Amutant strain of e. coli produces β-galactosidase in the presence and in the absence of lactose. where in the operon might the mutation in this strain occur and why? a-in the operator region, where the mutation leads to the failure of the operator to normally bind the repressor b-in the cap binding site, where the mutation leads to the inefficiency of rna polymerase activity c-in the promoter region of the operon, where the mutation leads to the failure of the rna polymerase to bind to the promoter d-near the laci gene, where the mutation leads to increased levels of lac repressor being made e-in the laci gene, which leads to an inactive lac repressor f-in the operator region, which leads to increased binding of the lac repressor to the operator
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Biology, 22.06.2019 03:30, gaby6951
Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.
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Biology, 22.06.2019 07:00, kaperry
Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.
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Amutant strain of e. coli produces β-galactosidase in the presence and in the absence of lactose. wh...
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