In the 1950s, what discovery revolutionized biotechnology?

a.) cloning sheep
b.) using electrons for microscopes
c.) splicing genes
d.) molecular structure of dna

In the 1950s, the discovery of molecular structure of DNA revolutionized biotechnology.

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Answer is option D - molecular structure of DNA.

Explanation:

James Watson and Francis Crick discovered the molecular structure of DNA and mark a milestone in the history of the molecular biology and revolutionized biotechnology. They presented double helix, the twisted-ladder structure of DNA in 1953 and won Noble prize for their discovery in 1962. Though DNA was discovered in 1869. The X-ray crystallography data they presented showed that it is a helix structure composed of two strands coiled together.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.

the answer is definitely a