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Magazine Problem 1
_____ is life's primary source of energy. a. Food b. Water c. Sunlight d. ATP
Problem 2
Energy _____. a. cannot be created or destroyed b. can change from one form to another c. tends to disperse spontaneously d. all of the above
Problem 3
If we liken a chemical reaction to an energy hill, then an ______ reaction is an uphill run. a. energy-requiring b. energy-releasing c. ATP-assisted d. both a and \(c\)
Problem 4
_____ are always changed by participating in a reaction. (Choose all that are correct.) a. Enzymes b. Cofactors c. Reactants d. Intermediates
Problem 5
Enzymes _____. a. are proteins, except for a few RNAs b. lower the activation energy of a reaction c. are changed by the reactions they catalyze d. a and b
Problem 6
Which of the following statements is not correct? A metabolic pathway _____. a. is a sequence of enzyme-mediated reactions b. may build or break down molecules c. generates heat d. can include an electron transfer chain e. none of the above
Problem 7
Diffusion is the movement of ions or molecules from a region where they are _____ (more/less) concentrated to another where they are (more/less) concentrated.
Problem 8
Name one molecule that can readily diffuse across a lipid bilayer.
Problem 9
Some sodium ions cross a cell membrane through transport proteins that first must be activated by an energy boost. This is an example of _____. a. passive transport b. active transport c. facilitated diffusion d. a and c
Problem 10
Immerse a living cell in a hypotonic solution, and water will tend to _____. a. move into the cell b. move out of the cell c. show no net movement d. move in by endocytosis
