Penicillin stops bacterial cell wall formation by
A) inhibition of a transpeptidase.
B) inhibiting synthesis of NAM.
C) inhibiting synthesis of NAG.
D) inhibiting transport of NAG and NAM past the permeable membrane.
A) inhibition of a transpeptidase.
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The epithelial cells in the skin of an animal have 24 chromosomes. How many chromosomes are present in the gametes of this animal?
A. 6 B. 12 C. 24 D. 48
How does an enzyme work to catalyze a reaction?
A. It raises the temperature of a reaction. B. It lowers the activation energy of a reaction. C. It allows the reaction to proceed through different intermediates. D. It supplies the energy to speed up a reaction. E. It increases the concentration of the reactants in a reaction.
ATP for muscle contraction can be formed by _____
a. aerobic respiration c. creatine phosphate breakdown b. lactate fermentation d. all of these
The reason that cellular slime molds are being used to study the evolution of the immune system is because
A. the slug is capable of preventing pathogens from being able to infect it. B. cells within the single-celled slug will perform specialized function similar to that of neutrophils and macrophages. C. cells within the multicellular slug will perform specialized function similar to that of neutrophils and macrophages. D. cells within the multicellular slug will perform specialized function similar to that of red blood cells. E. None of these reasons are why cellular slime molds are being used for studying the evolution of the immune system.