Vocab Flashcards
Organism
Anything that has had all these characteristics: Made of one or more cells Displays organization Grows and develops Reproduces Responds to stimuli Requires energy Maintains homeostasis Adaptations evolve over time
Organization
Cells arranged in an orderly way
Growth
Addition of mass to an organism, and formation of new cells and structures
Development
Process of natural changes that take place during the life of an organism
Reproduction
Production of offspring
Species
Group of organisms that can breed with another organism and produce fertile offspring.
Stimulus
Part of the environment that causes any reaction
Response
Reaction to a stimulus
Homeostasis
Regulation of an organisms internal conditions to maintain life
Biology
Study of life
Adaptation
Any inherited characteristic which results from changes to a species over time
Science
Body of knowledge based on the study of nature
Theory
Explanation of a natural phenomenon supported by observations and experiments
Peer Review
Process in which the procedures and results of an experiment are evaluated by other scientists in the same field
Metric System
Units with divisions of powers of ten
SI
International System of Units
Forensics
Applies science to legal intrest
Ethics
Set of moral principles or values
Observation
Direct method of gathering information in an orderly way
Inferences
Process of combining what is known, with what is learned, to draw logical conclusions
Scientific Method
Question Hypothesis Experiment Observe and record data Conclusion Apply
Hypothesis
Testable explanation of a situation
Serendipity
Occurrence of accidental or unexpected but fortunate results
Experiment
Investigation of a phenomenon in a controlled setting to test a hypothesis
Control Group
Group used for comparison
Experimental Group
Group being tested
Independent Variable
Tested factor that could affect the outcome of the experiment
Dependent Variable
Depends on the independent variable
Constant
The factor that doesn’t change; remains fixed; the same
Data
Information gained from observations
Safety Symbol
Logo designed to alert about specific danger
Atoms
Building blocks of matter
Nucleus
Center of atom: where protons and neutrons are located
Protons
Positively charged particles
Electrons
Negatively charged particles located outside the nucleus
Element
Pure substance that can’t be broken down by physical or chemical means
Isotopes
Atoms of the same element with different numbers of neutrons
Compound
Pure substance formed with the combining of two or more different elements
Covalent Bond
Sharing of two electrons
Ionic Bond
Electrical attraction between two oppositely charged atoms
Molecule
Compounds in which the atoms are covalently held together
Ion
The loss or gain of electrons which carries an electric charge
van der Waals forces
Attractive forces between positive and negative regions which pull on the molecules and hold them together; named after Dutch physicist Johannes van der Waals who first described the phenomenon
Chemical Reaction
When a substance changes form; atoms are reorganized into different substances
Reactants
Original substances
Products
Outcome, or the substances formed from the reactants during the reaction
Activation Energy
The minimum amount of energy needed for reactants to form products in a chemical reaction
Catalyst
Substance that lowers the activation energy needed to start a chemical reaction
Enzymes
Biological catalyst that speed up the rate of chemical reactions in biological processes
Substrates
Reactants that bind to the enzyme
Active Site
The location where the substrate binds to the enzyme
Polar Molecules
Oppositely charged regions
Hydrogen Bond
Weak interaction involving hydrogen atoms, fluorine, oxygen, or a nitrogen atom
Mixture
Heterogeneous mixture; combination of two or more substances in which each substance maintains it’s characteristics and properties; don’t mix
Solution
Homogeneous mixture; mix well
Solvent
Substance doing the dissolving
Solute
Substance that is dissolved in the solvent
Acids
Substances that release hydrogen atoms; base of below 7
Bases
Substances that release hydroxide ions; base of higher than 7
pH
The measure of concentration of H+ in a solution
Buffers
Mixtures that can react with acids or bases to keep the pH withing a certain range
Macromolecules
Large molecules formed by the joining of smaller organic molecules
Polymers
Molecules made from repeating units of identical or nearly identical compounds called monomers linked together by covalent bonds
Carbohydrate
Compounds composed of carbon, hydrogen, and oxygen; ratio of 1 oxygen and 2 hydrogen atoms for each carbon atom
Lipids
Molecules made of carbon and hydrogen that make up fats, oils, and waxes
Protein
Compound made of small carbon compounds called amino acids
Amino Acids
Small compounds that are made of carbon, nitrogen, oxygen, hydrogen, and sometimes sulfur; share the same general stucture
Nucleic Acids
Complex macromolecules that store and transmit genetic information
Nucleotides
Smaller repeating subunits composed of carbon, nitrogen, oxygen, phosphorous and hydrogen atoms making up Nucleic acids
Cell
Make up all living organisms
Cell Theory
- All living organisms are composed of one or more cells
- Cells make up all living things
- Cells arise from only preexisting cells, with cells passing copies of their genetic material on to their daughter cells
Plasma Membrane
Special boundary that helps control what enters and leaves the cell
Organelles
Specialized structures that carry out specific funtions
Eukaryotic Cells
Contain a nucleus and other organelles that are bound by membranes; AKA membrane bound organelles
Cell Nucleus
Distinct central organelle that contains the DNA of the cell
Prokaryotic Cells
Cells without a nucleus or other membrane bound organelles
Selective Permeability
Membrane allows some certain substances to pass through but keeping others out
Phospholipid Bilayer
2 layers of phospholipids are arranged tail to tail
Transport Proteins
Move needed substances or waste materials through the plasma membrane which contribute to selective permeability
Fluid Mosaic Model
When the phospholipids in the bilayer create a “sea” in which all other molecules can float
Cytoplasm
Environment inside the plasma membrane
Cytoskeleton
Supporting network of protein fibers that form a framework for the cell and act as an anchor for the organelles inside the cells
Ribosomes
Organelles that help manufacture proteins
Nucleolus
Site of ribosome production located in the nucleus
(ER) Endoplasmic Reticulum
Membrane system of folded sacs and interconnected channels that serve as the site for protein and lipid synthesis
Golgi Apparatus
Flattened stack of membranes that modifies, sorts, and packages proteins into sacs called vesicles
Vacuole
Sac used to store food, enzymes, and other materials needed by a cell