Chapter 5, Problem 3SC

________ are always changed by participating in a reaction. a. Enzymes c. Reactants b. Cofactors d. Coenzymes

The hormone insulin enhances the transport of glucose (sugar) from the blood into most body cells. Its secretion is controlled by a negative-feedback system between the concentration of glucose in the blood and the insulin-secreting cells. Therefore, which of the following statements is correct? A decrease in blood glucose concentration stimulates insulin secretion, which in turn further towers blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn lowers blood glucose concentration. A decrease in blood glucose concentration stimulates insulin secretion, which in turn increases blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn further increases blood glucose concentration. None of the preceding is correct.

Dixie Bee wanted to make JELL-O shots for her next party, but felt guilty about encouraging her guests to consume alcohol. She tried to compensate for the toxicity of the alcohol by adding pieces of healthy fresh pineapple to the shots, but when she did, the JELL-O never solidified. What happened? Hint: JELL-O is mainly sugar and a gelatinous mixture of proteins.

Match each type of molecule with its description. _________ chain of amino acids _________ energy carrier _________ glycerol, fatty acids, _________ phosphate _________ chain of nucleotides _________ one or more sugar units a. carbohydrate b. phospholipid c. protein d. DNA e. ATP

What convenient form of chemical energy is used by all cells?

An example of a monosaccharide is ________. a. fructose b. glucose c. galactose d. all of the above

Which molecule does not form during glycolysis? a. NADH c. oxygen (O2) b. pyruvate d. ATP