18 Questions
What is the role of the nucleus in a cell?
Storing genetic information
Which term describes the complex consisting of DNA and proteins in the nucleus?
Chromatin fibers
What is the purpose of nucleosomes in DNA organization?
To provide structural support to DNA
What term refers to the condition where chromatin is tightly packed and transcriptionally inactive?
Heterochromatin
Which part of the nucleus contains support filaments and plays a role in the organization of DNA?
Nuclear matrix
How many pairs of chromosomes are present in a human karyotype?
23 pairs
Where are the most transcribed genes usually located in the nucleus?
Euchromatin
Which type of chromatin is highly condensed and metabolically inactive?
Heterochromatin
What is the purpose of the nuclear lamina?
Cell cycle regulation
During which phase of the cell cycle does DNA replication occur?
Interphase
Which part of the nucleus is responsible for rRNA synthesis and initial ribosomal assembly?
Nucleolus
What is the function of euchromatin in the nucleus?
Active chromatin
During which stage of meiosis does chromosome number get reduced by half?
Anaphase I
Which term refers to the level of mitotic activity in a population of similar cells that divide episodically to maintain normal tissue structure?
Stable cell population
Which term describes the condition where an individual has an extra copy of a chromosome, known as trisomy?
Triploidy
What is the term for a chromosomal abnormality involving the absence of a portion of a chromosome?
Deletion
Which type of cell population includes cells like neurons and mature skeletal muscle cells that do not divide after reaching maturity?
Renewing cell population
What process involves two sets of division, with the first reducing the chromosome number by half?
Meiosis
Test your knowledge on DNA content variations and components of the nucleus such as heterochromatin, euchromatin, nuclear proteins, and nucleolus. Explore the differences between highly condensed heterochromatin and active euchromatin.
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