In one experiment, mice were genetically engineered to overexpress a particular set of miRNAs. These animals developed lymphomas. The genes encoding these miRNAs were acting as _________.
a) tumor suppressors
b) sex-linked dominant alleles
c) holandric genes
d) oncogenes
Ans: d) oncogenes
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If extinction is a natural process that occurs on an ongoing basis, how do extinctions occurring now differ from those of any other mass extinction periods?
What will be an ideal response?
In Jacob and Monad’s analysis of mutant E. coli strains in their study of the lac operon, the absence of the ?-
galactosidase enzyme, but presence of the lactose permease and galactosidase transacetylase enzymes, indicated that the mutation occurred in the _____ of the lac operon. a. regulatory region b. lacZ gene c. lacA gene d. lacY gene e. heterochromatin
A plant grows taller through ________, which involves cell division in the ________
A) primary growth... vascular cambium B) secondary growth... vascular cambium C) primary growth... apical meristem D) secondary growth... cork cambium
The amphibian kidney is identical to that of
A. insects. B. marine fish. C. freshwater fish. D. birds. E. humans.