A self-regenerating action potential generally depends on opening of _______ channels.
Fill in the blank(s) with the appropriate word(s).
Answer: voltage-gated Na+
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Pollination is an example of a(n) ________ relationship
a. interspecific competition b. mutualistic c. predatory d. parasitoid e. commensalistic
Platelets function to engulf foreign cells by phagocytosis
Indicate whether the statement is true or false
Match each hormone secreted by the pituitary gland with the target tissue or gland that acts on.
(a) Describe by labeled diagram the structural components of the lac operon in E. coli
(b) State the function of the lac regulator gene. (c) State the function of ?-galactosidase in the lac system. (d) Show by diagram the manner in which lactose brings about transcription of the three structural genes of the lac operon. (e) Explain why certain mutations in the regulator gene (I?) of the lac system result in maximal synthesis of ?-galactosidase, permease, and transacetylase even in the absence of the inducer (lactose). What will be an ideal response?