Which of the following statements describes the eukaryotic...

Which of the following statements describes the eukaryotic chromosome? A It is composed of DNA alone. B Active transcription occurs on heterochromatin but not euchromatin. C It consists of a single linear molecule of double-stranded DNA plus proteins. D The nucleosome is its most basic functional subunit E The number of genes on each chromosome is different in different cell types of an organism.

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0:00 Hi everyone.

00:01 So in this question we need to find out the correct statement with respect to the eukaryotic chromosome.

00:06 So the first statement says that eukaryotic chromosome comprised of only dna, which is incorrect.

00:12 Because eukaryotic chromosome comprised of dna along with the histone proteins.

00:19 So it is composed of dna along with the proteins.

00:22 Okay.

00:23 And in histone proteins, h2a is present, h2b is present, h3 is present.

00:30 H4 is present and h1 histone is also present.

00:34 Now, talking about the second option, which says that active transcription occurs on heterochromatin and not an uchromatin.

00:41 So this statement is false because active transcription is going to happen on the eukromatin.

00:48 All right, and not on the hetachromatin because heterochromatin is tightly packed the form of the dna in the chromosome.

00:56 So we can write here that the heterochromatin, this is tightly packed.

01:01 So this heterochromatin, this is darkly stained as well as this is tightly packed as a result of which it is darkly stained.

01:11 Okay, so we can write here it is tightly packed.

01:14 All right.

01:15 And when we look at eochromatin, so eukromatin is the region which is loosely packed.

01:22 Eucromatin is the region which is loosely packed.

01:27 All right.

01:28 So the state.

01:29 So the state is the region which is loosely packed.

01:30 We can say that it is lightly stained because of the low dna density.

01:36 Alright, so because of the loosely packed dna in case of the eukromatin, there would be the active transcription...

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