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BIO 100 LAB EXAM 2
Terms in this set (25)
What are the products of Respiration? What are the reactants of photosynthesis?
The products of respiration are Carbon Dioxide, ATP, and water. The reactants of photosynthesis are Carbon Dioxide and water.
Wood is a complex carbohydrate called cellulose. What product is produced by both burning wood and by chemical respiration of carbohydrates?
Write out the equation for photosynthesis:
6H2O + 6CO2 -light- C6H12O6 + 6O2
water + carbon dioxide -- glucose + oxygen
In the lab what happened to the water when you added phenol red?
What happened to the water solution in question 4 when you breathed into it? What caused this change?
CO2, which is acidic when dissolved in water, changed the color of the phenol red form red to orange
When Elodea stems were inserted into the tube of solution from question 5 what happened to that solution over time? What caused the change?
The Elodea went through photosynthesis, which took the CO2 out of the water and turned it back to red
You added Sodium Azide (actually, your TA did) in order to do what?
Sodium Azide interfered with the electron transport system, preventing aerobic respiration and causing anaerobic respiration (fermentation) to occur instead.
What natural gas contributes to the process of global warming and how is it related to photosynthesis and cell respiration?
CO2; photosynthesis uses this as a reactant and it is a cellular respiration product.
A respirometer experiment testing the ability of yeast cells to utilize various fuels for respiration yielded the following information:
Fuel Gas produced
Sucrose 2.2 mm
Glycerol .08 mm
Protein .5 mm
Based only on the above table, what is the optimum fuel for yeast?
According to the answers published on our web site what was the order of effectiveness of the respiratory fuels used to produce respiration in yeast?
Glucose was the most, then both glycerol and protein had none.
List four substances necessary for a plant to grow
Light, water, CO2, soil
Differentiate between the types of respiration with regard to the following:
a. The end product of anaerobic respiration in humans
b. The end product of anaerobic respiration in yeast cells.
c. The relative amounts of ATP generated by anaerobic versus aerobic respiration.
a. In humans--> 2 lactic acid
b. In yeast--> 2CO2 and 2 alcohol
c. An anaerobic cycle produces only 2 ATP which an aerobic cycle produces 36 ATP.
What are the 2 most abundant "greenhouse gasses" and which one is most abundant?
Water vapor is the most abundant, followed by CO2.
Larger, heavier particles diffuse _____________________ (Faster, slower, at the same speed) as smaller, lighter particles?
If Elodea cells are placed in the following three solutions, what will their appearance be and why?
Describe each of the substances as isotonic, hypertonic, or hypotonic to the Elodea cells
a. 10% NaCl
b. 0.9% NaCl (Contact lens solution)
c. distilled water ?
a. Hypertonic to the Elodea cells; the Elodea cells will shrink.
b. Isotonic to the Elodea cells; the Elodea cells will stay the same.
c. Hypotonic to the Elodea cells; the Elodea cells will swell.
Identify the following substances as reactants (R) or products (P) of photosynthesis:
-Carbon Dioxide= Reactant
What happened to the weight of the dialysis bag filled with water and placed in a syrup solution?
It got lighter because the water diffused out.
Carrot pieces placed in 10% NaCl did what?
Shrunk due to losing water weight through Osmosis.
What happened to carrot pieces placed in distilled water?
Enlarged due to gaining water weight through Osmosis.
Which solution caused the dialysis bag to gain the most weight? 50% syrup, 100% syrup?
What is "Osmosis?"
Diffusion occurring in all cells involving movement of water across a selectively permeable membrane.
What is "Diffusion?"
A substance, not limited to water, moving from high to low concentration
What did you measure in the Investigation involving syrup and dialysis tubes?
the effect of high and low concentrations of solution in osmosis
What substance did you add to small tubes, then try to read printed text through?
Red blood cells
If you can read text through the tubes referred to in 18, above, what does it mean about the cells involved?
It means that solution was hypotonic to the cells and that water moved into the cells and continued to do so until the cells swelled and burst. Since they burst, there are no more large particles to make the solution look cloudy, and thus you can read text through them.
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