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BIO LAB FINAL
Terms in this set (28)
what are the plant pigments and their colors?
chlorophyl (green) carotenes (red, yellow-orange) xanthophylls (yellow)
what is the solvent front?
how far the solvent traveled up the paper
why do some pigments move farther up the chromatogram than others?
what does the Rf value represent?
the ratio of the distance traveled by the pigment to that of the solvent front
what are chloroplasts?
organelles where the plant pigment is found
what charge does a DNA molecule have?
what is the purpose of the NaCl solution?
-helps the cells separate -changes the charge -makes the solution more dense so the alcohol added will float on top
soap detergent breaks down cell and nuclear membranes. what is it about these membranes that makes them easy to break open using soap?
the inside of the membrane is a lipid bilayer that binds with the lipid soap and breaks down
what charge does a DNA molecule have BEFORE you add salt?
what charge does the alcohol have?
why does the DNA move into the alcohol layer?
what we look like
the genes or alleles we have
interpret results from disinfectants
many colonies: (control) substance hasn't been altered very few colonies: killed most bacteria but not all
no colonies: most effective
what is a community?
group of organisms interacting in a specific area
define natural selection.
organisms better adapted to their environment tend to survive and produce more offspring
if you are using a microscope with a 10x eyepiece and you are looking at an object using the 100x objective, what is the TOTAL MAGNIFICATION of the object? show work.
if the APPARENT LENGTH of an object, while viewed at 100x total magnification, is 0.8, what is its ACTUAL LENGTH? show work.
if you were to dissolve salt into a glass of water, which is the solvent and which is the solute?
water is solvent
salt is solute
hypotonic means ___ solute, and therefore ___ solvent.
hypertonic means ___ solute, and therefore ___ solvent.
the CATALASE in my blood, causes hydrogen peroxide to be converted into ___ and ___.
water and oxygen
name the two denaturing conditions and how that was determined in the lab.
heat was completely denaturing. acidic ph was somewhat denaturing. we know this by the little to no reaction with H2O2.
when you put starch in your mouth there is a chemical reaction that occurs where the enzyme called amylase converts the starch into glucose. what is the product and the subtrate?
product = glucose
subtrate = starch
how do enzymes affect the activation energy of reactions and what is the result?
decrease the amount of activation energy required; this speeds up the reaction
explain why some potato pieces gained weight
they were in a hypotonic solution meaning there was a less solute concentration, so the potato pieces gained water
most cells spend most of their time in what phase?
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