7. Are all prokaryotic genes expressed all of the time? Why or why not? How does the cell know which genes to express and when?
7. Are all prokaryotic genes expressed all of the time? Why or why not? How does...
How could an investigator identify which genes are being expressed in a cell or population of cells at a specific time or under a specific condition? Use microarray analysis Use RNA-Seq O Query the metatranscriptome Through proteomic analysis All of the above
in prokaryotic genes, why would it be advantageous for an entire operon to be included in a pathogenicity island? what would be its disadvantages?
9. EVOLUTION CONNECTION A typical prokaryotic cell has about 3,000 genes in its DNA, while a human cell has almost 21,000 genes. About 1,000 of these genes are present in both types of cells. Based on your understanding of evolution, explain how such different organisms could have this same subset of 1,000 genes. What sorts of functions might these shared genes have?
Describe DNA microarray analysis to identify which genes are expressed at a particular developmental stage and in a particular cell type. What type of molecules should be attached to the microarray? What should be fluorescently labeled and be part of the hybridization solution? How can one determine when analyzing the results of such an experiment?
Help please 7. How does the formation of a ring species lead to speciation in the absence of allopatry? 2. Why do we see that each cell is only expressing a small fraction of the genes in it's genome at any given time?
Regulation of Gene Expression in Eukaryotes In all organisms, certain genes are expressed at any given time while other genes are not. Both prokaryotes and eukaryotes regulate gene expression at the transcription stage. However the greater complexity of eukaryotic cells makes it possible for gene expression to be regulated at many other stages as well. The diagram below shows different stages at which gene expression may be regulated in eukaryotes. nucleus chro modifica anscription RNA processing cytoplasm degradation protein processing...
Operons are unique to prokaryotic organisms; the genomes of eukaryotic cells do not contain operons. Which of these explains why operons are useful to prokaryotes? Genes encoded by operons are more accessible to RNA polymerase than other genes. RNA polymerase can transcribe more quickly when genes are located within operons. Encoding genes in operons allows the synchronous transcription of genes with related functions. Operons are not highly regulated and this simplicity is an advantage for prokaryotic organisms.
1) Why do genes on the same chromosome not segregate with “Mendelian Genetics”? Why/How do the frequencies of their co-segregation vary depending on their exact location? 2) Why does separating the left/right halves versus the dorsal/ventral halves of a two-cell stage amphibian embryo yield different results? 3) Why does the transplantation of an early blastopore lip induce head formation, while a late blastopore lip induces a tail?
Eukaryote gene regulation question... about the yeast... please help me... 3. (7 points total) You are studying a set of genes in yeast (a eukaryote) that are required for the utilization of mannose. Mannose is a sugar that can be used by yeast cells but they will preferentially use glucose if it is available; this is similar to how the galactose genes work. Since you are a geneticist you study the genes by mutating them so they won't work and...
Yet, all the cells in your body contain the same genes (and same alleles). The difference across cell types is that genes get selectively expressed (turned on or off) based on the proteins needed for cellular function given their environment. Select which statement explains the reason why hair does not normally grow on your muscle cells. a. Muscle cells have the gene for keratin, but do not express it b. Muscle cells do not have the gene for keratin and...