15 Questions
Which of the following statements about haemoglobin and myoglobin is correct?
Haemoglobin has more affinity with oxygen than myoglobin.
Where is myoglobin primarily found?
Skeletal muscle cells
What is the main function of haemoglobin?
Transporting oxygen throughout the body
True or false: Haemoglobin consists of one polypeptide chain.
False
True or false: Myoglobin can bind to four oxygen molecules.
False
True or false: Myoglobin has less affinity with oxygen than haemoglobin.
False
Haemoglobin consists of ______ polypeptide chains
four
Each molecule of haemoglobin has ______ iron-containing haem groups
four
Four ______ molecules can bind to each molecule of haemoglobin
oxygen
Compare the number of polypeptide chains in haemoglobin and myoglobin. How does this difference contribute to their distinct functions in the body?
Haemoglobin consists of four polypeptide chains, while myoglobin consists of one polypeptide chain. This difference allows haemoglobin to transport oxygen throughout the body, while myoglobin stores oxygen within muscle tissues.
Explain the difference in oxygen affinity between haemoglobin and myoglobin. How does this difference affect their ability to bind and release oxygen?
Haemoglobin has less affinity with oxygen, meaning it releases oxygen more readily. It loses oxygen at a partial pressure of oxygen (PO2) of 60 mmHg. On the other hand, myoglobin has more affinity with oxygen, meaning it holds onto oxygen more tightly. It loses oxygen at a PO2 of 20 mmHg.
What are the main functions of haemoglobin and myoglobin in the body? How do these functions differ?
Haemoglobin is responsible for transporting oxygen throughout the body, while myoglobin primarily stores oxygen within muscle tissues. The differences in oxygen affinity and oxygen release between haemoglobin and myoglobin contribute to their distinct functions.
Match the following statements about haemoglobin and myoglobin with their correct oxygen affinity:
Haemoglobin = Less affinity, releases oxygen at a PO2 of 60 mmHg Myoglobin = More affinity, holds onto oxygen more tightly and loses it at a PO2 of 20 mmHg
Match the following molecules with their correct oxygen binding capacity:
Haemoglobin = Can bind four oxygen molecules Myoglobin = Can bind only one oxygen molecule
Match the following proteins with their correct primary function:
Haemoglobin = Responsible for oxygen transport throughout the body Myoglobin = Primarily involved in oxygen storage within muscle tissues
Test your knowledge on the differences between haemoglobin and myoglobin! Compare their structures, iron-containing groups, and oxygen binding capacities in this quiz.
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