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A strain of Aspergillus was subjected to mutagenesis by X rays, and two tryptophan-requiring mutants ( A and B) were isolated. These tryptophan-requiring strains were plated in large numbers to obtain revertants to wild type. You failed to recover any revertants from mutants A and recovered one revertant from mutant B. This revertant was crossed with a normal wild-type strain. What proportion of the progeny from this cross would be wild type if
a) the reversion precisely reversed the original change that produced the typ- mutant allele?
b) the revertant phenotype was produced by a mutation in a second gene located on a different chromosome (the new mutation suppresses trp-)?
Propose an explanation of why no revertants from mutant A were recovered.
What specific biotechnology application did you choose. What benefits are derived from this application.
What would be the effect on blood pressure and phsiological basis of a blow to the head that damages the vasomotor center.
Also glucose technically doesn't have a carbonyl functional group then because it is broken when the ring structure is formed? Is it a random chance that either alpha or beta glucose is formed.
In an experiment you are studying a neuron that receives synaptic inputs from two other neurons: one from neuron A and one from neuron B. Illustrate a separate graph for each value of Vm.
Is habitat temperature reflected in the genomes? What is presumably connected to thermostability.
Thirteen-year-old Ryan has begun to challenge many of his parents' values and to express his own set of highly idealistic standards. Compare and contrast the explanations for Ryan's behaviour that would be given by Kohlberg and by Erikson.
why The E-amino group of lysine has a pka of 10.5. what fraction of these groups will be protonated in a dilute solution of lysine at pH9.5
How may you use site-directed mutagenesis to determine whether this residue is essential for proton conduction?
The organism you select should be a real one however the evolutionary change in a trait which you explain can be real or fiction. Describe how the change in this trait takes place.
Early in the morning, the black caterpillars rest in a tightly packed group on the east-facing surface of the tent. In mid afternoon, the group is found on the tent under surface, each caterpillar individually hanging from the tent by just a few of i..
Perform a search to find out amino acid sequences of the database similar to the query amino acid sequence supplied. explain a BLAST Search Query Amino Acid Sequence.
The resting potential of a neuron is approximately -60mV. Neurons maintain this electric potential by maintaining a balance of ions inside and outside the membrane. Which of the following is the most significant factor in determining this balance.
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