Free living nitrogen fixing takes place as shown in the following;

             TYPE                                                                                       N-FIXING GENERA

A) Cyanobacteria (blue-green algae)                                        i) Bacillus

B) Aerobic                                                                                     ii) Clostridium

C) Facultative                                                                              iii) Anabaena

D) Anaerobic nonphotosynthetic                                            iv) Rhodospirillum

E) Anaerobic photosynthetic                                                     v) Azospirillum

 Which of the following combination of free living nitrogen fixing bacteria is correct?

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#Question id: 18900

#Unit 13. Methods in Biology

Which statement is correct regarding ratio of half-life of radioactive material to its mean life?

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#Question id: 2071

#Unit 2. Cellular Organization

Diffusion of ions across membranes through specific ion channels is driven by:

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#Question id: 3630

#Unit 8. Inheritance Biology

In the pearl-millet plant, color is determined by three alleles at a single locus: Rp1 (red), Rp2 (purple), and rp (green). Red is dominant over purple and green, and purple is dominant over green (Rp1 > Rp2 > rp). What will be expected phenotypes and ratios of offspring produced by the Rp1/rp × Rp2/rp crosses?

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#Question id: 1091

#Unit 4. Cell Communication and Cell Signaling

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

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#Question id: 24172

#General Aptitude

The “lead” inside the common pencil is actually not lead at all.