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Chapter 5: Problem 212

Assertion: UV radiation is mutagen. Reason: UV radiation can cause mutation in organism.

Short Answer

Expert verified
Yes, UV radiation is a mutagen because it can cause mutations in organisms.

Step by step solution

01

Understand the terms

Understand and define the terms used in the exercise. UV radiation is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light. A mutagen is any substance or agent that can cause a mutation or increase the rate of mutation. A mutation is a permanent alteration in the DNA sequence that makes up a gene.
02

Relate UV radiation to mutation

Relate the property of UV radiation to causing mutation. UV radiation, like other ionizing radiations, has the ability to cause ionization by ejecting electrons from atoms. This energy can break chemical bonds in molecules such as DNA, leading to mutations.
03

Verify the assertion

Impliment the knowledge acquired in step 2 to verify the assertion 'UV Radiation is a mutagen'. As we have analysed that UV radiation can cause mutation, and given that a mutagen is any agent that induces genetic mutation, it is safe to conclude that UV radiation is indeed a mutagen because it fulfills the criteria of causing mutation.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Mutagen
A mutagen is anything that can change the DNA in a cell causing a mutation. These can be chemicals, radiation, or even physical agents like certain kinds of particles or fibers.
Examples of mutagens include:
  • Chemicals like tobacco smoke or asbestos.
  • Radiation, including UV rays and X-rays.
  • Some viruses and bacteria.
UV light is a common environmental mutagen because it can enter skin cells and directly interfere with DNA.
This means that even a natural source like sunlight can have potentially harmful effects by altering genetic material. Always remember, being too exposed to these mutagens can increase the risk of various diseases, including cancer.
Mutation
A mutation is a permanent change in the DNA sequence of a gene. Mutations can arise naturally as part of cell functioning, or they can be induced by external factors like mutagens.
Mutations are categorized into several types, including:
  • Point mutations: A single nucleotide change.
  • Insertions or deletions: Where additional nucleotides are added or removed.
  • Chromosomal mutations: Larger changes that affect segments of DNA.
While mutations can lead to diseases, they are also essential for evolution and diversity.
This is because they contribute to genetic variation, which can lead to beneficial adaptations over time. Some mutations can be repaired by cell mechanisms, but others may persist and be passed on if they occur in reproductive cells.
DNA sequence alteration
DNA sequence alterations are changes to the order of nucleotides in DNA. UV radiation specifically can cause alterations such as thymine dimers.
These dimers occur when UV light causes two adjacent thymine bases to bind together rather than across the DNA strand.
DNA sequence alterations can disrupt the normal functioning of genes. Common effects include:
  • Interruption of protein codes, affecting how proteins are made and function.
  • Triggering of repair mechanisms which can sometimes result in errors.
  • Potential development of mutations if left unrepaired.
DNA repair systems often catch these alterations, but not always.
When they do occur, the changes can have significant impacts by potentially leading to genetic disorders or various forms of cancer.

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