Question

Which of the following are examples of heterochromatin? Select all that apply. Select all that apply. centromeric DNA repetitive DNA telomeric DNA

Answer 1

Examples of heterochromatin include centromeric DNA, repetitive DNA, and telomeric DNA. These regions are tightly packaged and generally not transcribed which contributes to their classification as heterochromatin.

Step-by-step explanation:

In answering the question of which regions of chromatin are examples of heterochromatin, we must look at the structure and packaging specificity of eukaryotic chromosomes. Heterochromatin is the region of a chromosome that is tightly compacted and is generally transcriptionally inactive. It is typically found at the centromere and telomeres of chromosomes. These regions are important for chromosome stability and segregation during cell division. Repetitive DNA, which is often also found in heterochromatic regions due to its structural role and lack of transcriptional activity, qualifies as well.

Considering the characteristics of heterochromatin, the examples of this densely packed chromatin are: centromeric DNA, repetitive DNA, and telomeric DNA. These areas are known to be less accessible to transcriptional machinery and are therefore not typically transcribed into RNA.

Answer 2

The heterochromatin refers to a condense packed form of DNA and is categorized into two types as facultative and constitutive heterochromatin. These kinds of heterochromatin perform an essential function in the expression of genes.

The distinguishing characteristic of heterochromatin is the prevalence of genetically inactive sequences that are called satellite sequences. Therefore, it generally comprises the repetitive sequences of DNA. The distinct examples of heterochromatin are telomere, centromere, and repetitive DNA. Hence, all the given options are correct.