The Nucleosome Is the Basic Repeating Unit of Chromatin

question 26

Multiple Choice

The nucleosome is the basic repeating unit of chromatin. Which of the following statements concerning nucleosomes is incorrect?

• A) Nucleosomes have protein cores consisting of an octamer of protein subunits.
• B) A segment of DNA approximately 145 bp long is associated with each nucleosome.
• C) Histone H1 contacts the DNA linker segments as they enter and leave the nucleosome.
• D) The DNA in a nucleosome is packed tightly inside the protein core to conserve space in the nucleus and to protect the DNA from damage.
• E) Some nucleosomes form over specific regions of DNA in a non-random manner.

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Definitions:

Gastrula

An early embryonic stage following the blastula, characterized by the formation of three primary germ layers that will develop into different tissues and organs.

Developmental Events

Significant occurrences or processes that contribute to the growth or maturation of an organism at any stage in its life cycle.

Conception

The process of fertilization where a sperm fuses with an ovum, resulting in the formation of a zygote and the beginning of pregnancy.

Menstrual Period

A monthly cycle in which the lining of the womb (uterus) sheds, leading to bleeding through the vagina, part of the female reproductive cycle that prepares the body for pregnancy.