Tag: science & technology

Introns are non-coding regions within genes that are removed during RNA splicing. They do NOT carry genetic information for protein synthesis - that's the job of exons. The statement correctly identifies that introns are not information-carrying sequences.

Introns are "interrupting" or non-coding sequences that break up the coding regions (exons) within a gene. They interrupt the continuous protein-coding sequence and must be removed by splicing. The term "interrupting sequences" is an accurate description of their structural role.

Gregor Mendel used Pisum sativum (garden pea) for his groundbreaking genetics experiments on inheritance patterns. The other options are incorrect: Oryza sativa is rice, Ficus bengalensis is the banyan tree, and Allium sativum (not Alliivum) is garlic - none were Mendel's experimental organism.

The Central Dogma of molecular biology states that genetic information flows from DNA to RNA to Proteins. DNA is transcribed into RNA, which is then translated into proteins. This fundamental principle correctly describes the directional flow of genetic information in cells.

T.H. Morgan used Drosophila melanogaster (fruit fly) for his pioneering genetics research because of its short life cycle, simple chromosome structure, and easily observable traits. His work with fruit flies established the chromosomal theory of inheritance and discovered sex-linked traits, earning him the Nobel Prize.

DNA bands are visualized using ultraviolet (UV) rays because DNA staining dyes like ethidium bromide intercalate between DNA bases and fluoresce when exposed to UV light. This fluorescence makes the DNA bands visible in gel electrophoresis, allowing researchers to analyze DNA fragments.

RAPD stands for Random Amplified Polymorphic DNA, which is a PCR-based technique used in molecular biology and genetics to detect polymorphisms and genetic variations. It uses short arbitrary primers to amplify random DNA segments, creating unique fingerprint patterns that can distinguish between different organisms or strains.

RFLP is a molecular biology technique where DNA is cut by restriction enzymes at specific recognition sites, producing fragments of varying lengths. The 'R' stands for Restriction, 'F' for Fragment, 'L' for Length, and 'P' for Polymorphism. This technique is used for DNA fingerprinting and genetic analysis.

Sirius, also known as the Dog Star, is the brightest star in Earth's night sky with an apparent magnitude of -1.46. It appears bright due to both its intrinsic luminosity (25 times more luminous than the Sun) and its relative proximity at 8.6 light-years. Sirius is part of the constellation Canis Major and is easily visible in winter skies.

Ganymede is the largest natural satellite in our solar system, with a diameter of 5,268 km - even larger than the planet Mercury. It orbits Jupiter and is the only moon known to have its own magnetic field. Ganymede's surface is a mix of dark, heavily cratered regions and lighter, grooved terrain.