Multiple Choice
Which of the following molecules can freely pass through the phospholipid bilayer due to their solubility properties?
2. Molecular Representations
How To Determine Solubility
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Which statement accurately describes water-soluble vitamins?
A
They are primarily composed of nonpolar molecules.
B
They are absorbed into the lymphatic system before entering the bloodstream.
C
They are stored in the body's fat tissues and liver.
D
They are excreted in urine and need to be consumed regularly.
Verified step by step guidance1
Understand the nature of water-soluble vitamins: Water-soluble vitamins are those that dissolve in water and are not stored in the body. This means they need to be consumed regularly as they are excreted in urine.
Analyze the statement 'They are primarily composed of nonpolar molecules': Water-soluble vitamins are generally polar, which allows them to dissolve in water. Nonpolar molecules do not dissolve well in water, so this statement is inaccurate.
Evaluate the statement 'They are absorbed into the lymphatic system before entering the bloodstream': This is characteristic of fat-soluble vitamins, not water-soluble ones. Water-soluble vitamins are absorbed directly into the bloodstream.
Consider the statement 'They are stored in the body's fat tissues and liver': This is true for fat-soluble vitamins. Water-soluble vitamins are not stored in the body and are excreted in urine.
Conclude with the correct statement: 'They are excreted in urine and need to be consumed regularly' accurately describes water-soluble vitamins, as they are not stored in the body and must be replenished frequently.
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