Repressors work by causing the rna polymerase to bind tightly to the promoter. a. true b. false

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Alexa is preparing for a presentation by creating note cards identifying keywords that describe various features of each type of plate boundary. which words apply to all three of the convergent boundaries?

Qué sucede cuando una persona tiene muy poco o demasiado costeroides?