Which statement about eukaryotic chromosomes is not true? a....

Name: Problem 1, Chapter 9: Life: The Science of Biology
Uploaded: 2021-05-08T22:07:24-08:00
Duration: 1 min 4 s
Channel: Christina Sorrentino
Description: Which statement about eukaryotic chromosomes is not true? a. They sometimes consist of two chromatids. b. They sometimes consist of a single chromatid. c. They normally possess a single centromere. d. They consist of proteins. e . They are clearly visible as defined bodies under the light microscope.

Which statement about eukaryotic chromosomes is not true? a. They sometimes consist of two chromatids. b. They sometimes consist of a single chromatid. c. They normally possess a single centromere. d. They consist of proteins. e . They are clearly visible as defined bodies under the light microscope.

Which statement about eukaryotic chromosomes is not true?
a. They sometimes consist of two chromatids.
b. They sometimes consist of a single chromatid.
c. They normally possess a single centromere.
d. They consist of proteins.
e . They are clearly visible as defined bodies under the light microscope.

Key Concepts

Chromatid Arrangement

Eukaryotic chromosomes exhibit variability in the number of chromatids depending on the cell cycle stage. In a non-dividing (interphase) cell, a chromosome is present as a single chromatid, while after DNA replication and before cell division, each chromosome typically consists of two sister chromatids held together until segregation occurs.

Centromere Function and Structure

The centromere is a critical chromosomal region that plays a key role in the proper separation of chromosomes during cell division by serving as the attachment site for spindle fibers. Most eukaryotic chromosomes are monocentric, meaning they have a single centromere, which is essential for orderly distribution during mitosis and meiosis.

DNA-Protein Complex Structure

Eukaryotic chromosomes are composed of both DNA and proteins rather than proteins alone. The DNA carries the genetic information, while proteins such as histones provide structural support and regulate accessibility. This combination forms a highly organized chromatin structure.

Microscopic Visualization

During certain stages of the cell cycle, particularly metaphase, eukaryotic chromosomes condense into distinct, highly visible structures that can be seen under a light microscope. This condensation is critical for the accurate segregation of chromosomes and for cytogenetic studies.

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