MCAT Biology Chapter 2 - Chromosomes

Histones

Globular proteins that consist of tightly wrapped sections of DNA that are not in use.

Nucleosome

Eight histones wrapped in DNA. In turn, they wrap into coils called solenoids, which wrap into supercoils.

Chromatin

The entire DNA/protein complex, including a small amount of RNA.

46

Number of double stranded DNA molecules inside the nucleus of a human somatic cell.

Chromosome

Chromatin associated with each DNA molecule inside the nucleus of a human somatic cell.

Homologous pair

Two chromosomes that code for the same thing.

Diploid

Any cell that contains homologous pairs.

Haploid

Any cell that does not contain homologous pairs.