Science Guide to 7th Grade
Essay by Sam Huppert • November 9, 2017 • Exam • 1,160 Words (5 Pages) • 843 Views
Page 1 of 5
Chapter 1
Section 1: discovering cells
- Cells are the basic units of structure in a living thing.
- Cells were first discovered by Robert Hooke who used a microscope on cork and found dead cells.
- The transmission is the strongest microscope besides for the tunneling.
- the transmission uses electrons.
- Schleiden said all plants were made of cells.
- Schwann said all animals were made from cells.
- Virchow said all living things are composed from cells.
- virchow said all cells made from other cells.
- ^^^^These statements were gathered and made the cell theory.
- 2 or more
[pic 1]
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ is a diagram of a microscope remember these parts !!
Section 2:Looking in cells
- Animal cells have centrioles and lysosomes
[pic 2][pic 3][pic 4]
- Plant cells have chloroplast and a bigger vacuole and starch grains and cell wall
- They both have E.R., Mitochondria, Nucleus, Nucleolus, golgi body, Ribosomes, cytoplasm, and Membrane
- Cytoplasm is the filling of the cell
- E.R. transports proteins (hallways)
- Membrane controls what goes in and out it is phospholipid bilayer
- Cell walls ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ more
- bacteria, fungus also have cell walls
- most of the cells we have are specialized
- Mitochondria power the cell through breaking glucose the have double membrane makes ATP
- Chloroplast capture solar energy (only in plant cells)
- Nucleus has chromatin (DNA) which is basically the blueprint on how to run the cell it has pores (holes) that connect to E.R..
- vacuole = storage tank basically Vacuole holds stuff
- plant cell has big vacuole
- animal cell has multiple
- lysosomes = garbage dep. Lysosome breaks down stuff using enzymes
- Chromatin can condense to chromosomes that play a role in mitosis and meiosis
- Nucleolus makes ribosomes nucleolus inside nucleus
- Golgi Body package materials and sends them (amazon)
- Lysosome breaks down stuff using enzymes
- centrioles play a big role in cell division
- Ribosomes make proteins
- bars = cell wall / screen = membrane (brooklyn windows)
Section 3:Chemical Compounds in cells
- lipids = fats oils (C,H,o)
- carbohydrates =sugar ( C,H,O)
- proteins = meats chicken made of amino acids (C,H,O,N,S)
- Nucleic acids = DNA + RNA
- amino acids = smaller pieces that come together to make proteins
- know periodic tables in your notes
- carbon = key element for all organic compounds
- hydrogen in all organic compounds vital for life
- nitrogen critical for proteins + nucleic acids
- sodium important for water balance in cells and organisms
- Oxygen we need for respiration needed for life
- Potassium Is important for water balance in cells and organisms
- Chlorine Water balance + other stuff
- Sulfur in amino acids and thus some proteins
- Phosphorus part of cell membrane ATP needed for bones
- elements cannot be broken down anymore made by atoms
- compounds made by molecules
Section 4:The Cell in Its Environment
- Diffusion is when the molecules spread due to more in one area then another area
- Osmosis is when water molecules move from an area of high concentration to an area of lower concentration it does not require energy
- passive transport does not require energy osmosis and diffusion also does not
- Active transport is using energy Engulfing uses energy (endocytosis) transport proteins use energy too
- endocytosis = engulfing
- exocytosis looks like an acne commercial
Chapter 2:Cell processes and energy
Section 1:Photosynthesis with accel.
- autotroph make food heterotroph kills things and eats them
- pigments are colored chemicals that capture energy
- chloroplast is a pigment
- Carbon dioxide enters the plant through the stomata
- carotenoids xanthophylls and anthocyanins are pigments
- ribosomes are in chloroplasts
- In the chloroplasts the light reactions occur in the thylakoid membranes
- A plant needs CO2 H2O and RAYS FROM SUN
- The calvin cycle is the dark reactions that occur in the stroma
- magnesium is in chlorophyll
- Photosynthesis
- 6CO2+ 6H2O-------->C6H12O6+O6
- from one glucose molecule 30 to 38 atp are produced from resp.
Section 2: Respiration and accel
- Glycolysis occurs in cytoplasm it breaks down glucose
- Krebs cycle breaks down glucose even more
- It has a folded membrane called the cristae it is where electron transport occurs
- In both photo. and resp. electron transport occurs to slowly release energy
- The krebs cycle occurs in matrix
- Plants use photosynthesis and respiration animals just use resp.
- Fermentation does not use oxygen lactic acid fermentation: happens in the making of beer and bread alcoholic fermentation:happens in us when we run out of oxygen due to hard running
- from one glucose molecule 30 to 38 atp are produced from resp.
- Ethyl alcohol is produced in alcoholic fermentation
- chemosynthesis is used instead of photosynthesis in deep sea vents by unusual bacteria
Section 3: Cell division
- Interphase is when a cell grows and copies its dna to prepare for cell division
- in prophase the cell condenses chromatin to form chromosomes
- in metaphase the chromosomes line up across the center of the cell
- Anaphase is when the centromeres split
- telophase nuclear envelope forms around the chromosomes
- Cytokinesis is when the membrane pinches each cell ends up with identical DNA
Chapter 3:genetics and heredity
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