Cell Biology Test #3 @ NSU

wolfe an138141 at anon.penet.fi
Fri Dec 2 09:46:39 EST 1994

Cell Biology Test III

1.   What is the function of the TCA cycle and list the products
of the TCA cycle.
          The TCA cycle is a series of enzymatically catalyzed
          reactions that produce
          reduced coenzymes such-as NADH, FADH, GTP, & CO2.
2.   Where are the enzymes located that catalyze the TCA cycle?
          In the matrix of Mitochondrion.
3.   What is the general function of a dehydrogenase and use an
          A dehydrogenase is an enzyme that uses a coenzyme to
          reduce or oxyidize
          a substrate.  Pyruvate Dehydrogenase reduces pyruvate
          to Acetyle Co-A

4.   Are the Oxidation/reduction reactions exothermic or


5.   Is the synthesis of ATP from ADP exothermic or endothermic?


6.   How many ATP are produced from a glycose which is completely
aerobically oxidized?

          36 or 38

7.   Compare the mechanism of ATP production in Photosynthesis to
the mechanism of ATP production in respiration.  How are the two
the same and different?

          They are simular in the waythey synthesis ATP and the
          mechenism of the ETC.  They differ in the source of
          electrons - photosynthesis uses water and respiration
          uses food.  

8.   What is the product of the light reactions?

          ATP, oxygen, and NADPH

9.   What is the function of the assisory pigments?

          They act to funnel light into the central molecule of
          p680 and absorb light that p680 can not

10.  How many quanta of light does it take to transport one
electron from PS2 to NADP?


11.  How many quanta of light does it take to produce one
molecule of oxygen?
12.  Where is the plant cells do the light reactions take place?
          In the grana of the chloroplast.
13.  Where in the plant cell, EXACTLY, do the dark reactions of
photosynthesis take place?
          In the matrix of the chloroplast.
14.  Do the dark reaction of photosynthesis take place during the
day (explain)?

          Yes, because the products that run the dark reactions
          are made during the day.

15.  Summerize the dark reactions of photosynthesis.  Show how
the products of the light reactions are used.


16.  Do plants meet all of their needs by means of

          No.  Roots, seeds, and darkness require the plant to
          use respiration.

17.  Briefly outline how triglycerides and proteins are oxyidized
to produce ATP.
18.  Neuron question.

19.  Describe the mechanism of import into the nucleus compared
to the mechanism of import into a mitochondria/chloroplast.

20.  What types of proteins are synthesised on the RER?

          Water soluble and membrane

21.  How are proteins selected for synthesis on the RER?

22.  Regulated exocytosis v. 

23.  Uptake of LDL particles.

24.  Phagocytosis v pinocytosts

25.  Describe how phagocytosis works (example).

I hope this is of some help.
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