Question

Which of the following statements in TRUE? Select one: a. Euchromatin is most easily viewed in interphase cells. b. Heterochromatin is composed of damaged DNA that is waiting to undergo repair before DNA can be replicated. c. Many active genes are found in heterochromatin, because proteins involved in transcription can easily access these regions of DNA. d. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. e. Euchromatin is composed of damaged DNA that is waiting to undergo repair before DNA can be replicated.

Answer 1

Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. (Ans. D)

Step-by-step explanation:

Euchromatin: It is a form of chromatin which is lightly packed opposed to heterochromatin, which is densely packed. The presence of euchromatin usually reflects the cell are transcriptionally active in nature, which means they are actively transcribing DNA to mRNA.

The DNA is present in eukaryotic cells is arranged in complex comprising proteins and genes. These complexes are known as chromatin, and they exist in 2 forms euchromatin is also known as beads on a string structure and heterochromatin.

Euchromatin, because of the resemblance between a necklace of beads connected through a string and the nucleosomes connected with the help of linker DNA. After that, the euchromatin is consequently leaves the linker DNA exposed so that it can be transcribed. So, this way DNA and RNA polymerase as well as other proteins can access the DNA.

Answer 2

B. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA.

Step-by-step explanation:

Euchromatin is the loosely coiled chromatin and is capable of undergoing the process of transcription. On the other hand, heterochromatin is the highly coiled and compacted chromatin present in its inactive state. Active genes are associated with more loosely packed chromatin, which is the euchromatin. This is due to the fact that the DNA in euchromatin is not tightly packed which in turn allows its interaction with a transcription factor. The tightly packed DNA of heterochromatin cannot interact with proteins requires for gene expression.