Search found 17 matches

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Mon Nov 08, 2010 9:33 pm
Forum: Cell Biology
Topic: signal transduction, which of the following are correct
Replies: 2
Views: 10998

signal transduction, which of the following are correct

I have to pick the correct six statements from the following. Could you tell me if my answer is correct? Thank you! a) signal transduction cascades, often involving protein kinases, amplify a signal intracellularly. b) a receptor may pass on a signal by interacting with another protein or by acting ...
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Thu Oct 07, 2010 9:25 pm
Forum: Cell Biology
Topic: chymotrypsin mechanism
Replies: 0
Views: 2104

chymotrypsin mechanism

what are the correct steps for the mechanism of chymotrypsin? Below is my answer but I don't know if it is right. a) His 57 catalyzes removal of H from Ser 195 hydroxyl. b. Ser 195's nucleophilic O attacks carbonyl C of substrate. c. His 57 donates H to N of sissile peptide bond, tetrahedral interme...
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Fri Oct 01, 2010 9:34 pm
Forum: Molecular Biology
Topic: microfilaments and microtubules
Replies: 0
Views: 7991

microfilaments and microtubules

which of the following apply to microtubules, which to microfilaments and which to both? 1. all the nucleotide-binding sites point the same direction 2. monomers bind GTP 3. dimers polymerize into protofilaments that they associate side by side 4. structure is adouble chain of subunits 5. fibers pol...
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Fri Oct 01, 2010 9:21 pm
Forum: Cell Biology
Topic: Kinesin- which of the following are true?
Replies: 0
Views: 4762

Kinesin- which of the following are true?

1. kinesin has a low processivity 2. kinesin molecules have a stiff neck region between the globular head and the tail. 3. each kinesin head has a tubuli-binding site and a nucleotide-binding site. 4. kinesin's cargo binds to the light chains of the kinesin molecule. 5. kinesin requires the energy p...
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Thu Nov 19, 2009 3:16 am
Forum: General Discussion
Topic: biochemistry-enzyme kinetics lab help
Replies: 2
Views: 5689

biochemistry-enzyme kinetics lab help

Hello, I had to do a lab on enzyme kinetics: finding Vmax and Km for alkaline phosphatase. What are some sources of error that could be found when conducting this kind of experiment? I know that temperature could be one of the errors, but could you please help me find other types of errors encounter...