What is required for formation of the transcription initiation complex in eukaryotes?
A. binding of a transcription factor to the TATA box, followed by recruitment of additional transcription factors and recruitment of RNA polymerase II
B. binding of the sigma subunit to the start site followed by recruitment of RNA polymerase II
C. binding of RNA polymerase II to the TATA box, followed by recruitment of transcription factors
D. binding of the sigma subunit to promoter elements at -35 and -10, followed by recruitment of the core polymerase
E. binding of a transcription factor to the transcription bubble, followed by recruitment of additional transcription factors and recruitment of RNA polymerase III
Answer: A
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The c-Flip protein, a protein involved in mediating the cell-death pathway, comes in two forms: long (c-FLIPL) and short (c-FLIPS). Both forms appear to be involved in controlled apoptosis in normal cells. However, in colon cancer, the expression of c-FLIPL is associated with what notable characteristic?
a. death of cells surrounding the dying cell b. lesion formation and buildup of extracellular waste products c. increased cell growth d. replication of the genetic material without progression through mitosis
The atomic mass determines the type of element
__________________ Indicate whether the statement is true or false.
After eating a large meal of pasta, an individual's blood sugar levels are elevated. In response to this, the pancreas secretes a hormone called insulin, which acts to lower blood sugar levels
Once the blood sugar levels drop to the normal level, the pancreas stops secreting insulin. This is an example of A) a positive feedback loop. B) acid-base imbalance. C) a negative feedback loop. D) reactions between carbon monoxide and acids. E) energy being made into proteins.
Fermentation is evident by what color?
What will be an ideal response?