Which substance is mainly bound to proteins when it is carried in mammalian blood?
(A) Nitrogenous waste
(B) Carbon dioxide
(C) Lipid
(D) Salt - HSC - SSCE Biology - Question 2 - 2011 - Paper 1
Question 2
Which substance is mainly bound to proteins when it is carried in mammalian blood?
(A) Nitrogenous waste
(B) Carbon dioxide
(C) Lipid
(D) Salt
Worked Solution & Example Answer:Which substance is mainly bound to proteins when it is carried in mammalian blood?
(A) Nitrogenous waste
(B) Carbon dioxide
(C) Lipid
(D) Salt - HSC - SSCE Biology - Question 2 - 2011 - Paper 1
Step 1
Identify the Context
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Answer
In mammals, specific substances are carried in the bloodstream, often bound to plasma proteins. Understanding which substances have this characteristic is key to answering the question.
Step 2
Analyze the Options
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Answer
We have four options to consider:
Nitrogenous waste: Typically excreted through the kidneys and not primarily bound to proteins in blood.
Carbon dioxide: This is carried in the blood primarily as bicarbonate (HCO₃⁻) but can also be bound to hemoglobin and plasma proteins.
Lipid: Generally transported by lipoproteins, which are complex structures that include proteins but do not imply they are 'mainly bound' as described.
Salt: The term here is ambiguous but usually refers to ions like sodium or potassium, which do not bind to proteins in the manner the question suggests.
Step 3
Select the Correct Option
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Answer
Among the options, (C) Lipid is the correct answer. Although lipids are transported via lipoproteins, they signify the main substance associated with protein binding in mammalian blood.
