If myoglobin is found in all chordates, urochordates, and cephalochordates, b-globin is found in all vertebrates, a-globin in all ostracoderm descendants, z-globin in all gnathostomes, e-globin in all viviparous mammals, and g-globin in all placental mammals, then the most ancient of these genes:must be epsilon-globin (e-globin), found only in descendants of the ancestral marsupialsmust be myoglobin, found only in descendants of the chordates, urochordates, and cephalochordatesmust be gamma-globin (g-globin), found only in descendants of the ancestral placentalsmust be zeta-globin (z-globin), found only in descendants of the ancestral gnathostome fishesmust be beta-globin (b-globin), found only in descendants of the ancestral vertebrates

Answered: If myoglobin is found in all chordates,…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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If myoglobin is found in all chordates, urochordates, and cephalochordates, b-globin is found in all vertebrates, a-globin in all ostracoderm descendants, z-globin in all gnathostomes, e-globin in all viviparous mammals, and g-globin in all placental mammals, then the most ancient of these genes:

must be epsilon-globin (e-globin), found only in descendants of the ancestral marsupials
must be myoglobin, found only in descendants of the chordates, urochordates, and cephalochordates
must be gamma-globin (g-globin), found only in descendants of the ancestral placentals
must be zeta-globin (z-globin), found only in descendants of the ancestral gnathostome fishes
must be beta-globin (b-globin), found only in descendants of the ancestral vertebrates

Expert Solution

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Hemoglobin is the red blood pigment, exclusively found in the erythrocytes. This helps in the delivery of O₂ from the lungs to the tissues and transport of CO₂ and protons from tissues to lungs for excretion. It is a tetrameric allosteric protein containing globin- the apoprotein part and the heme- the non-protein part (prosthetic group).

Myoglobin is a monomeric oxygen binding hemoprotein found in the heart and skeletal muscle. It has a single polypeptide chain with heme moiety. Myoglobin structurally resembles the individual molecules of hemoglobin.

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