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I need answers to the following questions...

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I need answers to the following questions...

Postby WiseIdiot » Sat Oct 18, 2008 5:55 pm

1. Where is most of the water in the following reaction produced?
C6H12O6 (glucose) + O2 -----> CO2 + H2O
a. chloroplast stroma
b. thylakoid lumen
c. glycolysis and Krebs cycle
d. fermentation
e. mitochondrial matrix

2. At the end of mitosis, each G1 daughter cell has _________.
a. twice the DNA and half the cytoplasm of the G1 parent cell.
b. identical DNA to that of the G1 parent cell.
c. half the DNA and half the cytoplasm if the G1 parent cell.
d. twice the cytoplasm and the same amount of DNA as the G1 parent cell

3. DNA is composed of four nucleosides: adenosine, cytidine, thymidine, and guanosine. If scientists introduced radioactive thymidine into the growth medium of the cells, it would be incorporated into the DNA molecule __________.
a. at any point in the cell cycle
b. when centromeres split so the two chromosomes can be separated.
c. during interphase.
d. as the cell enters G1.
e. none of the above.

4. Consider the experiment that involves feed cells radioactive thymidine to analyze their progress through the cell cycle. If all the cells in culture were all synchronized in terms of where they were in the cell cycle, what might be expected?
a. the cells might not have been labeled at all.
b. the time from pulse to first cells entering mitosis would probably have been longer.
c. the duration of labeled cells in mitosis would have been much shorter.
d. any of the above might have occurred.
e. none of the above would likely have occurred.

5. In George Palade's classic pulse-chase experiments, the importance of performing the chase as opposed to continuous labeling for various lengths of time, is to:
a. detect proteins synthesized after the "pulse"
b. avoid detecting proteins synthesized after the "pulse"
c. detect proteins synthesized before the "pulse"
d. avoid detecting proteins synthesized before the "pulse"
e. minimize the potentially disruptive effects of long-term radiation exposure

6. Which part of a receptor tyrosine kinase, at one time, existed in the lumen of the endoplasmic reticulum?
a. the kinase region
b. the regions which ultimately can interact with the receptor's ligand (hormone, etc.)
c. the transmembrane (membrane spanning) region.
d. all of the above
e. none of the above.

7. Which of the following statements concerning cellular metabolism is false?
a. Glycolysis is inhibited when cellular energy levels are abundant.
b. Krebs cycle activity is dependent solely on availability of substrate; otherwise it is unregulated.
c. In the electron transport chain, electrons decrease in energy level as the are transferred from one electron carrier to the next.
d. Reactions of the Krebs cycle take place in the mitochondrial matrix.
e. Glycolysis may be able to proceed even if the Krebs cycle is blocked.

8. Following glycolysis and the Krebs cycle, before the ETC and oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2. Most of the energy from the original glucose at this point is in the form of _______.
a. ATP b. CO2 c. H2O d. NADH e. FAD
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Postby stopherlogic » Sat Oct 18, 2008 7:32 pm

What answers did you get?
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Re: I need answers to the following questions...

Postby WiseIdiot » Sat Oct 18, 2008 9:20 pm

I wasn't so sure about these questions.
1. e
2. b
3. c
4. c
5. b
6. a
7. e
8. d

Help on these would greatly be appreciated.
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Re: I need answers to the following questions...

Postby WiseIdiot » Sun Oct 19, 2008 1:32 am

Let me clarify. I have already submitted these questions for my assignment.
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