosperms, not gymnosperms. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology
Question #2
Which of the following is a correct statement about a typical bacterium?
A. It has a nuclear membrane.
B. Its DNA is circular and located in the nucleoid.
C. It has linear chromosomes.
D. It contains mitochondria.

Correct Answer: Option B


Explanation:
Bacteria are prokaryotes with a single circular chromosome in a nucleoid region, without a nuclear membrane. They lack membrane-bound organelles like mitochondria. Their chromosomes are not linear; eukaryotes have linear chromosomes.

This question belongs to: Science Biology
Question #3
The scientist who discovered the bacterium that causes leprosy was:
A. Louis Pasteur
B. Robert Koch
C. Albert Neisser
D. Gerhard Armauer Hansen

Correct Answer: Option D


Explanation:
G.H.A. Hansen discovered Mycobacterium leprae in 1873, the first bacterium identified as causing a human disease. Koch later discovered TB.

This question belongs to: Science Biology