At what levels can eukaryotic gene expression be regulated? Which level is the most important for most genes?
What will be an ideal response?
Ans: There are six major control points for the expression of eukaryotic genes: altering the local structure of the DNA, initiating transcription, processing the RNA transcript, transporting mRNA from the nucleus to the cytoplasm, translating the mRNA, and mRNA degradation and turnover. Most control is at the level of initiating transcription.
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Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the metabolic pathway for
arginine production is ornithine ® citrulline ® arginine, you test the ability of the mutant to grow in the presence of just one of these compounds. You find that the mutant can grow in the presence of arginine, but not in the presence of citrulline or ornithine. From this, you can conclude that the product of the mutant gene is most directly involved in the production of ____.
a. arginine from ornithine b. arginine from citrulline c. citrulline from ornithine d. ornithine from arginine e. citrulline from arginine
Four of the five statements below are consistent with
Darwin’s theory of natural selection. Select the exception. a. All populations tend to overproduce. b. Some members are more adapted to the rigors of competition. c. Limited resources put limits on population growth. d. Variation in individuals is not inheritable. e. Traits appear and disappear.
In Drosophila, an individual female fly was observed to be of the XXY chromosome complement (normal autosomal complement) and to have white eyes as contrasted with the normal red eye color of wild type. The female's mother and father had red eyes
The mother, however, was heterozygous for the gene for white eyes. Knowing that white eyes are X-linked and recessive, present an explanation for the genetic and chromosomal constitution of the XXY, white-eyed individual. It is important that you state in which parent and at what stage the chromosomal event occurred that caused the genetic and cytogenetic abnormality.
When sucking liquid into the tip of a micropipette, why do you release the push button slowly?
What would be an ideal response?