May Alrashed, PhD 2015-2016 May Alrashed, PhD Eukaryotes vs. Prokaryotes Eukaryotes (animals, plants, fungi, protists). prokaryotes (bacteria) differ.

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May Alrashed, PhD

May Alrashed, PhD

Eukaryotes vs. Prokaryotes Eukaryotes (animals, plants, fungi, protists). prokaryotes (bacteria) differ greatly in structure May Alrashed, PhD

Prokaryotic Cell May Alrashed, PhD

May Alrashed, PhD Eukaryotic Cell Eukaryotes are generally more advanced than prokaryotes

May Alrashed, PhD Eukaryotic Cell Eukaryotic cells are found in animals, plants, fungi and protists cell; Cell with a true nucleus, where the genetic material is surrounded by a membrane; Eukaryotic genome is more complex than that of prokaryotes and distributed among multiple chromosomes; Eukaryotic DNA is linear; Eukaryotic DNA is complexed with proteins called histones; Numerous membrane-bound organelles; Complex internal structure; Cell division by mitosis.

May Alrashed, PhD Prokaryotic Cell Unicellular organisms, found in all environments. These include bacteria and archaea; Without a nucleus; no nuclear membrane (genetic material dispersed throughout cytoplasm; No membrane-bound organelles; Cell contains only one circular DNA molecule contained in the cytoplasm; DNA is naked (no histone); Simple internal structure Cell division by simple binary fission.

May Alrashed, PhD

May Alrashed, PhD Structural Organization of Eukaryotic and Prokaryotic Cells

May Alrashed, PhD Nucleus Control center of cell Double membrane Contains Chromosomes Nucleolus

Components of Nucleus 1. Nuclear Envelope – pore riddled 2. Nucleoplasm – Fluid interior portion 3. Nucleolus – Dense cluster of RNA & Proteins – ribosomes 4. Chromatin – all DNA + Proteins May Alrashed, PhD Adapted from

Nucleolus May Alrashed, PhD The size of the nucleolus is associated with synthetic activity of the cell. Functions: a)Synthesis of r-RNA. b)It helps in formation of ribosome subunits. c)Play an important role in cell division. Spherical body in all eukaryotic cells that disappear during cell division. Associated with specific region in the chromosomes – called nucleolar organising region.

Chromatin & Chromosome May Alrashed, PhD Nucleus contains thread like structures- chromatin Chromatin Chromatin A mass of genetic material composed of DNA and proteins that condense to form chromosomes. Chromosome Chromosome Is an organized structure of DNA and protein that is found in cells. Chromatid Chromatid Is the daughter strand of a duplicated chromosome that is joined by a single centromere.

May Alrashed, PhD

Chemical composition of Chromosome Eukaryotic chromosomes: two broad components. 1. Nucleic acids: - DNA (primary nucleic acid) + small amt of RNA (transit to the cytoplasm) 2. Proteins: I. Histones (basic pH) – core histones (H2A, H2B, H3 & H4), Linker histone (H1) II. Non Histone proteins May Alrashed, PhD

May Alrashed, PhD Histones bind to negatively charged DNA – stability to the DNA Mixture of DNA & proteins – basic structural unit of chromosomes - chromatin fiber E/M examination of interphase chromatin – ellipsoidal beads joined by linker DNA known as Nucleosomes.

Nucleosome Simplest packing of DNA strands 146 bp DNA wrapped around histone octamer Octamer = 2 copies of 4 core histones DNA length varies b/w species Core DNA – DNA associated with histone octamer Linker DNA – DNA b/w histone octamer – 8 to 114 bp May Alrashed, PhD

Model of packing of chromatin and the chromosome scaffold in metaphase chromosome May Alrashed, PhD

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