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Biology question help?

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Biology question help?

Postby revision » Sat Dec 08, 2012 6:24 pm

1,Imagine that in a e.coli culture that was growing with glucose as its nutrient source you could artificially increase cAMP levels (which are normally associated with starvation). What would happen to the expression of beta-galactosidase?
Options:

1.It would be activated because the cAMP binding protein CAP would bind to the beta-galactosidase promoter

2. It would be reduced

3. It would remain at the same relatively high level

4. It would remain at a very low level

I think the answer is 1


2,Which of the following proteins are least likely to contain a signal peptide?
Options:

1.Cytosolic proteins

2. Nuclear Proteins

3. Secretory proteins

4. Membrane proteins

I think the answer is membrane proteins
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Postby JackBean » Mon Dec 10, 2012 5:57 pm

2. really? And how are they incorporated into the membrane?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re: Biology question help?

Postby revision » Tue Dec 11, 2012 12:02 am

The answer must then be cytosolic proteins. I didn't know between option 1 and 4. am i correct now?
And is question number 1 correct i think it is option 1? :?
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Postby JackBean » Tue Dec 11, 2012 12:28 pm

yes, the cytosolic proteins don't need any signal sequence ;)
http://www.biolib.cz/en/main/

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Re: Biology question help?

Postby jessic1800 » Thu Dec 20, 2012 10:44 pm

i need help. how long does it take to grow bacteria in a petri dish with agar nutrient????? :?
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Postby JackBean » Thu Dec 20, 2012 11:36 pm

depends on species and temperature
http://www.biolib.cz/en/main/

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