How does the ability of ATP to transfer a phosphate group make it pivotal in the overall energy metabolism of a cell? What will be an ideal response?
When ATP is hydrolyzed to ADP + Pi, energy is released which can be used to drive
endergonic reactions in the cell. One way in which this occurs is via phosphorylation
reactions in which the Pi is transferred to another molecule, thus energizing that molecule. In
other cases, the Pi is simply released into the cell in a way that couples the exergonic
hydrolysis of ATP with an endergonic reaction. The central role of ATP in metabolism is
shown in Fig. 7-6. That is, some of the energy released in exergonic reactions can be used to
phosphorylate ADP forming ATP. The energy thus stored in ATP can be released at a later
time when ATP is hydrolyzed.
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Colonies of Streptococcus pneumoniae appear ?-hemolytic on blood agar media. Which one of the following statements explains this discrepancy?
a. The lot of blood agar may be expired. b. Something may be wrong with the strain of S. pneumoniae since it should be ?-hemolytic on blood agar. c. Something may be wrong with the strain of S. pneumoniae; it should be ?-hemolytic on blood agar. d. No discrepancy is present. S. pneumoniae should be ?-hemolytic on blood agar.
To a large extent, a protein's function is dependent upon its shape. What determines a protein's shape?
A. The number of amino acids B. The sequence of amino acids C. The location of the active site D. The number of peptide bonds
A visible red streak in an infected hand or foot is referred to as
A. septicemia. B. bacteremia. C. lymphangitis. D. edema.
Which of the following traits is not characteristic of insects?
a. six legs b. three-part body plan c. complete digestive system d. most species are hermaphrodites