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
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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.
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
All EXCEPT which of the following have
cartilaginous skeletons? a. sharks b. lampreys c. perch d. Manta rays e. stingrays
The largest grouping within a phylum is a
A. class. B. order. C. kingdom. D. family.