Due 10/04 Weekly Recap Quiz 9 (Bio A) 8 of 108 of 10 Items Question POSSIBLE POINTS: 1 Click to select the correct answers. Click again to unselect answers. Leave the incorrect answers unselected All living things are made up of four classes of biological macromolecules: carbohydrates, lipids, proteins, and nucleic acids. Macromolecules are large molecules composed of thousands of covalently connected atoms, also called polymers. A polymer is a long molecule consisting of many similar building blocks; the small building-block molecules are called monomers. All cells have thousands of different macromolecules, that vary among cells of an organism, vary more within a species, and vary even more between species. A huge variety of polymers can be built from a small set of monomers. What statements are true about the biological macromolecules. (Choose 3) Responses All biomolecules could be called carbon-based molecules. All biomolecules could be called carbon-based molecules. The monomers of DNA are nucleotides. The monomers of DNA are nucleotides. Ready cellular energy comes in the form of lipids. Ready cellular energy comes in the form of lipids. Carbohydrates contain nitrogen and therefore differ from the other macromolecules Carbohydrates contain nitrogen and therefore differ from the other macromolecules Cell membranes are made, in part, from phospholipids.

Answer 1

Based on the information you've provided, the correct statements about biological macromolecules are:

1. All biomolecules could be called carbon-based molecules.
   This statement is true because all biological macromolecules contain carbon atoms.

2. The monomers of DNA are nucleotides.
   This is also true, as nucleotides are the building blocks (monomers) of DNA.

3. Cell membranes are made, in part, from phospholipids.
   This statement is true as well; phospholipids are a major component of cell membranes.

The incorrect statement is:

• Ready cellular energy comes in the form of lipids.
  This is misleading because while lipids can be a source of energy, the readily usable form of energy for cells is generally glucose, a carbohydrate, rather than lipids.

• Carbohydrates contain nitrogen and therefore differ from the other macromolecules.
  This is not true; carbohydrates do not typically contain nitrogen; they mainly consist of carbon, hydrogen, and oxygen.

So, the three true statements are the first three mentioned above.