Question

carbon can combine with other molecules to form large macromolecules such as complex carbohydrates, proteins, nucleic acids, and lipids. which of the following is not a function of biological macromolecules?
biological macromolecules transmit signals between cells.
biological macromolecules form structures in cells.
biological macromolecules store and transmit genetic information.
biological macromolecules are used to store energy.
biological macromolecules are solvents that can dissolve many ionic compounds and polar molecules.
clear selection
water is an excellent solvent. select the property that justifies this statement.
it forms ionic bonds with ions, hydrogen bonds with polar molecules, and hydrophobic interactions with nonpolar molecules.
it is liquid and will adhere to many substances
it forms hydrogen bonds with itself so cohesion is possible.
as a polar molecule, it can surround and dissolve ionic and polar molecules

Explanation:

• For the first question:
• Proteins (a type of biological macromolecule) can transmit signals between cells (e.g., hormones like insulin).
• Proteins and lipids form structures in cells (e.g., cell membranes have lipid bilayers and membrane - bound proteins).
• Nucleic acids (DNA and RNA) store and transmit genetic information.
• Carbohydrates (e.g., glycogen in animals, starch in plants) and lipids (e.g., triglycerides) are used to store energy.
• Water, not biological macromolecules, is the solvent that can dissolve many ionic compounds and polar molecules.
• For the second question:
• Water is a polar molecule. The oxygen atom has a partial negative charge (\(\delta-\)) and the hydrogen atoms have partial positive charges (\(\delta+\)).
• For ionic compounds, the polar water molecules can interact with the ions. The negative end of the water molecule (\(\delta-\)) is attracted to cations (\(+ \) ions), and the positive end (\(\delta+\)) is attracted to anions (\(-\) ions).
• For polar molecules, water can form hydrogen bonds (a type of dipole - dipole interaction) with them. Non - polar molecules do not dissolve well in water (hydrophobic effect).
• The property of being a polar molecule (not just being liquid, or cohesive) is what makes it an excellent solvent for ionic and polar molecules.

Answer:

• First question: Biological macromolecules are solvents that can dissolve many ionic compounds and polar molecules.
• Second question: As a polar molecule, it can surround and dissolve ionic and polar molecules.