The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as

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#Question id: 12734

#XL - S Microbiology

Name the US-based company which is able to provide personal genetic information based on analysis of disease genes such as diabetes and others.

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#Question id: 15864

#XL - S Microbiology

 In plant tissue culture-callus is__

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#Question id: 5740

#XL - R Botany

Pollen from one species germinates on the stigma of another related species and sexually fertilizes the ovule. Most of the resulting plants are sterile but some of the resulting offspring undergo chromosome duplication resulting fertile plants. The fertile offspring are known as

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#Question id: 364

#XL - S Microbiology

 A solution contains 0.0000001 (10-7) moles of hydrogen ions [H+] per liter. Which of the following best describes this solution?

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#Question id: 20175

#XL - P Chemistry

According to Bohr’s theory, the energy required for the transition of H atom from n = 6 to n =8 state is