Which of the following biological molecules are composed of amino acid subunits?
A) Carbohydrates B) Nucleic acids C) Lipids D) Proteins
D
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In human cells such as muscle tissue, the product of anaerobic respiration is:
A. acetic acid. B. pyruvate. C. lactic acid. D. FADH2. E. ethanol.
Isolates from cerebrospinal fluid (CSF) or respiratory tract specimens that are gram-negative coccobacilli grow on chocolate agar in CO2 but not on blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. Haemophilus parahaemolyticus. c. H. haemolyticus. d. H. influenzae.
Salt marsh plants play an important role in expanding the terrestrial environment
Indicate whether the statement is true or false
Protein kinases are enzymes that transfer the terminal phosphate from ATP to an amino acid residue on the target protein. Many are located on the plasma membrane as integral membrane proteins or peripheral membrane proteins
What purpose may be served by their plasma membrane localization? A) ATP is more abundant near the plasma membrane. B) They can more readily encounter and phosphorylate other membrane proteins. C) Membrane localization lowers the activation energy of the phosphorylation reaction. D) They flip back and forth across the membrane to access target proteins on either side.