Pax-6 usually causes the production of a type of light-receptor pigments. In vertebrate eyes, though, a different gene (the rh gene family) is responsible for the light-receptor pigments of the retina. The rh gene, like Pax-6, is ancient. In the marine ragworm, for example, the rh gene causes production of c-opsin, which helps regulate the wormʹs biological clock. Which of these most likely accounts for vertebrate vision?

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#Question id: 9617

#Unit 9. Diversity of Life Forms

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: 23082

#Unit 12. Applied Biology

The technique of organ culture may be divided on the basis of employing

a) solid medium

b) liquid medium

c) semi-solid medium

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#Question id: 33368

#Unit 1. Molecules and their Interaction Relevant to Biology

At what oxygen concentration will myoglobin be 75% saturated with oxygen, if p50 = 2.8 torr

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#Question id: 28802

#Unit 2. Cellular Organization

Listeria is a food-borne pathogen, it move from one host cell to another, and it involves to enable the polymerization of actin by efficiently activating the Arp2/3 complex, how?

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#Question id: 31299

#Unit 5. Developmental Biology

In chick embryo, the space between the blastoderm and the yolk is called as: