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: 12160

#XL - S Microbiology

Which of these was not derived from an ancestral alpha proteobacterium?

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#Question id: 12160

#XL - R Botany

Which of these was not derived from an ancestral alpha proteobacterium?

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#Question id: 12311

#XL - T Zoology

Animals tend to maximize their energy intake- to- expenditure ratio. What is this behavior called?

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#Question id: 12342

#XL - T Zoology

Which of the following is a biological attribute that would most likely allow a species to become cosmopolitan in distribution?

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#Question id: 12344

#XL - T Zoology

The concept of punctuated equilibrium refers to

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#Question id: 12567

#XL - R Botany

Which of the following is true about the current research about forest fragmentation?