Essay assessment DRA 001W2009 Dr. Rossini
(based heavily on the UC Davis TRC example modeled after the UC Davis English Department model)
The essay is worth 80 points and will be evaluated according to the categories: Ideas, Organization/Coherence,
Chapter 25 End of book questions : 1, 2, 5, 10, 13
1.) There are 64 codons available for 20 amino acids. Why do you think 61 codons are actually used to
specify the 20 amino acids?
-If only 20 codons were used, there would be 44 not coding for any amino a
Chapter 14 End of Chapter Questions
3. In breaking down fatty acids to acetyl-CoA:
a. What is always the first step?
Activation to convert them into acyl-CoA derivatives
b. Where does this occur?
On the outer mitochondrial membrane
c. Where does fatty aci
Chapter 24 End of Book questions: 1, 2, 3, 4
1.) In what ways does RNA synthesis differ from DNA synthesis?
-RNA polymerase uses ATP, CTP, GTP, and UTP as substrates (cf. dATP, dCTP, dGTP and dTTP).
Most importantly, RNA polymerase can initiate new chains
End of chapter 7 questions 1, 2, 5 through 9
1.) Describe the Lipid bilayer structure of membranes.
*The basic structure of all biological membranes is the lipid bilayer. It is formed from
components that have amphoteric structures, comprised of a hydroph
End of book Questions chapter 20: 1,2,3,8,9, 13-16
1.) What are the two main ways by which the activities of enzymes may be reversibly modulated?
-By allosteric control; or by covalent modification of the enzyme, the chief mechanism for this
Chapter 19 End of Chapter Questions
1. Describe the method of ribotidation.
PRPP of 5phosphoribosyl1pyrophosphate is the universal agent. Its formation from ribose5
phosphate and ATP and its mode of action are given in Synthesis of purine and pyrimidine
Chapter 21 End of book questions: 1, 2, 3, 6, 7
1.) Explain in general terms, what is meant by the terms light and dark reactions in photosynthesis.
-Light reactions involve the splitting of water using light energy, and the reduction of NADP+ to
Chapter 26 End of book questions : 1
1.) Describe how the lac operon is controlled.
-The operon is blocked by a repressor protein. In the presence of lactose, the repressor detaches (see
Fig. 26.3) pg. 412
DRA 001 Winter 2009 IDEAS/TERMS FOR REVIEW (this list may not be all-inclusive) definitions of performance frame convention, Brecht, defamiliarization, Verfremdungseffekt or "alienation effect", gestus, Stanislavski, emotion memory, objective, subtex
Chapter 13 End of Chapter Questions
2. What is meant by substrate-level phosphorylation? Give an example of such a system. How does
this differ in basic terms from oxidation phosphorylation?
It occurs when a high energy phosphoryl group transferable to AD