How does transcription factor D establish the top of the top-bottom axis of developing flies if it is present in similar numbers in all cells? O Ca++ moves from bottom to top in flies O Another signal causes it to move into the nucleus only in top-defining cells O Its target genes are only in cells that establish the top of the fly Promoters of transcription factor Dare unique to cells that establish the top O ATP is only available in cells that establish the top of the fly

Q: List one example of AMPLIFICATION OF SIGNAL during the cell’s response to Hedgehog

A: * Hedgehog signalling pathway is important during embryogenesis to  controll proliferation of tissue…

Q: Which of the following is not an example of translational control of MRNA? Localization bicoid mRNA…

A: Translation is the process of synthesis of protein. The ribosomes, tRNA, rRNA are involved in the…

Q: Ascll is an activating transcription factor containing a DNA binding domain and an activation…

A: Some transcription factors bind to a DNA promoter sequence near the transcription start site and…

Q: Name the lambda promoters whose expression is regulated by the cro protein. For each promoter you…

A: CI represses cro and Cro represses cI. This is referred to as the double-negative feedback loop and…

Q: You study the expression of the hexose kinase gene and capture the following electron micrograph of…

A: Translation is the process of formation of a sequence of amino acids using messenger RNA as a…

Q: How does finP inhibit TraJ from activating expression of the tra genes? O It basepairs with the traJ…

A: Here both FinO and FinP play important role  TraJ, is controlled by the action of the antisense RNA,…

Q: How does the GA(T>C)A mutation in the Duffy promoter impact Duffy transcription? GACA enhancer does…

A: Duffy is a gene which expresses a protein called duffy protein. This protein act as membrane bound…

Q: You study the expression of the hexose kinase gene and capture the following electron micrograph of…

A: A mutation is a change in the sequence of the DNA that may affect the codons of the DNA or mRNA.…

Q: Enhancers in eukaryotic genomes such as glucocorticoid response elements can upregulate multiple…

A: An Enhancer in Eukaryotic genomes is defined as the DNA sequence which promotes the transcription.…

Q: The following are examples of how eukaryotic cells may control gene expression small RNA molecules O…

A: The eukaryotic genome is huge and consists of millions of base pairs. It is highly packed in…

Q: tatement about the HATS is FALSE? do not interact with non-pioneer regulatory transcription facto…

A: HATs : Histone acetyl transferases. These are the enzymes that acetylate conserved lysine residuals…

Q: The early Drosophila embryo is a syncytium. Why is this significant? O a. it allows the segment…

A: The early Drosophila embryo is indeed a syncytium, which means it is a single cell with multiple…

Q: How can an enhancer that regulates expression of a given gene be active in one tissue but inactive…

A: Enhancers, also known as transcription factors, are DNA regulatory elements that can be bound by…

Q: Propose a model that outlines, step-by-step, events that could reasonably generate the expression of…

A: The "Eve stripe protein" refers to a specific protein called "Even-skipped" (Eve) that is involved…

Q: JCVere ueveloph developmental

A: A cell to cell interaction is the direct communication of the surfaces of the cell which is…

Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.