Which of the following mutations is dominant over wild-type lacI+ in a partial diploid experimental cell?
A) lacA-
B) lacO-
C) lacI-
D) lacIS
E) C and Donly
D
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Adenylyl cyclase is to cAMP as ________ is to IP3.
A. protein kinase A B. protein kinase C C. calmodulin D. Raf1 E. phospholipase C
A tRNA with the anticodon sequence 5? IUA 3? will not normally exist because
A) 5? UAA 3? is a stop codon. B) I is not a base present in tRNAs. C) it will recognize codons for different amino acids. D) 5? UAU 3? and 5? UAC 3? both specify tyrosine.
When a population has inhabited an area for a long time and the population size has stabilized, then
A) the environmental resistance declines. B) density-independent factors are involved. C) the carrying capacity of the area has been reached. D) predation decreases. E) density dependence is clearly not involved in the population growth.
The biologically available carbon that is produced within large, lentic rivers and lakes is called ________.
Fill in the blank(s) with the appropriate word(s).