What is the basic unit of DNA packaging in the eukaryotic nucleus?
Analysis & Theory
The nucleosome is the fundamental unit of DNA packaging, consisting of DNA wrapped around histone proteins.
Which proteins help in the packaging of DNA into chromatin?
Analysis & Theory
Histone proteins organize and compact DNA into nucleosomes within chromatin.
Which of the following describes euchromatin?
A
Densely packed and inactive
B
Lightly packed and transcriptionally active
C
Found only in prokaryotes
D
Visible during mitosis only
Analysis & Theory
Euchromatin is a loosely packed form of DNA that is accessible for transcription.
What is the role of heterochromatin?
C
Gene silencing and structural support
Analysis & Theory
Heterochromatin is tightly packed and associated with inactive genes and structural DNA regions.
Where are telomeres located in the genome?
A
In the middle of chromosomes
B
At the ends of chromosomes
Analysis & Theory
Telomeres are repetitive DNA sequences located at the ends of linear chromosomes.
Which of the following best defines a genome?
A
All the proteins in a cell
C
The entire set of DNA in an organism
Analysis & Theory
The genome is the complete set of DNA, including both coding and non-coding regions.
What is a gene?
B
A unit of heredity encoding a protein or RNA
C
Only the coding regions of DNA
Analysis & Theory
A gene is a DNA sequence that encodes a functional product, such as a protein or RNA.
Which structure separates the nuclear genome from the cytoplasm?
Analysis & Theory
The nuclear envelope is a double membrane that encloses the nucleus, separating it from the cytoplasm.
How many chromosomes are present in the human somatic cell nucleus?
Analysis & Theory
Human somatic cells have 46 chromosomes—23 pairs (22 autosomes and 1 pair of sex chromosomes).
Which part of the chromosome contains the genes?
Analysis & Theory
Chromatin consists of DNA and proteins, and it's where the genetic material (genes) is stored.