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23 April, 16:43

What do all four of these molecules have in common?

A.

They are essential to life.

B.

They carry signals.

C.

They are water soluble.

D.

They act as a source of energy

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Answers (2)
  1. 23 April, 18:20
    0
    A. They are Essential to Life
  2. 23 April, 19:39
    0
    I did a quick search and found the diagram. Let's go through these and solve by elimination.

    B. Proteins can act as receptors which I guess could be considered a signal, but the rest of the molecules do not. B is incorrect.

    C. Lipids are not water soluble. An example of lipids are fats, and oils. Have you ever tried combining water and oil? Think about salad dressing, it does not mix. C is incorrect.

    D. Carbohydrates and lipids are sources of energy, but nucleic acids and proteins are not. D is incorrect.

    The answer is A. because we know that our bodies are made up of nucleic acids, protein, fats, and we need carbohydrates in order to live normal, healthy lives.
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