Table of Contents
- 1 What nucleus contains chromosomes made of DNA molecules?
- 2 Do all cells contain chromosomes made of DNA?
- 3 How is DNA packaged into a chromosome?
- 4 Where are the chromosomes in DNA?
- 5 How many DNA molecules are in a chromosome?
- 6 What are chromosomes made up?
- 7 Are genes made of chromosomes?
- 8 Is gene made up of chromosomes?
What nucleus contains chromosomes made of DNA molecules?
cell nucleus
Structure of DNA DNA (deoxyribonucleic acid) is the cell’s genetic material, contained in chromosomes within the cell nucleus and mitochondria. Except for certain cells (for example, sperm and egg cells and red blood cells), the cell nucleus contains 23 pairs of chromosomes. A chromosome contains many genes.
Do all cells contain chromosomes made of DNA?
DNA (deoxyribonucleic acid) is the cell’s genetic material, contained in chromosomes within the cell nucleus and mitochondria. Except for certain cells (for example, sperm and egg cells and red blood cells), the cell nucleus contains 23 pairs of chromosomes.
What cells contain what DNA?
Explanation: Eukaryotic cell contains the genomic linear DNA, associated with histone protein, in nucleus; but plastids and mitochondria being semiautonomous organelles, contain their own prokaryotic type circular naked DNA.
What cells contain chromosomes?
Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA).
How is DNA packaged into a chromosome?
Figure 1: Chromosomes are composed of DNA tightly-wound around histones. Chromosomal DNA is packaged inside microscopic nuclei with the help of histones. The 300 nm fibers are compressed and folded to produce a 250 nm-wide fiber, which is tightly coiled into the chromatid of a chromosome.
Where are the chromosomes in DNA?
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
What DNA contains?
nucleotides
What is DNA made of? DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.
How are chromosomes formed in DNA?
DNA wraps around proteins called histones to form units known as nucleosomes. These units condense into a chromatin fibre, which condenses further to form a chromosome.
How many DNA molecules are in a chromosome?
Each chromosome contains a single very long, linear DNA molecule. In the smallest human chromosomes this DNA molecule is composed of about 50 million nucleotide pairs; the largest chromosomes contain some 250 million nucleotide pairs. The diploid human genome is thus composed of 46 DNA molecules of 24 distinct types.
What are chromosomes made up?
A chromosome is made up of proteins and DNA organized into genes. Each cell normally contains 23 pairs of chromosomes.
Where are chromosomes located what are they composed of?
nucleus
Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA).
Where is DNA found in the cell?
Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA). Mitochondria are structures within cells that convert the energy from food into a form that cells can use.
Are genes made of chromosomes?
Genes are made of DNA. Strands of DNA make up part of your chromosomes. Chromosomes have matching pairs of 1 copy of a specific gene. The gene occurs in the same position on each chromosome. Dominant traits are controlled by 1 gene in the pair of chromosomes. Recessive traits need both genes in the gene pair to work together.
Is gene made up of chromosomes?
Chromosome is a thread of DNA, made up of a string of genes. Genes is a length of DNA that codes for a protein. Allele is a version of a gene. A human body (somatic) cell nucleus contains 23 pairs of chromosomes.
Are chromosomes found in the nucleus?
Chromosomes are contained within the nucleus in eukaryotic cells, but can also be found in some of the other organelles such as mitochondria (where DNA is packed into a small circular chromosome). In prokaryotes (e.g. bacteria ), on the other hand, chromosomes form the nucleoid that is located in the cytoplasm given that these organisms do not have a membrane-bound nucleus.
What does a chromosome consist of?
The chromosomes of a eukaryotic cell consist primarily of DNA attached to a protein core. They also contain RNA. They also contain RNA. The remainder of this article pertains to eukaryotic chromosomes.