Cytology. Key Terms Cytology - the study of the structure and function of cells Cytoplasm - the area of space contained by the cell membrane but outside.

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Presentation transcript:

Cytology

Key Terms Cytology - the study of the structure and function of cells Cytoplasm - the area of space contained by the cell membrane but outside of the nucleus. The contains the organelles and the cytosol. Organelle - tiny structures within the cytoplasm each with its own specific job. Cytosol - the fluid portion of the cytoplasm.

Cell Categories ProkaryotesEukaryotes lack a nucleus contain a nucleus lack membrane covered organelles contain membrane bound organelles ex. bacteria and blue-green algae ex. plants, animals, and fungi

Name as Many Cell Parts as Possible Nucleus DNA/RNA Mitochondria Smooth Endoplasmic Reticulum Rough Endoplasmic Reticulum Ribosomes Cytoplasm Nuclear Membrane Cell Membrane Cell Wall Golgi Apparatus Centriole Vacuole Chloroplasts Flagella/Cilia

The Nucleus Cell Type: - Found in all cells except Prokaryotes (bacteria). Description: - Membrane bound - Consists of a nucleolus, nuclear pores, nucleoplasm, and a nuclear membrane Function: - Contains and protects the cell's genetic information DNA (Deoxyribonucleic acid). - Control center of the cell. What kind of cells? structure

The Parts of the Nucleus Nucleolus (Nucleoli) - site of ribosome formation. Nuclear Membrane/Envelop - membrane surrounding the nucleus. Nuclear Pores - controls what can enter or leave the nucleus.

Nucleoplasm - Surrounded by the nuclear membrane - Similar in function to the cytoplasm of the cell. - highly viscous liquid that surrounds the nucleoli and chromosomes. - contain dissolved enzymes.

DNA - The Human Genome consists of about 30,000 Genes. Genes - a unit of heredity found on a stretch of DNA that codes for a particular function.

Chromatin - a complex of nucleic acids (DNA or RNA) and proteins (histones) which condense to form chromosomes during cell division.

The Structure of DNA DNA is composed of Nucleotides. Each nucleotide is made of the following - a phosphate group - a pentose sugar - a nitrogen base There are five different types of nitrogen bases. - Adenine- Thymine - Cytosine- Guanine - Uracil (seen in RNA as a replacement for Thymine)

When two nucleotide chains connect together they form a Double Helix. antip

When nucleotides join together a covalent bond (phosphodiester bond) created between the 5' end of the phosphate group of one nucleotide and the 3' end of the OH group (found on the sugar) of the other nucleotide.

Each strand of DNA has a backbone of phosphate - sugar - phosphate - sugar... The strands of DNA run antiparallel. The 5' end of one strand must be able to pair with the 3' end of the other. The strands are said to be complementary. If one strand of DNA has a sequence of 5'-ATGGCT-3' the other strand must have the sequence 3'-TACCGA-5'.

Draw a DNA strand with the base sequence A-C-T on the left side. Make the top left the 5'.

Using your textbook, pages , complete the organelle handout sheet for the following organelles: - Ribosome -Endoplasmic Reticulum (Smooth and Rough) - Golgi Apparatus - Lysosomes