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Chap 1
Terminology
19
Biology
Undergraduate 1
08/28/2015

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Term
What does it mean to be alive?
Definition
Organisms share the characteristics of energy, cells, information processing, replication, and evolution
Term
What is the cell theory?
Definition
The cell theory states that all organisms are made of cells, and all cells come from preexisting cells.
Term
hypothesis
Definition
a testable statement to explain a phenomenon or a set of observations
Term
What is evolution?
Definition
a change in the characteristics of a population over time
Term
natural selection
Definition
individuals within a population that pass heritable traits to offspring that make them more better suited to face their environment
Term
fitness
Definition
the ability of an individual to produce viable offspring
Term
adaptation
Definition
a trait that increases the fitness of an individual in a particular invironment
Term
speciation
Definition
natural selection has caused populations of one species to diverge and form new species
Term
tree of life
Definition
a family tree of all organisms and all species trace their ancestry back to a single common ancestor
Term
rRNA
Definition
ribonucleotides- a sequence that is the coded to created all organisms and show their similarities and differences
Term
What are the 3 fundamental groups or lineage of organisms?
Definition
1) Bacteria 2) Archaea 3) Eukarya
Term
eukaryotes
Definition
cells have a prominent component called the nucleus
Term
prokaryotes
Definition
cells that lack a nucleus (bacteria and archael cells)
Term
taxonomy
Definition
the effort to name and classify organisms
Term
taxon
Definition
a named group
Term
The 3 domains of life?
Definition
Bacteria, Archaea, and Eukarya
Term
Scientific (Latin) Names
Definition
Developed by Carolus Linnaeus for naming species. Genus is the 1st part and Species is the 2nd part of the name. Always italicized.
Term
What are the 2 theories of why giraffes have long necks?
Definition
1) Food competition hypothesis states they can reach higher food in times of droughts.
2) Sexual Competition hypothesis states their long necks make them better fighters for females.
Term
null hypothesis
Definition
specifies what should be observed when the hypothesis being tested isn't correct
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