Each chromosome is a package for one very long, continuous strand of DNA.
Organelles in a typical animal cell.
DNA found in the mitochondrion of a cell differs in structure and is separate from the DNA found in the cell nucleus. Mitochondrial DNA, or mtDNA, exists as a circular loop of double-stranded DNA rather than the linear form found in nuclear DNA. However,
Geneticist Kenneth Kidd explains his study of human DNA variation in nuclear chromosomes.
DNA and proteins are key molecules of the cell nucleus.
In this section learn that an activated protein is transported into the nucleus through a pore in the nuclear membrane.
mtDNA testing can be used to identify remains that are now 84 years old.
Friedrich Miescher and Phoebus Levene research nuclein, protein. and DNA.
In 1984, Alec Jeffreys produced the first DNA fingerprint. DNA-based testing methods have evolved over the years, but they still use DNA repeats as the basis for building a DNA profile.
DNA is coiled around proteins and packaged as chromatin within the nucleus of cells. Aaron Klug and Roger Kornberg figured out the structure of chromatin. It has been proposed that the coiling (or rather uncoiling) of DNA is a way of controlling the pro