Not applicable for a biopatent:

A biopatent is a patent that protects inventions in the field of biotechnology. It covers any technology that uses living organisms, biological systems, or derivatives thereof, to make or modify products, to improve plants or animals, or to develop new processes. However, not all biotechnological discoveries are eligible for patent protection. Let's look at the answer choices and determine which of them is not applicable for a biopatent.

Formation of new products:
One of the main purposes of biopatenting is to protect new and useful products that are derived from living organisms or biological systems. The products can be anything from drugs, vaccines, and diagnostics to genetically modified organisms, biofuels, and industrial enzymes. Biopatenting helps to ensure that the inventors can profit from their innovations and that the public can benefit from the increased availability of these products.

Unearthing the DNA sequences:
DNA sequencing is a common method in biotechnology that involves determining the order of nucleotides in a DNA molecule. It has many applications, such as identifying genes, diagnosing diseases, and studying evolutionary relationships. In some cases, DNA sequences can be patented if they are novel, non-obvious, and useful. However, there is an ongoing debate about whether DNA should be patentable at all, as some argue that it is a product of nature and therefore not eligible for intellectual property protection.

Discovery of cell lines:
Cell lines are cultures of cells that have been isolated from a tissue or an organism and can be grown in vitro under specific conditions. They are widely used in biotechnology for research, drug development, and biomanufacturing. In some cases, cell lines can be patented if they are novel, non-obvious, and useful. However, there are also ethical and legal issues surrounding the ownership and use of cell lines, especially those derived from human tissues.

Using the existing technology to produce new products:
This answer choice implies that the invention is not based on a new technology but rather on a combination of existing technologies to produce a new product. In general, such inventions are less likely to be granted a patent because they may not meet the criteria of novelty, non-obviousness, and utility. To be eligible for a patent, an invention must be more than just a routine application of known techniques or methods. It must demonstrate a significant advance in the state of the art and have some practical application.

Conclusion:
In summary, all of the answer choices are potentially applicable for a biopatent, except for the one that involves using existing technology to produce new products. However, the eligibility of a biotechnological invention for patent protection depends on several factors, such as its novelty, non-obviousness, utility, and ethical considerations. As such, each invention must be evaluated on a case-by-case basis to determine whether it meets the requirements for patentability.