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klemol [59]
3 years ago
8

Which five statements about hemoglobin and myoglobin structure are true? Each iron atom can form six coordination bonds. One of

these bonds is formed between iron and oxygen. By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom. Molecular oxygen binds irreversibly to Fe2+ in heme. Heme is composed of an organic protoporphyrin component and a metal atom. Hemoglobin and myoglobin are heterotetramers. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom. Each hemoglobin molecule can bind four oxygen molecules; each myoglobin can bind only one oxygen molecule.
Chemistry
2 answers:
Ulleksa [173]3 years ago
7 0

Answer:

Here's what I get  

Explanation:

Each iron atom can form six coordination bonds. One of these bonds is formed between iron and oxygen.  

TRUE

By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom.  

TRUE

Molecular oxygen binds irreversibly to Fe²⁺ in heme.  

False. It binds reversibly with heme.

Heme is composed of an organic protoporphyrin component and a metal atom.  

TRUE

Hemoglobin and myoglobin are heterotetramers.

False. Hemoglobin is a tetramer. Myoglobin a monomeric protein.

Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.

TRUE

Each hemoglobin molecule can bind four oxygen molecules; each myoglobin can bind only one oxygen molecule.

TRUE

____ [38]3 years ago
6 0

Answer:

1.  Each iron atom can form six coordination bonds. One of these bonds is formed between iron and oxygen

2.By itself heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom.

3.Each hemoglobin molecule can bind four oxygen molecules; each myoglobin can bind only one oxygen molecule.

4. Heme is composed of an organic protoporphyrin component and a metal atom.

5.  Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.

Explanation:

Myoglobin is a protein that is muscle tissues, it functions as an oxygen storage unit. Hemoglobin is found in the fed blood dells, it functions as an oxygen transporter. It transport oxygen from the lungs to the rest of the body.

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arsen [322]
Answer:
hydrochloric acid reacts with sodium hydroxide to form sodium chloride (the salt) and water.

Explanation:
Sodium chloride is made up of Na+ cations from the base (NaOH) and CI-anions from the acid (HCI).

Hope this helped!
4 0
2 years ago
Given the following equation,
VARVARA [1.3K]

Answer:

5 moles

Explanation:

Given data:

Number of moles of HCl = 5 mol

Number of moles of H₂O produced = ?

Solution:

Chemical equation:

HCl + NaOH     →   NaCl + H₂O

Now we will compare the moles of HCl with H₂O.

                          HCl            :           H₂O

                             1               :             1

                             5               :            5

5 moles of water will be produced.

7 0
3 years ago
Predict the mass of iron (III) sulfide produced when 3.0 g of iron filings react completely with 2.5 g of yellow sulfur solid, S
gladu [14]

The complete balanced chemical reaction to this would be:

<span>2 Fe  +  3/8 S8  -->  Fe2S3</span>

 

First convert mass into number of moles.

moles Fe = 3 g / (55.845 g/mol) = 0.05372 mol Fe

moles S8 = 2.5 g / (256.52 g/mol) = 0.0097458 mol S8

 

Then we find the limiting reactant. The limiting reactant is the one which has lower (moles/coefficient) ratio.

Fe = 0.05372 / 2 = 0.02686

S8 = 0.0097458 / (3/8) = 0.02599

 

So since S8 has lower ratio, therefore it is the limiting reactant so we base our calculation from it. From the reaction, we get 1 mole of Fe2S3 for every 3/8 mol of S8, therefore:

moles Fe2S3 = 0.0097458 mol S8 * (1 mole Fe2S3 / 3/8 mol S8)

moles Fe2S3 = 0.02599 mol

 

The molar mass of Fe2S3 is 207.9 g/mol, so the mass is:

mass Fe2S3 = 0.02599 mol * 207.9 g/mol

<span>mass Fe2S3 = 5.4 grams</span>

3 0
2 years ago
Read 2 more answers
What isn’t considered a key component of fire?
OverLord2011 [107]

Carbon Dioxide I think. It would help if I knew the choices.

7 0
3 years ago
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Kitchen Math: Measuring

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10. Measuring tools you find in almost every kitchen are timers, thermometers and measuring containers.

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12. When measuring dry ingredients, you want to dip, scoop and scrape.

13. If your recipe calls for sifted flour, sift it before you measure.

14. Brown sugar, cooked rice and chopped parsley need to be packed down in measuring cups

15. When measuring liquids, get down at eye level.

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3 0
2 years ago
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