Due to pollution the ozone layer of the Earth is being more and more affected. The main function of ozone is to absorb the Sun's UV radiation. Exposure to UV radiation is known to increase the risk of skin cancers.
Thus, young adults could get higher levels of UV radiation from the sun compared with their grandparents, due to pollution.
Increased sun exposure may also be another cause. Today, it is more and more popular to spend a lot of time at the beach. Traveling to other countries to do this is more accessible today for young adults.
However, tanning beds which are very popular with young people, are another source of high levels of UV radiation.
Answer:
Virus
Explanation:
A virus is an infectious particle which is composed of the genetic material enclosed in a protein structure called capsomere.
Since the virus does not fulfil the criterion of a living thing like it has its metabolism, reproduction, growth, movement and cellular structures therefore it is considered as a non-living thing.
Since the virus does not have reproductive machinery therefore they use the DNA replication machinery of host. They use the host's machinery by integrating their genome in the genome of the host and replicate their genome. Through this mechanism, they make copies of them.
Thus, the virus is the correct answer.
The most obvious way we can establish and maintain a healthy coastal ecosystem is by recycling all recyclable materials and trying to live with as little waste as possible. Also, using clean transportation, such as biking and such, would help slow down air pollution; giving sealife clean air to breathe.
Answer:
By preventing the synthesis of DNA halting cell growth.
Explanation:
Fluorouracil and methotraxate prevent the synthesis of the neucleoside Thymidine thus preventing DNA replication and elongation. Methotraxate has a structure analogous to Folic acid which is important for thymidine synthesis. Thus, it acts as a competitive inhibitor on dihdrofolate reductase an enzyme that is essential for tetrahydrofolate formation, a folic acid derivative.
Fluorouracil acts by inhibiting thymidylate synthase which catalyses an essential step in Thymidine synthesis.