13) What happens to the rate of an enzyme-substrate catalyzed reaction if the concentration decreases continuously? a. decreases and then increases rapidly b. increases and then decreases rapidly c. increases and then levels off d. decreases and then levels off 14) Which molecules are the major components of proteins? a. carbon, hydrogen, and oxygen b. carbon, nitrogen, and hydrogen c. oxygen, nitrogen, sulfur, and hydrogen d. carbon, hydrogen, oxygen, nitrogen, and sulfur 15) Proteins do not serve what function within the cell? a. structural support b. antibodies c. transport DNA outside the cell d. make up enzymes that speed up chemical reactions 16) What is true about pH? a. acids are a pH less than 7 b. bases are a pH greater than 7 c. water is a pH of 7 d. pH is a scale of how basic or acidic a solution is e. all of the above are true 17) A protein's side chain can be characterized by what? a. nonpolar hydrophobic, neutral (uncharged) but polar b. acidic with a negative charge and basic with a positive charge c. hydrophobic, acidic with a negative charge and basic with a positive charge d. a and b 18) How are oxygen and carbon dioxide exchanged across a lung cell membrane? a. active transport b. facilitated diffusion c. osmosis d. diffusion 19) The base pairs of a DNA molecule are held together by which of the following? a. hydrogen bonds b. phosphodiester linkages c. peptide linkages d. ester linkages 20) How many functional groups are present in this aspirin molecule, shown in the following diagram? a. 2 b. 3 C. 4 d. 5 H₂C. HO

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I have a questionHeadache is a symptom What could be a sign for a patient with a headache? Please help