Enzymes

Restriction enzymes are proteins used in molecular biology to cut DNA at specific sequences. There are several types of restriction enzymes, primarily classified into exonucleases and endonucleases. Let's evaluate each statement to identify inaccuracies:

• Exonucleases remove nucleotides from ends of the DNA. Exonucleases function by cleaving nucleotides one at a time from the end of a DNA molecule, confirming this statement as correct.
• Endonucleases make cuts at specific positions within the DNA. Endonucleases create cuts at defined sites within DNA, which is essential for various genetic engineering processes. This statement is also correct.
• Ligases join sticky ends of DNA together. DNA ligases are crucial enzymes that repair, replicate, and recombine DNA by joining the sugar-phosphate backbone of DNA strands. They effectively join sticky or blunt ends, accurately described here.
• The first restriction endonuclease was Hind II. The first identified and characterized restriction endonuclease was EcoRI. Hind II was among the first restriction endonucleases discovered, but not the very first. Therefore, this statement is incorrect.

Therefore, the incorrect statement is: "The first restriction endonuclease was Hind II."

The question asks for the enzyme that can polymerize RNA in a template-independent manner. Let's analyze the given options:

• Mononucleotide phosphorylase: This enzyme does not play a role in RNA polymerization. It is involved in phosphorolysis of nucleotide monophosphates.
• Polynucleotide phosphorylase: It is capable of polymerizing ribonucleotides into RNA without a template. Thus, it can synthesize RNA with defined sequences in a template-independent manner.
• RNA polymerase - I: This enzyme is responsible for transcribing ribosomal RNA (rRNA) and requires a DNA template.
• DNA-dependent RNA polymerase: This enzyme catalyzes the synthesis of RNA using a DNA template and is template-dependent.

Thus, the correct enzyme that polymerizes RNA in a template-independent manner is Polynucleotide phosphorylase.

To correctly match List-I with List-II, we need to understand the association between the genes/products and their applications or uses:

(A) C-Peptide: C-Peptide is a part of the proinsulin molecule, and its primary use is related to insulin. Therefore, it matches with (III) Insulin.

(B) α-1-antitrypsin: This is a protein that protects tissues from enzyme damage, particularly used in the treatment of emphysema related to α-1-antitrypsin deficiency. Thus, it matches with (IV) Emphysema.

(C) cryIAc: This gene is derived from Bacillus thuringiensis and is used in genetically modified crops to confer resistance to certain pests, like the corn borer. So, it matches with (I) Corn borer.

(D) α-lactalbumin: This protein is associated with milk production in mammals and is linked to the transgenic cow named Rosie, which produced milk with higher nutrition. Therefore, it matches with (II) Rosie.

Thus, the correct set of matches is (A)-(III), (B)-(IV), (C)-(I), (D)-(II).