Contents
How many molecules of DNA are on a single chromosome?
Recall that DNA is replicated during the S phase of the cell cycle. Thus during metaphase of mitosis, each chromosome (i.e., each chromatid pair) will contain two molecules of double stranded DNA (one molecule per sister chromatid).
How many DNA molecules are in a cell?
How many DNA molecules are present in a human somatic cell? Short answer: In a normal somatic cell (excluding mature RBCs)— 46. The DNA moleculesreside in the cell nucleus,as 23 chromosomepairs — one set from each parent — for a total of 46 (each chromosome is one DNA molecule, plus packaging proteins).
Is a chromosome a single DNA molecule?
Each chromosome contains a single double-stranded piece of DNA along with the aforementioned packaging proteins. This condensed form is approximately 10,000 times shorter than the linear DNA strand would be if it was devoid of proteins and pulled taut.
What is A single molecule of DNA called?
DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).
What is a single molecule of DNA called?
How many DNA molecules make up a chromosome?
1 DNA strand- This means when you break the double helix and one separate strand I thought one chromatid contain 1 DNA strand and 2 chromatids make a chromosome and 1 DNA molecule. So in a diploid cell you have 46 DNA molecules or 92 strands.
Each chromosome has two chromatids that are joined by a centromere. These chromatids are identical to one another. You could view each chromatid as a separate molecule of DNA. Although there are two molecules of DNA attached to one another, the two sister chromatids are still referred to as one chromosome. Homologous chromosomes then pair up.
Which is the smallest chromosome in the human genome?
Molecules of DNA range in length from hundreds of thousands to millions of base pairs. The smallest chromosome in the human genome, Chromosome 21, has around 48 million base pairs. A molecule of DNA has two strands, composed of nucleotides, that form a double helix shape.
How many DNA strands does a cell have?
I consider one dna molecule to be a double helix. So when the cell is not replicating it has 46 DNA molecules or 92 DNA strands. Well do consider that each DNA strand is covalently bonded together but only hydrogen bonded to its matching strand.