Question

1. what gives rise to the cohesiveness of water molecules? a) hydrophobic interactions b) hydrogen bonds c) nonpolar covalent bonds d) ionic bonds e) both a and c 26) polysaccharides, nucleic acids, and proteins are similar in that they a) are synthesized from monomers by dehydration reactions. b) are decomposed into their subunits by dehydration reactions. c) are synthesized as a result of peptide bond formation between monomers. d) all contain nitrogen in their monomer building blocks. e) are synthesized from monomers by the process of hydrolysis. 27) which of the following solutions has the greatest concentration of hydroxide ions, oh-? a) tomato juice at ph 4 b) seawater at ph 8 c) vinegar at ph 3 d) urine at ph 6 e) lemon juice at ph 2

Explanation:

Question 25:

Hydrogen bonds are responsible for the cohesiveness of water molecules. Hydrophobic interactions involve non - polar substances and water separation, non - polar covalent bonds are within non - polar molecules, and ionic bonds are between ions.

Question 26:

Polysaccharides, nucleic acids, and proteins are synthesized from monomers by dehydration reactions (also called condensation reactions), which release water as a by - product. Hydrolysis reactions break them down into subunits, peptide bonds form only in proteins, and not all of these polymers have nitrogen in their monomers (e.g., polysaccharides don't).

Question 27:

The relationship between pH and $[OH^-]$ is inverse. The higher the pH, the greater the concentration of hydroxide ions. Among the given options, seawater with a pH of 8 has the highest pH.

Answer:

1. B. hydrogen bonds
2. A. are synthesized from monomers by dehydration reactions.
3. B. seawater at pH 8