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What conditions are required for the highest-level transcription of the lac operon? a. Presence of lactose and glucose b. Presence of glucose and absence of lactose Presence of lactose and absence of glucose d. Absence of glucose C. a. C. e. 68. Steroid hormones such as cortisol act on target cells by Inhibiting phosphodiesterase b. Binding to membrane proteins Altering transcription d. Activating adenylyl cyclase Activating enzymes 69. Which of the following is not part of the structure of HIV (outside a host cell)? Capsid DNA RNA d. Envelope Reverse transcriptase o a. b. C. e.

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