A strain with a nonfunctional ________ protein would generate many mutations because the error-prone SOS system would never be repressed
a. RecA
b. LexA
c. HisC
d. DNA polymerase IV
Answer: B
You might also like to view...
In mammals, the binding of an antigen to a
cell’s receptors directly activates
a. complement proteins. b. adaptive immunity. c. PAMPs. d. genes on DNA. e. killer T cells
The largest grouping within a phylum is a
A. class. B. order. C. kingdom. D. family.
All EXCEPT which of the following have
cartilaginous skeletons? a. sharks b. lampreys c. perch d. Manta rays e. stingrays
Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets with favorable conditions for life are
a. G to K main-sequence stars. b. B to A main-sequence stars. c. G to K giants. d. white dwarf stars e. neutron stars.