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AP Biology Notecards: Chapters 26-27
Chapters 26 & 27's notecards from "Biology: Sixth Edition" by Campbell & Reece.
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Biology
12th Grade
02/05/2012

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Term
Snowball Earth
Definition
The hypothesis that glaciers covered the planet's land masses from pole to pole 750 to 570 million years ago.
Term
Pangaea
Definition
The supercontinent formed near the end of the Paleozoic era when plate movements brought all the landmasses of Earth together.
Term
Spontaneous Generation
Definition
Te incorrect notion that life can emerge from inanimate material.
Term
Domain
Definition
A taxonomic category above the kingdom level. The three domains are Archaea, Bacteria, and Eukarya.
Term
Kingdom
Definition
A taxonomic category, the second broadest after Domain.
Term
Phylogeny
Definition
The evolutionary history of a species or group of related species.
Term
Universal Ancestor
Definition
The most recent organism from which all organisms now living on Earth descend. Thus it is the most recent common ancestor of all current life on Earth.
Term
Prokaryote
Definition
A type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles. A eukaryote has a nucleus and organelles.
Term
Peptidoglycan
Definition
A type of polymer in bacterial cell walls consisting of modified sugars cross-linked by short polypeptides.
Term
Capsule
Definition
A sticky layer that surrounds the cell walls of some bacteria, protecting the cell surface and sometimes helping to glue the cell to surfaces.
Term
Motile
Definition
Capable of movement.
Term
Taxis
Definition
Movement toward or away from a stimulus.
Term
Endospore
Definition
A thick-coated, resistant cell produced within a bacterial cell exposed to harsh conditions.
Term
Photoautotroph
Definition
An organism that harnesses light energy to drive the synthesis of organic compounds from carbon dioxide.
Term
Chemoautotroph
Definition
An organism that needs only carbon dioxide as a carbon source but that obtains energy by oxidizing inorganic substances.
Term
Photoheterotroph
Definition
An organism that uses light to generate ATP but that must obtain carbon in organic form.
Term
Chemoheterotroph
Definition
An organism that most consume organic molecules for both energy and carbon.
Term
Saprobe
Definition
An organism that acts as a decomposer by absorbing nutrients from dead organic matter.
Term
Parasite
Definition
An organism that absorbs nutrients from the body fluids of living hosts.
Term
Nitrogen Fixation
Definition
The assimilation of atmospheric nitrogen by certain prokaryotes into nitrogenous compounds that can be directly used by plants.
Term
Obligate Aerobe
Definition
An organism that requires oxygen for cellular respiration and cannot live without it.
Term
Facultative Anaerobe
Definition
An organism that makes ATP by aerobic respiration of oxygen is present but that switches to fermentation under anaerobic conditions.
Term
Obligate Anaerobe
Definition
An organism that cannot use oxygen and is poisoned by it.
Term
Extremeophile
Definition
A microorganism that lives in extreme environments It is further classified as either mathanogens, extreme halophiles, or extreme thermophiles.
Term
Methanogen
Definition
A microorganism that obtains energy by using carbon dioxide to oxidize hydrogen, producing methane as a waste product
Term
Extreme Halophile
Definition
A microorganism that lives in unusually highly saline environments, such as the Great Salt Lake or the Dead Sea.
Term
Extreme Thermophile
Definition
Microorganisms that thrive in hot environments (often 60-80C).
Term
Symbiosis
Definition
An ecological relationship between organisms of two different species that live together in direct contact.
Term
Exotoxin
Definition
A toxic protein secreted by a bacterial cell that produces specific symptoms even in the absence of the bacterium.
Term
Endotoxin
Definition
A component of the outer membranes of certain gram-negative bacteria responsible for generalized symptoms of fever and ache.
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