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Transcript of Cells
Biology
Characteristics of Living Things
Reproduction
Growth
Characteristics of Living ThingsDevelopment
Energy Capture
Characteristics of Living Things
Energy UtilizationResponse to Stimuli
Characteristics of Living Things
Composed of Cells
Adaptation
Basic BiochemistryTextbook Chapter 3 (Sections 1 and 3)
Biochemistry Atom: single unit,
found on periodic table
Molecule: combination of multiple atoms via bonds
Element (atoms) vs. Compound (molecules)
Cells
Levels of Organization “SMALLER” LEVELS
Cells Tissues* Organs Organ Systems Organisms
“LARGER” LEVELS
Organisms Populations* Communities* Ecosystems Biosphere
“Cell” Theory1. All living things are made of cells.
2. Cells are the basic units of structure and function within organisms.
3. All cells are derived from other cells.
Macromolecules
4 Essential Macromolecules All carbon-based
because…
Smaller molecules LINKED to form chains, called “polymers”
Important in nutrition
1.) CARBOHYDRATES Structure: single sugars (carbon rings)
which can be joined
Monosaccharides (1), Disaccharides (2), Polysaccharides (many)
1.) CARBOHYDRATES Primary energy source
(utilized first)
Cell-recognition
Structural support (chitin and cellulose)
Examples in foods: starches, sugars, bread, and fruit
2.) LIPIDS Structure: long carbon/hydrogen chains
Fats, waxes, oils
One use: long-term energy storage
2.) LIPIDS Often insoluble (barrier to water) because
hydrocarbon chains are “hydrophobic”
What things are made out of lipids?
3.) PROTEINS Structure: small AMINO
ACIDS linked into long chains
20 different amino acids
Function of a protein related to order of AAs
3.) PROTEINS Structural building blocks of cells (tissue, bones, skin, muscles)
Extremely complicated structures,
Also called“polypeptides”
4.) NUCLEIC ACIDS DNA carries genetic information
Structure: small “nucleotides” linked together
Order of four different nucleotides creates the “code” found in DNA
ATP: energy currency in cells
Topics Covered: Week 1 Characteristics of living things
(1.4) Cell theory (7.1) Basic chemistry (3.1, 3.2) Levels of organization (7.3) Four macromolecules (3.3)
Water Interactions
Cell Environment Primarily water
Molecules are dissolved / suspended
Types of Solute (Solute = dissolved
particles)
HYDROPHILIC (usually have pos. or neg. charge)
HYDROPHOBIC (usually uncharged)
Cells
Cell Size/Shape Varies based on type of
cell
Ex. Neurons are thin, but can be nearly a meter
Size scale: micrometers (μm)
Why are cells so small? A small volume (size)
requires fewer nutrients
A larger surface area allows a cell to transport more across the cell membrane
Surface Area-To-Volume Ratio Most efficient cells
have small volumes and large surface areas
A large surface area-to-volume ratio is best
Surface Area-To-Volume Ratio The larger the cell, the smaller the SA-V ratio
Diameter of cube:
Surface area:
Volume:
Ratio:
Surface Area-To-Volume Ratio The larger the cell, the smaller the SA-V ratio
Diameter of cube: 1 μm
Surface area: 6 μm2
Volume: 1 μm3
Ratio: 6.0
Surface Area-To-Volume Ratio The larger the cell, the smaller the SA-V ratio
Diameter of cube: 1 μm 2 μm
Surface area: 6 μm2 24 μm2
Volume: 1 μm3 8 μm3
Ratio: 6.0 3.0
Surface Area-To-Volume Ratio The larger the cell, the smaller the SA-V ratio
Diameter of cube: 1 μm 2 μm 3 μm
Surface area: 6 μm2 24 μm2 54 μm2
Volume: 1 μm3 8 μm3 27 μm3
Ratio: 6.0 3.0 2.0
Surface Area-To-Volume Ratio The larger the cell, the smaller the SA-V ratio
Diameter of cube: 1 μm 2 μm 3 μm 4 μm
Surface area: 6 μm2 24 μm2 54 μm2 96 μm2
Volume: 1 μm3 8 μm3 27 μm3 64 μm3
Ratio: 6.0 3.0 2.0 1.5
Surface Area-To-Volume Ratio The larger the cell, the smaller the SA-V ratio
Diameter of cube: 1 μm 2 μm 3 μm 4 μm 5 μm
Surface area: 6 μm2 24 μm2 54 μm2 96 μm2 150 μm2
Volume: 1 μm3 8 μm3 27 μm3 64 μm3 125 μm3
Ratio: 6.0 3.0 2.0 1.5 1.2
Surface Area-To-Volume Ratio By increasing surface area with
folds, cells can be more efficient
PROKARYOTIC CELLS Bacteria
First organisms on Earth
No nucleus. Few cell structures.
EUKARYOTIC CELLS Part of multi-celled
organisms
More specialized
Nucleus and membrane-bound organelles
What Cells Do… All the functions that
allow an organism to survive
Including: respiration, growth, reproduction, energy utilization, etc.
Cell Membrane Outer covering of all
cells Gives cell its shape Controls what enters
and exits the cell Made up of lipids
(hydrophobic)
Nucleus “Brain” of the cell Controls all functions Contains DNA
(chromosomes) Surrounded by a
NUCLEAR MEMBRANE that is similar to the cell membrane
Cytoplasm Watery, jelly-like material that
contains dissolved solutes, nutrients, etc.
Located in-between cell membrane and nucleus
Surrounds most other cell parts
Ribosomes Made of protein & RNA
Structures in which proteins are made
Some proteins kept, others exported by Endoplasmic Reticulum
Mitochondria Small, rod-like
structures “Powerhouse” of the
cell Extract energy from
food and makes ATP
What kind of cells have the most?
Vacuoles Storage sacs
within cells Can store: food,
water, minerals, waste, or toxins
MUCH larger within plant cells (keeps plant rigid)
Lysosomes Sacs containing digestive enzymes
Specialized Organelles
Only In Plant Cells: Chloroplasts (and chlorophyll) Cell Wall
Cell Wall Surrounds and
supports plant cells (and some fungi, bacteria, and algae)
Made of cellulose (most abundant biological molecule in nature)
Chloroplast Structure in which plant
cells create sugars
Contain chlorophyll (green) which captures sunlight
Sugars made in chloroplasts are used in mitochondria as energy