The inner (plasma) membrane of E. coli is about 75% lipid and 25% protein by weight.  How many molecules of membrane lipid are there for each molecule of protein?  (Assume that the average protein is Mr 50,000 and the average lipid is 750.)

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#Question id: 20031

#XL - P Chemistry

Frequency of matter wave is equal to v = frequency, v = velocity of particle

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#Question id: 20172

#XL - P Chemistry

The de-Broglie wavelength of a particle with mass 1g and velocity 100 m/s is

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#Question id: 369

#XL - Q Biochemistry

Calculate the pH of a 2.0 L solution containing 10 mL of 5 M acetic acid and 10 mL of 1 M sodium acetate. (pKa = 4.76)

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#Question id: 5252

#XL - S Microbiology

Which type(s) of genetic transfer lead to incorporation of new DNA into the bacterial chromosome?

I. Conjugation mediated by F factor

II. Hfr mediated conjugation

III. Transduction

IV. Transformation

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#Question id: 11426

#XL - R Botany

Which of the following biomes is associated with a mediterranean climate?