Couple Biology questions - (Dec/02/2005 )

1.Are homeobox-containing genes involved in the transcriptional regulation of other genes?
2.What role does a transcription factor play in a signal transduction pathway?
3.Differentiation of cells is not easily reversible because it involves
A. Changes in chromatin structure that make certain regions of the genome inaccessible.
B. Changes in the nucleotide sequence of gene with genome.
C. Chemical modification of histones and DNA methylation.
D. B and C only
E.A,B, and C.
4. A small, impermeable membrane is placed between the anchor cell and the other vulva precursor cells in a larva of C. elegans. What would you expect the result to be? I think it involves something with the developments of parts.
5. The embryonic development of C.elegans illustrates all of the following developmental concepts except:
A. Inducers bring about their effects via the activation or inactivation of genes that code for transcriptional regulators.
B. The response of an induced cell involves the establishment of a unique pattern of gene activity.
C. Sequential inductions direct the formation of complex structures in the developing embryo.
D. An inducer's effect can depend on its concentration gradient.
E. The signal transduction pathways activated by inducers are unique to embryonic cells.




Please help me with these questions. I just kinda dont get it.. thankx

what the #¤/&!

Whats wrong with young students eyes?

you may have correction of this exam...

there is no problem to answer to a specific question and to work with net colleagues but these questions need to be little studied.
Google gonna helps on most of these... you may use "homebox genes", "signal transduction" or such links for start.
Anyway, i'm gonna answer one of your questions : transfcription factor is generally the last target of a signal transdcution pathway and activates the transcription of genes (1 or group of related genes) that ensure cell response to a stimulus.

kle = garron = .... ?

i already realized that some students do not take learning any serious. how can you want to be a scientist and don't understand things (and don't even know where to look it up ) ?

kle = garron = .... ?

i already realized that some students do not take learning any serious. how can you want to be a scientist and don't understand things (and don't even know where to look it up ) ?

[why after graduating, kle will step right into a PI position, and have his minnions run around and do all the basic stuff, while kle'll get a nobel prize for creating superfantastic ultimatemunchie thingie]

vetticus3 now u rock

Also i think Kle needs to go to math class....Couple of questions??? hon..it seemed more like a couple of DOZEN questions

This reminds me of a student I had in one lab class I taught as a TA. We had a lab review prior to the final exam and the student asked me a question that I didn't want to answer because as I told him, there's one whole page in your textbook that's devoted to that question. And the student said he knows but it's too long to read that's why he's just asking me. That's enough to annoy anyone. I told him, "it's your job as a student to read. It's not my job to narrate the textbook to you just because you don't feel like reading."

G gle.....

G gle.....