The following statement is true about euchromatin: A) Present in prokaryotes B)
ID: 91000 • Letter: T
Question
The following statement is true about euchromatin: A) Present in prokaryotes B) Does not exist in human C) Usually transcriptionally inactive D) Usually transcriptionally active. Refer to the following list of enzymes to answer the following questions. The answers may be used once, more than once, or not at all. A. helicase B. nuclease C. ligase D. DNA polymerase I E. primase breaks hydrogen bonds between nitrogen bases and unwinds polynucleotide strands during DNA replication. The nucleotide composition of a DNA molecule was found be 12% "A" and 20% "T". This molecule is a: A) single-stranded DNA B) double-stranded DNA C) single-stranded RNA D) double stranded RNA E) none of the above The following statement is true about nucleosome: A)typically contains 147 nucleotide pairs. B) Histone protein core is surrounded by DNA C) Contains H2A D) Contains H2B E) All of the above statements are true. The leading and the lagging strands differ in that A) the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized is the opposite direction. B) the leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5' end. C) the leading strand is synthesized continuously, whereas the lagging strand is synthesized in short fragments that are ultimately stitched together. D) both A and BExplanation / Answer
11. Answer is D.
Euchromatin is a lightly packed form of chromatin (DNA, RNA and protein) that is enriched in genes, and is often, but not always, under active transcription.
12.Answer is A-Helicase
13. Answer is A.
As per Chargaff’s rule, A+T= G+C and A=T and G=C holds true for double stranded DNA. Here A is not equal to T. Therefore inference is that it is a single stranded DNA.
14. Answer is E.
The nucleosome is the fundamental subunit of chromatin. Each nucleosome is composed of a little less than two turns of DNA wrapped around a set of eight proteins called histones, which are known as a histone octamer. Each histone octamer is composed of two copies each of the histone proteins H2A, H2B, H3, and H4.
15. Answer is C.
At a replication fork, both strands are synthesized in a 5 3 direction. The leading strand is synthesized continuously; whereas the lagging strand is synthesized in short pieces termed Okazaki fragments.