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A mutation in DNA generates a UGA stop codon in the middle of the RNA coding for a particular protein. A second mutation in the cell leads to a single nucleotide change in a tRNA that allows the correct translation of the protein, that is, the second mutation "suppresses" the defect caused by the first. What nucleotide change has probably occurred in the mutant tRNA molecule? What consequences would the presence of such a mutant tRNA have for the translation of the normal genes in this cell?
Methods for Assaying/Detecting Viruses, Write a paragraph to teach to the rest of the class one of the following techniques used to assay/detect a virus.
Who wrote the essay that inspired both Darwin and Wallace to develop the theory of natural selection? What did the essay say?
Food resources are rarely shared uniformly in the environment. Most vary seasonally or have a patchy distribution and can become locally depleted.
Discuss similarities and differences how a farmer would use Rhizobium versus Bacillus thuringiensis? Are there any other types of microbes the farmer could use for similar purposes?
In cats, the X-linked allele O converts the black pigment found in the fur into an orange pigment. Heterozygous females are mosaics of orange and black pigmented fur.
Suppose when a virus goes out of lysogeny to finish the lytic pathway, it loops up. DRAW this looping just prior to recombining out of the chromosome.
Describe what kind of changes need to occur in the motor neuron and its target muscle in order for a synapse to form. What kinds of proteins/organelles need to be summoned to the area in each cell?
In plants, the mitochondrial, chloroplasts and nuclear genomes all contain ribosomal RNA genes. Would you expect the ribosomal RNA genes of a plant's mitochondria to be more like those of its chloroplasts
Describe the function of Cdc25 and Wee1 and why deficit of Cdc25 or excess of Wee1 can cause G2 arrest.
Describe the relationship between the amount of O2 consumed and time. Why is it necessary to correct the pea readings with the bead readings?
In cells, an enzyme catalyzes the reaction AB --> A + B. However, it was discovered as an enzyme that carries out the reverse reaction A + B --> AB. Explain this paradox.
The hydrolysis of pyrophosphate to orthophosphate is in driving forward biosynthetic reactions, such as the synthesis of DNA. This hydrolytic reaction is catalyzed in E.
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