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LIFE 102 - Exam 2
Biology flashcards for the second exam in LIFE 102; based off of previous tests
61
Biology
Undergraduate 1
10/06/2012

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Term
ethanol or ethyl alcohol
Definition
Under aerobic conditions, yeast does not produce
Term
Aerobic respiration
Definition
Most ATP in cells is produced during this process
Term
Cytoplasm
Definition
where glycolysis occurs
Term
Thylakoids
Definition
where chlorophyll and other pigments involved in photosynthesis are located
Term
Photorespiration
Definition
involves the same enzyme, ribulose-biphosphate carboxylase (Rubisco) of Calvin cycle
Term
Phosphoenol pyruvate (PEP)
Definition
CO2 in mesophyll cells of C4 plants condense with this to make a four carbon product
Term
C3 Plant
Definition
Calvin cycle in mesophyll cells
Term
CAM plant
Definition
Calvin cycle during day time
Term
C4 plant
Definition
Calvin cycle in Bundle sheath cells
Term
Competitive enzyme inhibitor
Definition
appears structurally similar to the substrate and blocks access to active site
Term
Buffers
Definition
substances that maintain pH
Term
Fermentation
Definition
in yeast, results in production of alcohol
Term
Enzyme
Definition
has an active site, substrate specific, binds to a substrate, and lowers activation energy, and is not used up in a reaction
Term
Allosteric enzyme
Definition
oscillates between inactive and active state because of conformation change at a site other than the active site
Term
catabolic reactions
Definition
reactions involved in the break down of organic chemicals
Term
endergonic reactions
Definition
reactions that consumes energy/heat
Term
anabolic reactions
Definition
reactions in biosynthesis of biochemicals
Term
exergonic reactions
Definition
reactions that release heat/energy, thetaG < 0
Term
metabolic reactions
Definition
sum total of all biological reactions
Term
CO2 fixation
Definition
found in Calvin cycle
Term
H20 to NADPH -> Calvin Cycle
Definition
the flow of electrons in photosynthesis
Term
Photosystem
Definition
contains light harvesting antenna and reaction center
Term
Chemiosmosis
Definition
causes generation of ATP from ADP
Term
Oxidative phosphorylation
Definition
where most ATP is generated during cellular respiration
Term
Ribulose biphosphate carboxylase
Definition
most abundant protein in biosphere
Term
sunlight
Definition
where all life forms on Earth derive energy from
Term
Glycolysis
Definition
metabolic pathway common to fermentation and cellular respiration, net gain of two ATP and two NADH
Term
Autotrophs
Definition
can nourish themselves beginning with CO2 and other inorganic chemicals
Term
Heterotrophs
Definition
feed off others
Term
Photophosphorylation
Definition
involves generation of ATP from sunlight, similar to oxidative phosphorylation in cellular respiration
Term
Oxaloacetates
Definition
recycled in Krebs cycle
Term
ATP
Definition
immediate energy source in a cell that drives reactions
Term
Primary electron acceptor
Definition
captures energized (excited) electrons from photosystem
Term
Smooth endoplasmic reticulum
Definition
functions in detoxification, membrane synthesis, steroid synthesis, and calcium ion storage and released
Term
Food vacuoles
Definition
lysosomes often fuse with this
Term
Endoplasmic reticulum
Definition
often observed to be continuous with outer membrane of nuclear envelope
Term
Nucleolus
Definition
produces ribosomes and contains RNA
Term
Lysosomes
Definition
eat and recycle garbage cells
Term
Golgi
Definition
trafficks proteins
Term
Centriole
Definition
9x3 arrangement of microtubules is characteristic of this
Term
Cilia/flagella
Definition
use ATP for energy to move water relative to a cell
Term
Cellulose
Definition
makes up plant cell walls
Term
Free ribosomes
Definition
part of the cytosol of eukaryotic cells
Term
Mitochondria and Chloroplasts
Definition
organelles that are ancient symbiotic organisms in eukaryotic cells
Term
Cofactors
Definition
non-protein helpers for enzymes
Term
Negative feedback
Definition
product near the end of a pathway binds to an enzyme early in the pathway to reduce its activity
Term
Oxidation
Definition
losing electrons
Term
Reduction
Definition
gaining electrons
Term
Osmosis
Definition
diffusion of water from a solution with a lower concentration to a solution with a higher solute concentration through a semipermiable membrane
Term
Active transport
Definition
uses ATP to move a solute through a membrane against a concentration gradient
Term
Exocytosis
Definition
used to secrete molecules in mass from cells
Term
Citric Acid Cycle
Definition
most CO2 from catabolism of a monosaccharide is released during this cycle
Term
Oxygen
Definition
final electron acceptor at the end of the electron transport chain that functions in aerobic oxidative phosphorylation
Term
Electromagnetic radiation
Definition
has characteristics of both particles and waves
Term
Thylakoid membranes
Definition
where the two photosystems are located
Term
Pyruvate dehydrogenase system
Definition
takes one pyruvate and gives off one CO2, reduces one NAD to NADH, and gives one acetyl group to CoA
Term
Photosystem II
Definition
water molecules are broken into 1/2 O2, 2 electrons, and 2 protons; where chlorophyll (a) P680 is found
Term
Mitochondrial electron transport system
Definition
the immediate function is to pump protons into the intermembrane space between the inner and outer mitochondrial membranes
Term
Chromosome
Definition
has one or two chromatids, made of DNA and protein; most cells in plants and animals have 2 sets
Term
Kinetochore
Definition
found at a centromere
Term
Anaphase
Definition
lasts as long as chromosomes are moving toward the poles
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