All GRE Subject Test: Biology Resources
Example Questions
Example Question #1 : Understanding Structures And Proteins In Dna
Which of the following proteins is necessary for nucleosome formation?
Possible Answers:
Chromatin
Nuclear lamin
Histones
Histone methyltransferases
DNA ligase
Correct answer:
Histones
Explanation:
The correct answer is histones. DNA wraps around histones to form the nucleosomes. Further condensation of many nucleosomes results in chromatin (DNA state). Histone methyltransferases are important enzymes that modify histones during epigenetic gene regulation; however, they are not necessary for nucleosome formation. DNA ligase is responsible for catalyzing the formation of phosphodiester bonds, but is unrelated to nucleosome formation.
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All GRE Subject Test: Biology Resources
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