AP BIOLOGY

Detailed explanation-1: -These long strands of coiled-up DNA and proteins are called chromosomes. Each chromosome contains many genes. The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression.

Detailed explanation-2: -Floating in the nucleus are thin strands called chromatin, which contains the genetic material, or the instructions for cell functions. The nucleus also contains the nucleolus, a structure where ribosomes are made.

Detailed explanation-3: -Chromosomes, thin strands of heredity material that fill the nucleus, contains information for directing a cell’s functions. For example, the instructions in the chromosome ensure that leaf cells grow and divide to form more leaf cells.

Detailed explanation-4: -Chromosomes and DNA Now that we have a sense of the structure of the nucleus, let’s have a closer look at the genetic information stored inside it: the DNA. Most of an organism’s DNA is organized into one or more chromosomes, each of which is a very long string or loop of DNA.

Detailed explanation-5: -Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. Nuclear DNA does not appear in free linear strands; it is highly condensed and wrapped around nuclear proteins in order to fit inside the nucleus.