Given that the enzymes that catalyze nitrogen fixation are inhibited by oxygen, what are two ʺstrategiesʺ that nitrogen-fixing prokaryotes might use to protect these enzymes from oxygen?

1.  couple them with photosystem II (the photosystem that splits water molecules)

2.  package them in membranes that are impermeable to all gases

3.  be obligate anaerobes

4.  be strict aerobes

5.  package these enzymes in specialized cells or compartments that inhibit oxygen entry

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#Question id: 1216

#Unit 4. Cell Communication and Cell Signaling

In yeast signal transduction, a yeast cell releases a mating factor, which:

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#Question id: 11369

#Unit 9. Diversity of Life Forms

If new genetic variation in the experimental populations arose solely by spontaneous mutations, then the most effective process for subsequently increasing the

prevalence of the beneficial mutations in the population over the course of generations is

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#Question id: 27918

#Unit 11. Evolution and Behavior

What does evolution indicate?

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#Question id: 10756

#Unit 10. Ecological Principles

Which of following is correct about interaction?

A) Population growth of each species is limited more by intraspecific competition than by interspecific competition.

B) The species with the greater initial abundance wins out.

C) Population of each species coexist and reach at stable equilibrium point

D) Population growth of each species is limited by only intraspecific competition

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#Question id: 31317

#Unit 3. Fundamental Processes

A gene encoding tRNA undergoes capable of the misreading of UGA codon and inserts tyrosine in the peptide chain. This behaviour is called as