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Bio 21
PPT 1
29
Biology
Undergraduate 1
08/30/2008

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Term
Bio
Definition
of living things
Term
What are common characteristics of living things
Definition
Properties of life
order, energy processing, regulation, growth and development, reproduction, response to environment, evolutionary adaptation
Term
Prokaryotic
Definition
-Archaea and bacteria
-few internal membranes
-no membrane-bound nucleus
Term
Eukaryotic
Definition
-Protists, Fungi, Animals, Plants
-extensive internal membranes
-membrane-bound nucleus
Term
Energy
Definition
ability to do work
Term
Energy conversion
Definition
change of one form of energy to another
Term
Metabolism
Definition
sum of chemical reactions in an organism
Term
Heterotrophic
Definition
other feeder, taking in organic molecules produced by other organisms
Term
Autotrophic
Definition
self-feeder
Term
photosynthesis
Definition
using the energy of the sun to produce organic molecules
Term
DNA
Definition
deoxyribonucleic acid (the molecules of heredity)
Term
Mitosis
Definition
nuclear division retaining the original chromosome
Term
Meiosis
Definition
nuclear division reducing the chromosome number, leading to sperm or eggs
Term
Growth
Definition
increase in size
Term
Development
Definition
change in characteristics
Term
Homeostasis
Definition
The steady state physiological condition of the body (living things maintain homeostasis=a relatively stable internal condition)
Term
Darwins Theory of evolution
1. descent with modification
Definition
current species arose from a succession of ancestors
Term
Darwin's Theory of evolution
2. Natural Selection
Definition
individuals with traits that provides an advantage in the current environment are more likely to survive and reproduce.
Term
Adaptation
Definition
characteristic that promotes surival and reproduction
Term
Observations
Definition
objective notations of phenomenon
Term
Hypothesis (this is a Bio21 definition)
Definition
-Two measurable variables
-Precise relationship between them
(relationship=prediction)
Term
How do Biologists study living things?
Definition
Testing hypotheses in a controlled experiment.
Term
Experimental
Definition
sample treated to test for effect of the factor being studied
Term
control
Definition
sample treated like experimental in all ways EXCEPT for factor being studied
Term
controlled experiment
Definition
test designed to determine the effect of one factor while keeping all other factors constant
Term
testable hypothesis
Definition
-experiments can be designed to test predications from the hypothesis
-experimental results must be repeatable
Term
Falsifiable
Definition
-allows scientists to eliminate alternative hypotheses
Term
Theory
Definition
hypothesis supported by repeated testing
Term
Principle or law
Definition
theory that has been supported over a long period of time
-cell principle
-principle of evolution
-principle of emergent properties
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