The lac repressor protein is bound to the operator region of the lac operon when there is no lactose in the medium. When introduced in lactose, it binds to an allosteric site on the repressor causing its to change conformation and release from the operator. This allows the polymerase that is bound to the promoter region to proceed transcription of the lac operon genes (LacZ, Lac A, and Lac Y). Translation of these genes forms enzymes that enable the organism to break down lactose for energy.
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➷ The correct option is A. 2, 4, 1, 3, 5
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First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst. hope this helps :)
Answer:
option D
Explanation:
When an organism is heterozygous for a particular trait, it means the organism has two different allele for that particular trait. An allele is the alternate for of a gene. For example, using Mendel's pea plants, he studied the height trait having the tall and the short allele for this height trait. Thus, this cn be written as (Tt) where T represent the tall allel and t represent the short allele.
Scant or non tonsillar exudate
slight erythema of the pharynx and tonsils
