What would be the phenotype of an int? mutant?
A) The phage would not be able to undergo the lytic cycle, but could lysogenize.
B) Both lytic and lysogenic pathways would be inactivated.
C) The phage would be able to enter the lytic cycle, but would not be able to lysogenize.
D) The phage would be able to lysogenize but would not be able to be induced to resume the lytic cycle.
E) The cell would build up high levels of repressor, so lysogeny would be maintained.
C
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When comparing genes from Archaea, Bacteria, and Eukarya, which statement is TRUE?
A) Almost all archaeal genes are more similar to eukaryotic genes than to bacterial genes. B) Almost all archaeal genes are more similar to bacterial genes than to eukaryotic genes. C) Genes in Archaea involved in DNA replication, transcription, and translation are more similar to those of Eukarya, while those encoding metabolic functions other than information processing are more similar to those of Bacteria. D) Archaeal genes are almost universally unique; very few are similar to either eukaryotic or bacterial genes.
The causative agent of plague is
A. Vibrio cholerae. B. Staphylococcus aureus. C. Brucella abortus. D. Yersinia pestis.
In the countercurrent exchange in a fish's gills, the oxygen concentration is always _______ in the water than the blood along the entire pathway of each lamella.
A. higher B. the same C. lower
Expression of a(n) ________ alters gene transcription in E. coli by activating transcription of specialized heat stress response genes
Fill in the blank(s) with correct word