Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to
A) the active site of an allosteric enzyme that binds to a specific substrate.
B) tRNA specifying which amino acids are in a polypeptide.
C) a metabolic pathway operating within a specific organelle.
D) an enzyme having an optimum pH and temperature for activity.
E) an antibody in the immune system
Ans: A) the active site of an allosteric enzyme that binds to a specific substrate.
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The Law of Thermodynamics that states that energy cannot be created or destroyed is:
A. The First Law of Thermodynamics B. The Second Law of Thermodynamics C. The Third Law of Thermodynamics D. The Fourth Law of Thermodynamics
ATP is a nucleotide composed of adenine ____ , and three phosphate groups
Fill in the blank with the appropriate word.
Which discovery supports the hypothesis that evolution of the lactase-persistence trait was driven by the use of milk in pastoralist cultures?
A. The lactase gene is present both in humans and in domesticated animals B. Ancient pots used to hold milk are about the same age as the lactase persistence mutations. C. Most human cultures today drink milk and most people worldwide are lactase persistent. D. Scientists have identified different mutations that cause lactase persistence.
Which of the following is found in both Gram (+) and Gram (-) cell walls?
A. an outer membrane B. Peptidoglycan C. Lipopolysaccharide