UGC NTA NET/JRF Exam, Forensic Science, February-2023

Metaethics is a branch of philosophy, particularly ethics, that explores the nature, scope, and meaning of moral values, principles, and theories. It does not seek to evaluate specific moral actions or codes of conduct, as is the case with normative ethics or applied ethics.

Instead, it deals with questions like "what does it mean to say something is morally right or wrong?" or "how do we understand the concept of morality itself?".

Topics within metaethics include moral semantics (the meaning of moral language), moral epistemology (the study of how we know what we know about morality), and moral ontology (the nature of moral truths).

Section 45A of the Indian Evidence Act, 1872, allows for the opinion of the examiner of electronic evidence. This is a critical section in the context of growing digitization.

In court proceedings, this provision gives legal recognition to electronic records and their admissibility.

The examiner's opinion could be on any matter related to the electronic record, like its authenticity, source, or integrity. This reflects the changing nature of evidence in the digital age.

Article 21 of the Indian Constitution guarantees the protection of life and personal liberty. It states that "No person shall be deprived of his life or personal liberty except according to the procedure established by law."

The Supreme Court of India has interpreted this article broadly to encompass a range of rights, effectively making it the backbone of fundamental human rights in India.

It includes the right to privacy, right to a healthy environment, right against solitary confinement, and much more.

The phase contrast microscope was invented and developed by Frits Zernike, a Dutch physicist, who received the Nobel Prize in Physics in 1953 for this work.

This type of microscope enhances the contrast in unstained, transparent samples, allowing for detailed study.

It works by transforming slight changes in phase into corresponding changes in amplitude, which can be visualized as differences in light intensity. This makes it invaluable for examining living cells or organisms.

Broadband decoupling, gated decoupling, and pulsed decoupling are techniques associated with 13C NMR (Nuclear Magnetic Resonance). NMR is a powerful tool used in research to determine the physical and chemical properties of atoms or molecules.

These decoupling techniques are used to simplify NMR spectra by removing spin-spin coupling, making it easier to interpret the results. They are particularly useful in 13C NMR, where carbon atoms are being studied.

The indirect ELISA (Enzyme-Linked Immunosorbent Assay) is also known as the Triple Antibody Sandwich ELISA. This assay involves an antigen being captured by a specific antibody, then detected by another, separate specific antibody which is linked to an enzyme.

A third component, a substrate, is added that the enzyme can convert to some detectable signal. This provides a sensitive method to detect specific antigens in а sample.

The Hardy-Weinberg equilibrium is a principle that states that both allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.

These influences can include genetic mutation, gene flow, genetic drift, non-random mating, and selection. The principle serves as a foundation of population genetics and helps scientists to understand the genetic variation within a population.

Glycoprotein P30, also known as Prostate Specific Antigen (PSA), is primarily present in semen. It is a protein produced by cells of the prostate gland in men.

In forensics, detection of P30 is used as a marker to indicate the presence of seminal fluid in samples collected from crime scenes.

The Brentamine Fast Blue Test is not used for the identification of saliva samples. The test is typically used for the detection of proteins in biological samples.

For saliva identification, other tests such as the Press Test, Amylase Test, and Starch-Iodine Test are commonly employed.

The Amylase Test, for example, exploits the fact that human saliva contains the enzyme alpha-amylase, which breaks down starches into sugars. This can be used to determine whether a sample contains saliva.

RNA is more acidic than DNA because it contains the sugar Ribose. The key difference between Ribose and the sugar in DNA (Deoxyribose) is that Ribose has a hydroxyl (-OH) group on the 2' carbon of its sugar ring.

The additional oxygen atom in the hydroxyl group increases the acidity compared to Deoxyribose. This -OH group is important for RNA structure and function, but it also makes RNA more reactive and less stable than DNA.