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
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).
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.