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Test 2 Vocab
photosynthesis, cell communication, mitosis, meiosis
51
Biology
Undergraduate 1
02/25/2013

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Term
Thylakoid membrane
Definition
chloroplast membrane of flattened sacs where light reactions take place
Term
Grana
Definition
stacks of thylakoid
Term
Stroma
Definition
liquid space between grana
Term
stoma
Definition
pores on leaves that control water output and co2 input
Term
mesophyll
Definition
middle layer of leaf where chloroplasts are located
Term
chlorophyll a
Definition

primary pigment in plants 

absorb red and blur/violet light

Term
chlorophyll b
Definition
secondary pigment for broadening absorbance range
Term
carotenoids
Definition

accessory pigment

absorbs green light

Term
Split H2O
Definition
donates e- to chlorphyll to replace excited ones
Term
Cyclic phosphorylation
Definition
light + H2O = ATP
Term
Noncyclic phosphorylation
Definition
Photosystem 2, Photosystem 1, NADP reductase, ATP synthase
Term
Calvin cycle
Definition
biochemical pathway allowing for carbon fixation
Term
RuBP + CO2 =
Definition
2PGA
Term
2 PGA reduced to
Definition
2 G3P
Term
Reduction in calvin cycle requires ___ ATP
Definition
12
Term
Regeneration of RuBP requires ____ ATP
Definition
6
Term
Glucose is generated from G3P in the
Definition
cytoplasm
Term
carbon fixation in the calvin cycle requires ____ total ATP
Definition
18 ATP
Term
Carbon fixation is catalyzed by
Definition
rubisco
Term

Production of Glucose requires:

______ ATP

______NADPH

Definition

18 ATP

12 NADPH

Term
2 processes that compete for the active site on rubisco
Definition

carboxylation

photorespiration

Term
molecules that compete for the active site on rubisco
Definition

O2

CO2

Term
c4 plants
Definition

use pep carobxylase

have 2 types of cell for photosynthesis

prefer hot environments

no calvin cycle?

Term
CAM plants
Definition

stomata only open at night to capture CO2

adds PEP to co2 to make a butane compound

Term
ligand
Definition

signaling molecule

ion/protein

Term
receptor protein
Definition

recieves and bonds to ligands

on or in membrane

Term
hydrophylic ligand
Definition
must bond to a membrane receptor
Term
hydrophobic ligand
Definition
slide thorugh membrane and bond to intracellular receptor
Term
direct contact signaling
Definition
cells are adjacent
Term
paracrine signaling
Definition
cells are relatively close together
Term
endocrine signaling
Definition

far away cells

hormones move through blood

Term
synaptoc signaling
Definition

nerve cell signaling

through ions

Term
signal transduction
Definition
events within the cell that occur in response to signals
Term
protein kinase
Definition
activates by adding PO4
Term
Phosphatase
Definition
deactivates by removing PO4
Term
steroid hormones
Definition

non polar

lipid soluble

cross plasma membrane

affects gene expression

enter through nuclear pores

Term
signal amplification
Definition
one signal molecule binds to a receptor and triggers more than one response protein
Term
G- protein
Definition

protein bound to GTP

binds to receptors

uses ATP

faster

Term
tight junctions
Definition
sheets of cells within a tissue
Term
anchoring junctions
Definition
cytoskeletons of cells connected
Term
communicating junctions
Definition

permit small molecules to pass beween cells

gap juctions: animal muscles

plasmodesmata: plants phylum xylem

Term
action potential
Definition
measurement of charge across a cell membrane
Term
Gravitropism
Definition
respose of a plant to gravity
Term
phototropism
Definition
response of a plant to light
Term
thigmotropism
Definition
growth of a plant due to contact
Term
kinetochores
Definition
protein where spindle fibers attach
Term
centrioles
Definition
pulls the cell apart in anaphase and telephase
Term
centromere
Definition
links siter chromatids
Term
cohesin proteins
Definition
regulate separation of chromatids
Term
spindle fibers
Definition
move chromosomes to the egdes of the cell
Term
cyclins
Definition
proteins that regulate checkpoints in meiosis
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