objective: you will be able to differentiate between living and nonliving things
DESCRIPTION
Objective: You will be able to differentiate between living and nonliving things. Do Now: Open your notebook to the inside cover Write the following: Living Environment midterm: Tuesday, January 24 th @ 10:53 May need to take the morning bus!. Life. Characteristics. - PowerPoint PPT PresentationTRANSCRIPT
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Objective: You will be able to differentiate
between living and nonliving things.
Do Now:– Open your notebook to the inside cover– Write the following:
• Living Environment midterm: Tuesday, January 24th @ 10:53• May need to take the morning bus!
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Characteristics of living things
• All living things must perform certain functions to stay alive
• Non living things do not do all of these
• What activities can you think of?
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Life Functions• Nutrition
• Obtain and breakdown nutrients
• Cell Respiration• Breakdown food to release energy
• Transport• Moving things throughout itself
• Synthesis• Combine simple substances
• Growth• Reproduce• Regulation
• Respond to the environment
• Excretion• Ridding itself of waste
• Response• React to internal or external stimuli
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Life Characteristics
• Homeostasis• Maintain a stable internal environment
• Metabolism• All of the chemical reactions in the organism
• Cells• All organisms are made up of at least one cell
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Living things and cells
• All living things are made up of one or more cells
• Cells are the functional unit of living things
• Some organisms have only one cell and are called unicellular
• Some are even made up of trillions of cells
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Do you smell what the Rock’s
cooking?
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Organization levels
• Biologists break life down into different levels
– This makes it easier to study life
• The order from smallest to largest– Cells, tissues, organs, organ systems and
organism
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Cells make up living things
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Tissues are groups of cells that work together
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Organs are made of tissues working together
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Organ systems are made of organs that work together
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Organism is made of a group of organ systems working together
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Objective: You will be able to give the function of each cell organelle.
Do Now:• Read, “Nucleus” on p. 176
• What is chromatin made of?
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Objective: You will be able to connect life functions to one or more cell organelles.
Do Now:• Begin filling the function of any organelle you
can remember
• Circle the three that are the most difficult for you to remember
• Place a star next to the organelle that you think is the most important
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Activity
• Look through your definitions for life functions.
• List a life function and the organelle(s) that best match up with that life function
• Write a sentence why the two go together• Ex. Transport -
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Differences Between Animal and Plant Cells
• Animal cells are round and plant cells are rectangular
• Animal cells have lysosomes and centrioles
• Animal cells have small vacuoles and plant cells have one large vacuole
• Plant cells have chloroplasts and a cell wall
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Cork Cells
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Human Cheek Cells
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Onion Cells Nucleus
Nucleolus
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Elodea Cell
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Blood Cells
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Objective: You will be able to differentiate between passive and active transport.
Do Now:
List two differences between active and passive transport
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Outsideof cell
Insideof cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel Lipid bilayer
Carbohydratechains
Section 7-3
Figure 7-12 The Structure of the Cell Membrane
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Molecule tobe carried
Moleculebeing carried
Energy
Section 7-3
Figure 7-19 Active Transport
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Figure 8.10 The diffusion of solutes across membranes
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Section 7-3
Figure 7-15 Osmosis
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Figure 8.17 An electrogenic pump
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Figure 8.15 The sodium-potassium pump: a specific case of active transport
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Receptor
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Objective: You will be able to compare and contrast the photosynthesis and respiration equations.
Do Now:• Write the equations for both respiration and
photosynthesis.– In a sentence write what happens to oxygen in each
equation.– In a sentence write what happens to carbon dioxide in
each equation.
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Photosynthesis Equation
6CO2 + 6H2O C6H12O6 + 6O2
Carbon + Water Glucose + Oxygen
Dioxide
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Respiration Equation
C6H12O6 + 6O2 6CO2 + 6H2O + ATP
How can you remember the equation for respiration?
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Chloroplasts
Chloroplasts is the site of photosynthesis
– Take in CO2 and Water to make glucose
– Has green pigment called chlorophyll to capture sunlight
– Gives of Oxygen as a waste
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VS.
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Chloroplasts: The Sites of Photosynthesis
Chloroplast
Mesophyll
5 µm
Outermembrane
Intermembranespace
Innermembrane
Thylakoidspace
Thylakoid
GranumStroma
1 µm
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Global Warming
• Is partly caused by an increase of CO2 in the air?
• Why would cutting down a forest and leaving the trees to rot increase the effect of global warming?
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Objective: You will be able to describe the structure
and function of carbohydrates
Do Now:Read “Macromolecules” on p.
