Histones

question 54

Multiple Choice

Histones:

• A) account for 1/4 the mass of the eukaryotic chromosome.
• B) complex with RNA to form spliceosomes.
• C) are bound to DNA in the transcriptional units of both active and inactive genes.
• D) are small Glu+Asp_ rich proteins that facilitate compaction of eukaryotic DNA in the nucleus.
• E) are a highly conserved class of proteins with the most conserved being the linker histone Hl.

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Definitions:

Cleavage

The tendency of a mineral to break along flat, well-defined planes, reflecting its crystal structure.

Hematite

An iron oxide metal that has a reddish streak and commonly forms under oxidizing conditions.

Magnetite

An iron oxide mineral that is typically black and is strongly magnetic.

Quartz

A very common rock-forming silicate mineral consisting of crystalline silica.