Match the descriptor in the left hand column to the type of molecule it describe

Question

Match the descriptor in the left hand column to the type of molecule it describes listed in the right hand column.

Question 4 options:

hemoglobin molecule with heme groups containing iron atoms in the reduced state to which carbon monoxide molecules are attached

hemoglobin molecule with heme groups containing iron atoms in the reduced state to which oxygen molecules are attached

hemoglobin molecule with heme groups containing iron atoms in the oxidized state to which no oxygen molecules can attach

hemoglobin molecule with heme groups containing iron atoms in the reduced state to which no oxygen molecules are attached

hemoglobin molecule with heme groups containing iron atoms in the reduced state and carbon dioxide molecules attached to amino acid residues of the globin chains

carbaminohemoglobin

carboxyhemoglobin

deoxyhemoglobin

methemoglobin

oxyhemoblobin

Question 5 (1 point)

From the options listed below, select all that are correct with respect to hemoglobin transport of carbon monoxide molecules.

Question 5 options:

carbon monoxide cannot bind to nor be transported by hemoglobin

carbon monoxide is transported by hemoglobin through its binding to amino acid residues in the globin chains of the hemoglobin molecule

carbon monoxide is transported by hemoglobin through its binding to reduced iron atoms of hemoglobin's heme moieties

carbon monoxide is transported by hemoglobin through its binding to oxidized iron atoms of hemoglobin's heme moieties

hemoglobin molecules bind oxygen and carbon monoxide with roughly equal affinity for the two gasses

hemoglobin molecules bind carbon monoxide, but with a much lower affinity than that with which they bind oxygen

hemoglobin molecules bind carbon monoxide, but with a much greater affinity than that with which they bind oxygen

hemoglobin molecules bound with both oxygen and carbon monoxide molecules unload their oxygen to the tissues more easily than do hemoglobin molecules bound only with oxygen

hemoglobin molecules bound with both oxygen and carbon monoxide molecules unload their oxygen to the tissues less readily than do hemoglobin molecules bound only with oxygen

hemoglobin molecules bound with carbon monoxide are called carbaminohemoglobin

hemoglobin molecule with heme groups containing iron atoms in the reduced state to which carbon monoxide molecules are attached

hemoglobin molecule with heme groups containing iron atoms in the reduced state to which oxygen molecules are attached

hemoglobin molecule with heme groups containing iron atoms in the oxidized state to which no oxygen molecules can attach

hemoglobin molecule with heme groups containing iron atoms in the reduced state to which no oxygen molecules are attached

hemoglobin molecule with heme groups containing iron atoms in the reduced state and carbon dioxide molecules attached to amino acid residues of the globin chains

1.

carbaminohemoglobin

2.

carboxyhemoglobin

3.

deoxyhemoglobin

4.

methemoglobin

5.

oxyhemoblobin

Explanation / Answer

Iron of Heme is is ferrous oxidation state (Fe+2). It has two binding sites. To one of these sites, Oxygen binds and the iron of heme comes in ferric Fe+3 oxidation state.

Fe+2 is less oxidised state than Fe+3. So, we can say that heme contains iron in reduced state to which oxygen can bind OR hemoglobin molecule with heme groups containing iron atoms in the oxidized state to which no oxygen molecules can attach

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