45Differentiate between
monomers and polymers
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Inorganic versus Organic
compounds
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6
CCarbon
Section 2-1
An Element in the Periodic Table
H1
Hydrogen+
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Types of Organic CompoundsCarbohydrates
Lipids
Proteins
Nucleic Acids
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Figure 5.2 The synthesis and breakdown of polymers
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Functions
–Readily available source of energy
–Energy storage
–Strong building materials
Carbohydrates
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Starch
Glucose
Section 2-3
Figure 2-13 A Starch
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Figure 5.5 Examples of disaccharide synthesis
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Figure 5.6 Storage polysaccharides
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Benedicts tests for Monosaccharides like
Glucose
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Iodine tests for Polysaccharides like
starch
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Lipids have several functions:
Long term energy storageMake up cell membranes
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Structure of LipidsConsists of one glycerol and
three fatty acids
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Figure 5.10 The synthesis and structure of a fat, or triacylglycerol
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Protein Functions
• Enzymes
• Hormones
• Makes up muscle tissue
• Transport materials
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Protein Structure
• Made up of amino acids– Proteins have 1000’s of amino acids joined
together– But there are only 20 different amino acids– The order you place them determine what protein
you make
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Enzymes• Catalysts can speed up or slow down a
reaction
• Organic catalysts are called enzymes.
• Why do we refer to enzymes as being organic?
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Enzymes• Enzymes are a type of protein.
• End in -ase
• What do we call the small units that we put together to make proteins?
• An enzyme is usually used to make a chemical reaction go faster
• The enzyme does not get used up during the reaction so that it can be reused again and again.
• Why do you think it is an advantage of the cell to be able to reuse enzymes?
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Enzymes
• Enzymes work on molecules called substrates
• The substrate actually fits into a spot on the enzyme called the active site
• Each enzyme has a VERY specific shape to their active site
• Usually only one substrate can fit into the active site of a specific enzyme
• Why do you think that scientists refer to enzymes as being specific?
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Substrates
Products
Enzyme
Enzyme-substratecomplex
1 Substrates enter active site; enzymechanges shape so its active siteembraces the substrates (induced fit).
2 Substrates held inactive site by weakinteractions, such ashydrogen bonds andionic bonds.
3 Active site (and R groups ofits amino acids) can lower EA
and speed up a reaction by• acting as a template for substrate orientation,• stressing the substrates and stabilizing the transition state,• providing a favorable microenvironment,• participating directly in the catalytic reaction.
4 Substrates are Converted intoProducts.
5 Products areReleased.
6 Active siteIs available fortwo new substrateMole.
Figure 8.17
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What can affect Enzymes doing their jobs?
• Temperature
• pH
• These two factors affect enzymes because they change its shape
• The substrate will not fit into the active site anymore
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Figure 8.16a
Optimal temperature fortypical human enzyme (37°C)
Optimal temperature forenzyme of thermophilic
(heat-tolerant)bacteria (77°C)
Temperature (°C)(a) Optimal temperature for two enzymes
Rat
e o
f re
acti
on
120100806040200
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Figure 8.16b
Rat
e o
f re
acti
on
0 1 2 3 4 5 6 7 8 9 10pH
(b) Optimal pH for two enzymes
Optimal pH for pepsin(stomachenzyme)
Optimal pH for trypsin(intestinal
enzyme)
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Objective: You will be able to design a scientific
experiment.
Do Now:• Read “Explaining and Interpreting Evidence” on
p. 5
• Define Hypothesis
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Scientific Experiments
• State a problem
• Provide a hypothesis
• Identify:– Independent variable– Dependent variable
• Control set up
• Give a conclusion
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Example• Problem
– Will a plant grow more in saltier water
• Hypothesis– A lower salt concentration will make the plant
grow taller
• Independent variable is the salt concentration
• Dependent variable is how tall the plants grow
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Pair Work
• Design an experiment to show which color of light works best for photosynthesis.
• Go through the steps in the previous slide
• Each person needs to complete this in their notebook
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Objective: You will be able to design a scientific
experiment.
Do Now:• Take the ditto at the back table
• Answer the questions individually
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Now we are going to do a real experiment.• Which paper towel absorbs water the
best?– Choices:
• Bounty• Brown generic towels• White school towels
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Towel experiment
• Take out a new piece of paper. This will count as one of the labs you need to sit for the Regents.
• Write your name at the top
• Underneath your name, write the following lab title “Paper Towel Absorbency”
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Your Name
“Paper Towel Absorbency”
Purpose:
Materials: