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Multiple Choice
Which of the following statements about albumin is true?
A
Albumin is the most abundant plasma protein in human blood.
B
Albumin is synthesized mainly in the kidneys.
C
Albumin is a glycoprotein primarily involved in catalyzing metabolic reactions.
D
Albumin functions as a major component of the cell membrane.
Verified step by step guidance
1
Step 1: Begin by understanding what albumin is. Albumin is a type of protein found in the plasma of human blood. It plays a critical role in maintaining oncotic pressure (the pressure exerted by proteins in a blood vessel's plasma) and transporting various substances such as hormones, drugs, and fatty acids.
Step 2: Evaluate the first statement: 'Albumin is the most abundant plasma protein in human blood.' This is correct because albumin constitutes approximately 60% of the total plasma protein content, making it the most abundant plasma protein.
Step 3: Evaluate the second statement: 'Albumin is synthesized mainly in the kidneys.' This is incorrect because albumin is synthesized primarily in the liver, not the kidneys.
Step 4: Evaluate the third statement: 'Albumin is a glycoprotein primarily involved in catalyzing metabolic reactions.' This is incorrect because albumin is not a glycoprotein, nor does it function as an enzyme to catalyze metabolic reactions. Its primary role is transport and maintaining oncotic pressure.
Step 5: Evaluate the fourth statement: 'Albumin functions as a major component of the cell membrane.' This is incorrect because albumin is not a structural component of the cell membrane; it is a soluble protein found in the plasma of blood.