In the lac operon, what occurs in the presence of lactose?
The same thing occurs in the presence and absence of lactose in the lac operon.
Lactose binds to the repressor protein, allowing RNA polymerase to bind to the operator, and transcription occurs.
Lactose binds to RNA polymerase and transcription cannot occur.
Lactose binds to RNA polymerase, RNA polymerase becomes activated, and transcription occurs.
A repressor protein competes with lactose for a position on the operator, thus making transcription a competitive process.
Lactose binds to the repressor protein, allowing RNA polymerase to bind to the operator, and transcription occurs.
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Which biome is located where a freshwater river meets an ocean?
a. estuary b. stream c. source water d. channel
Which of the following is true of all animals?
1.All animals exhibit bilateral symmetry. 2.All animals are multicellular and heterotrophic. 3.Protostomes have a coelom but deuterostomes have a pseudocoel. 4.Animals most likely evolved from cyanobacteria.
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A) mastodon B) Irish elk C) pygmy armadillo D) giant vampire bat E) Arctic lemming