Cells and Heredity Chapter 3.1

Read pg 33 “Cells and Spacesuits” Bell Work 9/14/11 Read pg 33 “Cells and Spacesuits” Make a Venn diagram to compare and contrast the cell and spacesuits

3.1 Vocabulary Cell membrane – The outer boundary of the cytoplasm, a layer that controls what enters or leaves the cell. Nucleus – The structure in a eukaryotic cell that contains the genetic material a cell needs to reproduce and function. Cycle – a series of events or actions that repeat themselves regularly

3.1 Vocabulary DNA (p74) – The genetic material found in all living cells that contains the information needed for an organism to grow, maintain itself, and reproduce. Chromosome (p75) – The physical structure in a cell that contains the cell’s genetic material

3.1 Notes Cell division is involved in many functions. Cell division occurs in all organisms. You grow because your cells divide and produce more cells All new cells are produced from other cells.

Cell Division 1. Unicellular (Procaryotic cells, no nucleus with enclosed membrane)- reproduce through binary fission.

Cell Division Eukaryotic Cell (multicellular with a nucleus with an enclosed membrane)- Mitosis cell division is involved in growth, development, and repair, as well as in reproduction.

Cell Division occurs through a process called mitosis Mitosis only occurs in multicellular organisms. Growth Development Repair

DNA Made up of two strands of molecules. Made up of subunits called nucleotides. The genetic material that contains information for a cell’s growth and function

Genetic material of eukaryotic cells is organized in chromosomes DNA- deoxyribonucleic acid- is a chemical that contains information for an organism’s growth and functions.

Chromosomes DNA is wrapped around proteins like thread around a spool and compacted into structures. Before division, the chromosomes compact more and become more invisible under a light microscope. During division, a duplicated chromosome can be seen as two identical structures called chromatids that are held together by centromeres.

Bell Work 9/15/11 What is DNA? Where is the DNA located in a Eukaryotic cell? Where is the DNA located in a Prokaryotic cell?

Investigate Chromosomes Pg. 76 in book What did you observe about the loosely balled yarn? What does the loosely balled yarn represent? What does the yarn on the craft sticks represent? Why does the yarn on the craft sticks take up less space than the ball of yarn? Videos: http://kids.britannica.com/comptons/article-9310687/chromosome

Bell Work 9/16/11 Draw a picture of lose DNA. Draw a picture of DNA after its been compacted and label all the parts.

Bell Work 9/10/10 Why do you think injuries to the skin generally heal faster than injuries to the brain? Explain how DNA compacts before a eukaryotic cell divides.

NO Bell Work!!! We are going to the pep assembly, please have out your bell work sheet to turn in.