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Virty [35]
2 years ago
7

"The native structure of hemoglobin (Hb) comprises of two α and two β subunits, each of which carries a heme group. There appear

to be no previous studies that report the in-vitro folding and assembly of Hb from highly unfolded α and β globin in a 'one-pot' reaction. One difficulty that has to be overcome for studies of this kind is the tendency of Hb to aggregate during refolding. This work demonstrates that denaturation of Hb in 40% acetonitrile at pH 10.0 is reversible." (J Am Soc Mass Spectrum 2007, 18, 8-16) Hemoglobin is ________. A) a tertiary protein with two polypeptides B) a quaternary protein with two polypeptides C) a tertiary protein with four polypeptides D) a quaternary protein with four polypeptide
Biology
1 answer:
professor190 [17]2 years ago
6 0

Answer:

The correct answer is option D) "a quaternary protein with four polypeptides".

Explanation:

Hemoglobin is a quaternary protein with four polypeptides. Hemoglobin is comprised of four polypeptides, two alpha chains with 141 amino acid residues and two beta chains with 146 amino acids residues. Hemoglobin is classified as a quaternary protein, because it reaches a quaternary structure when the different polypeptides are attached to each other.

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2 years ago
Matching Responses and Stimuli
lora16 [44]

Answer:

smelling rotten eggs - covering your nose

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Explanation:

<u>A stimulus generally refers to a detectable change in the environment of an organism. These changes could be physical or chemical and could be in the internal or external environment of organisms. </u>

Organisms react to changes in their internal or external environment by responding appropriately. Hence perceiving the smell of rotten egg, feeling the hotness of a dish by touching it, and feeling cold immediately one jumps into a cold pool are all examples of stimuli and their corresponding responses would be covering one's nose, pulling the hand away, and shivering of the body in order to counter the cold.

In other words:

<em>smelling rotten eggs - covering your nose</em>

<em>touching a hot dish - pulling your hand away</em>

<em>jumping into a cold pool - shivering</em>

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The passive transport of water is specifically called ________.
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