Protein Function

Question 1

How are myoglobin and hemoglobin different in their structures?

Answer 1

Myoglobin:
* Mononmer
* 1 polypeptide chain (154 aa and 1 domain)
* Only a tertiary structure
Hemoglobin:
* Oligomer
* 4 polypeptide chains (each has 1 domain)
* has quaternary structure

Question 2

What do red blood cells do in capillaries?

Answer 2

Hemoglobin (a protein within RBCs) binds to O2 in the lungs and releases it in the tissues

Question 3

Four functions of myoglobin

Answer 3

1. Acts as a local reserve of O2 during intense exercise
2. Store O2 in aquatic animals
3. Facilitates O2 diffusion through muscle tissue
4. Inactivates NO and scavenging reactive O2 species

Question 4

Where are hemoglobin and myoglobin found in the body?

Answer 4

Hemoglobin: RBC cells (transporter)
Myoglobin: Striated muscles (receiver)

Question 5

Define

Ligand

Answer 5

ions or neutral molecules that bond to a central metal atom or ion

Question 6

The greater affinity of X for Y the ____ XY we will have at any [] of Y or X

Answer 6

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