lab quiz 5 Flashcards
green chlorophylls usually./…
capture the majority of light used in photosynthesis
chlorophyll is polar or non polar
polar
carotenoids are part of a larger collection of plant-derived compounds called
terpenes
compound responsible for the red coloring of tomatoes and watermelon?
lycopene
compound responsible for orange of carrots?
Beta carotene
what do carotenoids do for the human body?
act as antioxidants and antiflammatories
lycopene and beta carotene are examples of
carotenoids
what is xanthopylls ?
oxidized versions of carotenes
what is pheophytins?
look like chlorophyll but the magnesium ion is replaced by two hydrogen ions
light absorption spectra
the absorption of light at different wavelengths permits the analysis of quantities, types, and efficiency of pigments present in leaves
TLC can do what
can confirm presence or absence of various pigments
what happens to light not absorbed in photosynthesis?
reflected or transmitted
absorption spectrum for an individual pigment:
amount of light energy at various wavelengths which is absorbed by that pigment
what does the spectrophotometer measure?
proportion of light at a specific wavelength which is absorbed or transmitted
chromatography is a term for:
methods of separating molecules (pigments) from each other
what is coated on the TLC plate
silicon gel which is polar
bottom of TLC plate is placed in
a mixture of solvents which is less polar than the silica gel
nonpolar pigments on TLC plate
will dissolve rapidly in the non polar solvent
polar pigments on TLC plate
will be attracted to the polar silica gel
