The passage describes carbohydrates in living organisms.
Complete the passage by writing a suitable word in each blank space.
Carbohydrates are organic molecules containing the elements carbon, hydrogen, and (1) ‾\underline{\quad\quad\quad\quad\quad}. The simplest carbohydrates are monosaccharides, such as glucose, which can be joined together by (2) ‾\underline{\quad\quad\quad\quad\quad} bonds formed during condensation reactions.
Monosaccharides are highly soluble, but storage polysaccharides like starch are (3) ‾\underline{\quad\quad\quad\quad\quad} in water, meaning they do not affect the (4) ‾\underline{\quad\quad\quad\quad\quad} potential of the cell. To test for the presence of reducing sugars, the sample is heated with (5) ‾\underline{\quad\quad\quad\quad\quad} reagent. A positive result is indicated by a colour change from blue to a (6) ‾\underline{\quad\quad\quad\quad\quad} precipitate.
In animals, the primary carbohydrate energy store is (7) ‾\underline{\quad\quad\quad\quad\quad}, which is stored mainly in the liver and (8) ‾\underline{\quad\quad\quad\quad\quad} cells. In plants, carbohydrates also play a major structural role in cell walls, which are made of (9) ‾\underline{\quad\quad\quad\quad\quad}. This molecule consists of long, unbranched chains of β\betaβ-glucose linked together by hydrogen bonds to form strong fibres called (10) ‾\underline{\quad\quad\quad\quad\quad}.
