mjl1717
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which is not true concerning myoglobin.?
a)its a subunit at 17,800 kDa
b) is an early cardiac marker
c)has half life of about 9 minutes
d)can be increased in cocaine use.
e)is a globular protein with a sigmoid O2 disassociation curve
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| surgery
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e Myoglobin is a single chain protein
Correct me if I am wrong
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| mjl1717
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a globular protein can have a single chain
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| general malaise
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E....myoglobin is a hyperbole
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| mjl1717
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incorrect
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| general malaise
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where did u get this q? i don't know anything about choices a-d, but i'm sure myoglobin has a hyperbolic oxygen dissociation curve, not sigmoid
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| mjl1717
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so what kind of dissociation curve does hemoglobin have?
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| general malaise
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its hyperbolic meaning that it has a higher oxygen affinity than hemoglobin and doesn't show cooperative binding like hemoglobin does
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| mjl1717
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but Im asking you or anyone else what kind of curve is the hemoglobin dissociation curve then I can answer better?
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| general malaise
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hemoglobin has a sigmoid shaped curve due to the fact that it exhibits cooperative binding meaning that the binding of oxygen to one site increases the affinity for oxygen in the remaining sites. since myoglobin has only one binding site the binding or releasing of oxygen doesn't increase or decrease its affinity for oxygen
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| mjl1717
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you are correct. my mistake. I actually meant to say that myoglobin is a hyperbolic
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| mjl1717
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By the way my qs are about 80% original
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| manikandan
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the answer is B
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| 26malik
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Than the answer Will be B ?
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| mjl1717
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the answer is e
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| 26malik
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please explain how it is an early cardiac marker? 
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| mjl1717
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years ago, it was the first cardiac marker. and myoglobin is a degradation product from muscle
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| xwxf
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E
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| mjl1717
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yes-answer-e, myoglobin is a hyperbola
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