If E. coli bacteria are grown in the absence of lactose, then the repressor will
A. not bind the operator, allowing transcription of the lac operon genes.
B. bind the operator, allowing transcription of the lac operon genes.
C. not bind the operator, preventing transcription of the lac operon genes.
D. bind the operator, preventing transcription of the lac operon genes.
D. bind the operator, preventing transcription of the lac operon genes.
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One feature that amphibians and humans have in common is _____
A) the number of heart chambers B) the type of gas exchange tissues C) a complete separation of circuits for circulation D) the number of circuits for circulation E) a low blood pressure in the systemic circuit
The female sexual response has a refractory period
Indicate whether the statement is true or false.
Vocal signals are used by _____
a. wolves b. mice c. snakes only d. lizards only e. snakes and lizards
Analysis of marsupial embryos have found that neural crest cells begin their migration earlier in marsupials than in other mammal groups, thus allowing marsupials to being using their mother's milk at an earlier age than other mammals
This is an example of: a. neofunctionalization. c. heterochrony. b. homeotic transformation. d. subfunctionalization.