In a reversible reaction at equilibrium, the concentration of R (the reactant) is 3.0 mol/L and the concentration of P (the product) is 0.9 mol/L. At 25°C, what would be the Keq?
A) 1.5
B) 0.3
C) 1.0
D) 3.0
E) 37.5
B) 0.3
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Successful insertion of a DNA fragment into the polylinker region of pBluescript II is detected by
A) production of the enzyme ?-galactosidase. B) absence of the enzyme ?-galactosidase. C) the increased size of the plasmid. D) autoradiography. E) None of these
By what means are amino acids absorbed by the small intestine?
a. diffusion b. facilitated diffusion c. osmosis d. passive transport e. active transport
The limitation on microbial growth rate at high nutrient levels is/are ________.
A. the saturation of the transport proteins for nutrient uptake B. the rate of DNA replication C. the rate of protein synthesis D. All of the choices are correct.
________ molecules deliver amino acids to ribosomes during translation.
A. Messenger RNA (mRNA) B. Ribosomal RNA (rRNA) C. Transfer RNA (tRNA) D. Heterogeneous nuclear RNA (hnRNA)