126 - ____ = ____/____ = ______.__

Biology 332
Spring 1997

Exam I

Name________________________

Why Study Plants? 12 points
Tell how your life as a biology major is impacted by plants...directly or indirectly. Go through your career as a student trying to think of as many different ways plants have been involved in your biology and chemistry classes. You only need to mention a fundamental "connection" once. A list might be the best way to approach this question. Remember to account for maintenance of your own living state during the classtimes! Don't write books...it's only worth 12 points!

Oxygen in the air I'm breathing
Food digesting in my stomach
Rubber tubing in chemistry lab
Wooden chair I'm sitting on
Fossil fuel in the bunsen burner
Electricity from fossil fuel for light
Fiber in the clothes I'm wearing
The flavor of toothpaste still in my mouth
Varnish on the chair, paint on the walls
Medicines/Drugs like the caffeine keeping me awake
I hope this stuff will help me get a job!
Her/His Windsong stays on my mind

Cell Cycle and Cell Division 13 points

Name the cell type that goes through the cell cycle continuously.meristematic
Name an isodiametric cell type that is alive but does not cycle.parenchyma
In what part of the cell cycle (be specific) is the non-cycling cell stopped?G1 or G2 of interphase
Name the longest phase of the cell cycle.interphase
What is the VERY LAST step in the cell cycle?cytokinesis
In what specific part of the cell cycle is transcription likely?G1 or G2 of interphase
In what specific part of the cell cycle is replication likely?S of interphase
Name a functional cell type that does not cycle because it is dead.sclerenchyma

Cell Structure 30 points
Here is a place to strut your stuff on the structure and function of cell components. Fill in the table below to identify the parts of a photosynthetic parenchyma cell, label each part with both name and function(s). Most organelles should have two functions each (hint: thinking about internal structure might assist you in this). For functions, "protection" or "support" would be insufficient as they are way too vague...protection from what? ...support of what type? ...storage of what material? ...transport of what from where to where?

Name of organelleOne functionA second function
Middle Lamellaglues cells togetherDigested in fruit ripening
Cell Wallwithstands pressureloosens for cell growth
Cell Membraneimport of hormonesexport of CW materials
Cytosolglycolysissucrose synthesis
Nucleustranscriptionreplication
Chloroplastlight reactionsCalvin cycle
MitochondrionKreb's cycleelectron transport
Golgi/Dictyosomeproduct sortingvesicle packaging
Rough Endoplasmic Reticuluminternal transporttranslation
Vacuoletoxic waste processingmalate storage (CAM)

Respiration 21 points Give the overall reaction (in one step) for respiration:

In your reaction above, circle the components involved directly in glycolysis.
In your reaction above, put a square around the components involved in the Kreb's cycle.

Specifically where in the cell does glycolysis take place?cytosol
Specifically where does the Kreb's cycle take place?mitochondrial matrix
Specifically where is the electron transport system located?mitochondrial cristae

Make a graph below showing the relationship between light intensity and respiration rate that you would expect over the normal range of outdoor light intensities. Be sure to label both axes and write the word "respiration" to the right end of the line/curve that shows the relationship. Now add a second line/curve showing the relationship between light intensity and photosynthetic rate; be sure to write the word "photosynthesis" to the right end of that line/curve. 6 points

What does your graph tell you about how much light is needed to grow a decent plant? If you want, you can refer to additional marks made on the graph above (label them A, B, C, etc.). 3 points

Photosynthesis 33 points Give the overall reaction for photosynthesis: 10 points

In your reaction above, circle the components involved in the light reactions.

Make a graph below showing the relationship between light wavelength (over the visible spectrum) and the absorption of light by chlorophyll. Label this line/curve with "absorption spectrum." Now add a second y-axis (maybe on the right end of the x-axis) to show the relationship between light wavelength and the rate of photosynthesis. Label this line/curve with "action spectrum." Be sure to label all three axes. 7 points.

If the two lines/curves you drew do not match in shape, explain the differences you tried to show. 2 points

Compare the three kinds of photosynthesis: 14 points

C-3 PlantC-4 PlantCAM Plant
Name an example plant or the biome
(habitat) where it is found abundantly
beans, forest floorcorn, tropical grasslandcactus, desert
Is the Calvin Cycle operating in daytime? Yes No Yes No Yes No
Is photorespiration a problem? Yes No Yes No Yes No
Does it involve two different cells? Yes No Yes No Yes No
Is the plant doing anything
photosynthetic at night?
Yes No Yes No Yes No
Is PEP carboxylase an important
enzyme?
Yes No Yes No Yes No
This is most competitive where light is
abundant but water is severely limited.
Yes No Yes No Yes No
This is most competitive where light is
abundant and water is moderate.
Yes No Yes No Yes No
This is most competitive where light is
not optimal.
Yes No Yes No Yes No

Meristems 17 points
In the space below diagram a root apex. Be sure to label the: 13 points

Name the appendages on a shoot apex.leaf primordia
Name the non-growing zones along the length of the shoot.nodes
There are two different kinds of meristematic "domes" near a shoot tip.
The one on the very tip is called theapical bud
The ones along the side of the shoot are called thelateral bud


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