Question

8) which prevent the union of chromosomes
a)centromeres b) kinetochores.
C) Telomeres
d)Nucleolar organisers​

Answer 1

The telomeres prevent the union of chromosomes.

Explanation:

• Option a: Centromeres is an incorrect option because a centromere is a region of the chromosome that helps to hold pairs of sister chromatids together. They don't prevent the union of chromosomes.
• Option b: Kinetochores is an incorrect option because a kinetochore is a disc-shaped protein that helps to mediate centromeric DNA and microtubule attachment during cell division. They also don't prevent the union of chromosomes.
• Option c: Telomeres are the correct option because they are the short-repeat sequences found at the ends of chromosomes. Its main function is to prevent the fusion or union of chromosomes. It also helps to prevent the degradation of chromosomes.
• Option d: Nucleolar organisers is an incorrect option because a nucleolar organiser helps in the synthesis of rRNA. They also don't prevent the union of chromosomes.

Therefore, the correct option is option c)Telomeres.

Learn more about telomeres and centromeres here:

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Answer 2

Answer:

Correct answer is Telomeres.

Explanation:

What are Telomeres?

• Repetitive DNA sequences at the ends of a chromosome are known as telomeres

• Telomeres are related to aging
• During the aging process, telomeres continues to shorten in length.
• Each time the cell divides, telomeres gets short. Eventually, after too much shortening, chromosome not able to divide and eventually dies afterwards.
• Telomeres also have special functions in protecting the DNA from getting tangled at the ends.
• Latest fact we got to know about telomeres is that in cancer cells they make changes in chromosomes and get their telomeres very long so that the cell thinks that it can divide more, which cancerous cells to the power of infinite division.

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