Penicillin is an irreversible inhibitor of the transpeptidases that catalyze the reactions that give the cell walls of some bacteria their rigidity. The antibiotic ________.
a) works by fitting into the active sites of these enzymes forming a covalently bound complex
b) works by sitting into the regulatory sites of these enzymes
c) does not compete for binding to the enzymes active site
d) none of the choices is correct
Ans: a) works by fitting into the active sites of these enzymes forming a covalently bound complex
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Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white, terminal flowers; all F1 individuals have red, axial flowers. The genes for flower color and location assort independently
If 1000 F2 offspring resulted from the cross, approximately how many of them would you expect to have red, terminal flowers? A) 65 B) 190 C) 250 D) 565 E) 750
Autotrophy has been observed among the ________.
A. cyanobacteria B. extreme thermophiles C. methanogens D. All of the choices are correct.
The allele underlying sickle-cell disease affects the structure of the ____ molecule inside cells
Fill in the blank with the appropriate word.
Where did humans first appear?
A) South America B) Africa C) Asia D) Europe