The fertilization process of flowering plants involves ____ nuclear fusion(s)
a. one
b. two
c. single
d. multiple
e. incomplete
b
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Which of these statements is true of the energy in an open system containing living organisms?
a. The system will quickly settle into equilibrium. b. This system will generate a net surplus of energy. c. There must be a net influx of energy to this system. d. Energy transfers cannot be tracked in open systems.
The table below lists several genotypes associated with the lac operon in E. coli. For each, indicate with a "+" or a "-" whether functional ?-galactosidase would be expected to be produced at induced levels
?-Galactosidase Production Genotype No Lactose With Lactose (a) I + O+ Z+/F' I - O+ Z+ (b) I - Oc Z+/F' I - O+ Z- (c) I s Oc Z+/F' I + O+ Z+ (d) I - O+ Z+/F' I - O+ Z+ I + = wild-type repressor I - = mutant repressor (unable to bind to the operator) I s = mutant repressor (insensitive to lactose) O+ = wild-type operator Oc = constitutive operator (insensitive to repressor)
What part of the bacterial ribosome has peptidyl transferase activity?
a. a protein in the 30S ribosomal subunit b. 23S rRNA c. a protein in the 50S ribosomal subunit d. 16S rRNA e. 5S rRNA
________ is the total energy change that accompanies a chemical reaction.
A. Enthalpy B. Free energy C. Synergy D. Entropy