For the following gene you notice the following results mutant deletion region transcription lungs transcription kidneys wt none 100 100 1 1 200 130 130 2 250 400 100 100 3 500 800 50 50 4 950 1100 0 100a. what type of sequence has been mutated in mutant 3? b. what type of sequence has been mutated in mutant 4?

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.