Question
Download Solution PDF______ affects the atoms in living cells and thereby damages their genetic material (DNA).
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- The correct answer is Option 4, i.e Ionising radiation.
- Ionising radiation affects the atoms in living cells and thereby damages their genetic material (DNA).
- Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes.
- When cells are exposed to ionizing radiation, radio chemical damage can occur either by direct action or indirect action.
- Direct action occurs when alpha particles, beta particles, or x-rays create ions that physically break the base pairs of the DNA.
- Friedrich Miescher: In 1869, Swiss chemist Friedrich Miescher was the first to identify DNA. He isolated a substance he called "nuclein" from the nuclei of white blood cells, which was later identified as DNA.
- James Watson and Francis Crick: In 1953, American biologist James Watson and British physicist Francis Crick discovered the double helix structure of DNA. Their model revealed how DNA could carry genetic information and replicate.
Deoxyribonucleic acid (DNA) is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth, and reproduction of all known organisms.
Last updated on Jun 11, 2025
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