Jacob and Monod proposed a unified hypothesis of gene regulation. Which of the following is/are NOT part of the hypothesis?

a) Operons contain regulatory elements that control the expression of contiguous genes.

b) Repressors and operators regulate messenger RNA.

c) Transcription is regulated specifically at the level of initiation.

d) All of the listed statements are part of the hypothesis.

Match the types of competition to their descriptions

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Approximately percent of the energy created by cell metabolism is used by the body to carry on its normal functions, such as respiration, digestion, reproduction, muscular movement, circulation, and cellular regrowth.