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: 791

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of this is not a normal base found in tRNA?

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#Question id: 1542

#Unit 4. Cell Communication and Cell Signaling

function of  calprotectin?

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#Question id: 24232

#Unit 4. Cell Communication and Cell Signaling

Desmocollins and desmogleins that form desmosomes are

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#Question id: 18621

#Unit 13. Methods in Biology

Variants of PCR has been devised to enhance efficiency are

a) qPCR with SYBR, TaqMan and MB

b) nested PCR

c) Touchdown start PCR

d) hot start PCR

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#Question id: 3557

#Unit 8. Inheritance Biology

What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?