BACK TO THE PROPERTIES OF LIFE CELLS REPRODUCTION METABOLISM- USE OF ENERGY HEREDITY RESPONSIVENESS GROWTH AND DEVELOPMENT INTERNAL BALANCE
THIS TIME WE ARE TALKING ABOUT GROWTH AND DEVELOPMENT Which begins in our cells
Since we just finished learning about chloroplasts (photosynthesis) and mitochondria (respiration), we are now moving on to another cell organelle: the nucleus .
Some questions to start us off…take a moment to try to answer #1-4 with your table partner How High?! JUMP! It’s the Control Center of the Cell- directs all cells activity Think back to the cell/the city What is the job of the Nucleus?
What’s in the nucleus? THE NUCLEOLUS So then we can say that the Nucleus makes proteins Let’s take a deeper look And what is the job of the nucleolus? To make ribosomes And what do ribosomes do for the cell? They make protein!
The sequencing of the nucleotide bases determines the information that is needed to make proteins.
The combinations of nucleotides is an actual code (message) for different amino acids.
Do you remember? What are amino acids?
Now that you know all about DNA…you need to figure out how it does its job! ALL CELLS CONTINUALLY DIVIDE WHEN THEY DO, THE DNA REPLICATES (COPIES ITSELF) SO THAT EACH NEW CELL HAS A SET OF INSTRUCTIONS ON HOW TO RUN THE CELLS ACTIVITIES Without the DNA, the cell would not be able to function!
So, How does DNA Replicate? YOU TELL ME! JOURNAL TITLE “DNA REPLICATION” (after a bit of cutting and learning on your own please write out the answers to the questions on page 3 of your packet. Then write a journal entry describing the detailed process of DNA replication ) DNA SNIPPING ACTIVITY
In the dentist’s office, why do they place a lead apron over a person’s lap? They want to protect the reproductive organs. If a mutation occurs in the reproductive organs, it may end up disfiguring a future child, or worse.
Cancer is a disease where cells begin to divide by mitosis uncontrollably. A mutation(s) can occur in one single cell, and by the process of mitosis it can grow into tens of thousands or more cells in a relatively short period of time.
What forms when a cell has undergone mitosis uncontrollably for a while in one central spot? A Tumor
Cancer Treatments 1. Surgerical removal of cancer
2. Chemotherapy- Treatment with drugs that kill cancer cells or make them less active. 3. Radiation- uses high-energy waves, such as X-rays (invisible waves that can pass through most parts of the body), to damage and destroy cancer cells.
4. Another option is a STEM CELL TRANPLANT Radiation and anti-cancer drugs are very good at destroying cancer cells, but unfortunately they also destroy healthy cells. http://www.leapingmedia.com/Media/TransplantAnimation.mov
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PROTEIN SYNTHESIS SUMMARY STEP 1: Transcription WHERE: In the nucleus WHAT: RNA polymerase does its jobs: Splits DNA strand. RNA copies recipe from DNA strand. DNA strand zips up again. mRNA now newly formed prepares to leave the nucleus. STEP 2: Translation WHERE: On the ribosome WHAT: mRNA sits on ribosome with its codons exposed. tRNA anticodons match with the codons bringing with them amino acids. Amino acids link. tRNA go away. Amino acid chain (aka polypeptides) forms protein.