Which five statements about hemoglobin and myoglobin structure are true? each iron atom can form six coordination bonds. two of these bonds are formed between iron and oxygen. hemoglobin is a heterotetramer, whereas myoglobin is a monomer. both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom. each hemoglobin or myoglobin molecule can bind four oxygen molecules. molecular oxygen binds reversibly to fe2+ in heme. by itself, heme is not a good oxygen carrier. it must be part of a larger protein to prevent oxidation of the iron atom. heme is composed of an organic protoporphyrin component and a metal atom.

Hemoglobin demonstrates a sigmoidal oxygen dissociation curve because of cooperative binding and the binding of oxygen with the molecule of iron takes place reversibly in heme. The binding of the initial oxygen makes conformation changes in hemoglobin, increasing the further combination of additional oxygen.  

Myoglobin refers to oxygen and iron-binding monomeric protein found in the tissues of the muscles of almost all the mammals. The molecule of myoglobin comprises a solitary heme prosthetic group-administered into a hydrophobic cleft in the protein and therefore, myoglobin can reversibly combine with a single molecule of oxygen. Because of its greater affinity for oxygen, myoglobin demonstrates a hyperbolic oxygen dissociation curve and possesses a simple pattern of binding.  

The following are the true statements:  

1. Heme is not a good oxygen carrier by itself, it must be a component of a larger protein to inhibit oxidation of the iron atom.  

2. Heme comprises an organic protoporphyrin constituent and a metal atom.  

3. Both myoglobin and hemoglobin comprise a prosthetic group known as heme that comprises a central iron atom.  

4. Myoglobin is a monomer, while hemoglobin is a heterotetramer.  

5. A molecule of oxygen combines reversibly with the iron (Fe2+) in heme.  

well we can't tell you because we cant see the time give a screen shot or something.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.