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Many genes in both prokaryotes and eukaryotes contain many sequences that can cause pauses or prematurely terminate transcription. Nevertheless, the genes within a cell normally produces multiple RNAs that may be thousands of nucleotides long without pausing or terminating prematurely. However, when a single round of transcription occurs on such templates in a test tube, RNA synthesis is frequently interrupted by pauses and premature terminations, which reduces the transcriptional rate and frequently shorten the length of the mRNA molecules. Most pauses and terminations occur when RNA polymerase temporarily backtracks for one or two nucleotides along the DNA. Experimental findings have demonstrated that most transcriptional delays and premature terminations disappear if several RNA polymerases are transcribing the DNA simultaneously. Propose an explanation for faster transcription and longer mRNA when the template DNA is being transcribed by multiple RNA polymerases.
In the dihybrid cross shown below, genes A and B are linked with 10map units between them. A is completely dominant to a, and B is completely dominant to b, the phenotypic ratio
Sometimes, we see an ELISA plate in which every well turnsyellow upon the addition of substrate. Can you think of onetype of error that would result in this finding? What do youpredict would happen if the substrate were added in acid solution?
Mrs. Ksanthia is a 56 year old obese woman with Diabetes Mellitus Type 2 "DMT2 or DM2" who is admitted for treatment of an infected, painless, DM related foot ulcer. There is a 20x10 cm area of cellulitis surrounding the ulcer, which has some puru..
A patient with poor renal perfusion is treated with an ACE inhibitor and goes into renal failure. Explain the reason for the renal failure.
Who does not readily enter blood capillary of the villi but must enter the lymphatic capillary of villus instead, amino acid, gluclose, calcium and copper or cholesterol and triglyceride?
Describe the types of cells and their functions, in the vertebrate retina, including how photons affect rhodospin.
If heterozygotes for the beta-thalassemia allele are protected against malaria, what is the selection coefficient s1 aganist homozygotes for the normal allele? Again, what assumption must you make in your calculation?
Which of the following are secondary sex characteristics in females?
Describe why the Q Cycle hypothesis was proposed and what, if any, experimental evidence exists to support such a cycling of hydroquinone.
Identify the components and functions of each primary organ or structure in the urinary system and explain the flow of urine from each of the primary organs and structures.
Which statement does not follow Mendel’slaw of segregation?: *
1-how is predator mobbing an adaptive behavior? find two current peer-reviewed journal articles that support your
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