Electron Microscopy of a Eukaryotic Cell During Interphase of the Cell

question 3

Multiple Choice

Electron microscopy of a eukaryotic cell during interphase of the cell cycle shows 10-nm thick chromatin fibers with a "beads on a string" appearance.  These chromatin fibers are extracted and treated with an endonuclease, which preferentially cleaves the "string" portions of the chromatin.  Further evaluation of the "beads" reveals that they are composed of DNA wrapped around a core of proteins.  Which of the following proteins is most likely found outside of this core and helps promote chromatin compaction?

• A)Histone H1
• B)Histone H3
• C)Histone H4
• D)snRNP
• E)Topoisomerase II
• F)Ubiquitin

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Definitions:

Command-and-control Regulation

A regulatory approach where the government sets specific limits or standards for various aspects of business operations to control or reduce negative externalities.

Opportunity Cost

The relinquishment of potential profits from various alternatives upon choosing a certain one.

Lobster Population

The lobster population refers to the number of lobsters living in a particular area or region, which can fluctuate based on factors like fishing practices, environmental conditions, and predator-prey dynamics.

Environmental Preservation

The practice of protecting the natural environment on individual, organizational, or governmental levels, aimed at keeping ecosystems intact and safeguarding biodiversity.