Regarding the trp operon, trpR- maps to a considerable distance from the structural genes. The mutation either inhibits the interaction with tryptophan or inhibits repressor formation entirely
In the presence of tryptophan in the medium, would you expect the trp operon to be transcriptionally active? Explain.
With either of the two scenarios mentioned in the problem, the absence of repressor function in a repressible system means that there would be no repression of the operon. The operon would be transcriptionally active.
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Indicate whether the statement is true or false.
What is the process that can lead to photosynthetic population explosions?
a. Dead zones b. Algal bloom c. Eutrophication d. Water runoff
Of the following is NOT an observation made by Darwin?
a. If the next generation is subjected to the same process of selection, these favourable traits will become less common. b. Individuals within populations vary in size, form, colour, behaviour, and other characteristics. c. Many of these variations are passed on from parent to offspring. d. Some of the inherited variations enable some individuals to survive and reproduce better than others.
How many answers are there to a question in a dichotomous key flowchart?
a. Two b. Any number of answers are possible. c. Four d. Three