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What do prokaryotic and eukaryotic cells use to turn certain genes on or off?
Prokaryotic cells use regulatory proteins like repressors or activators that bind to the DNA to turn genes on or off. Eukaryotic cells use a combination of transcription factors, chromatin remodeling complexes, and non-coding RNAs to regulate gene expression.
Can your genes turn on and off?
No, an organisms' genes cannot 'turn off' at any point. They are not mechanical in any way.
What causes the lac genes in E. coli to turn off?
A lac repressor turns off the lac genes by binding to the operator.
Can genes turn on and off, and if so, what factors influence this process?
Yes, genes can turn on and off in a process called gene regulation. Factors that influence this process include environmental cues, cellular signals, and regulatory proteins.
Prokaryotic cells or eukaryotic cells come from the cheek?
Cells from the cheek are eukaryotic cells. Eukaryotic cells are characterized by having a nucleus and other membrane-bound organelles, whereas prokaryotic cells lack these features. Cheek cells, like all animal cells, are eukaryotic in nature.
Why was the work of Jacob and monod important to understand gene regulation?
Jacob and Monod's work was important because they proposed the operon model which explains how genes are regulated in prokaryotic cells. They introduced the concept of gene regulation through the control of gene expression, shedding light on how genes are turned on or off in response to specific signals. This foundational research laid the groundwork for understanding how organisms regulate their genes to adapt to changing environments.
How do dna-binding proteins in prokaryotes regulate genes?
Clever mechanisms turn genes off and on so that they only function when there is a need for their services
The test that is used to determine the pattern of genes that are turned on or off in cancer cells is called?
Pedigree
What is the direct result of a normal cells ability to express only certain genes?
Because the genes that are expressed affect every aspect of the cell, from the look and size of the cell to what chemical actions it can carry out, being able to turn some genes off and others on allows the cells to both respond to their environment and, in the case of multicellular organisms, have different types of cells. If the cells in the human body could not regulate their gene expressions then the cells of the liver would be the exact same as the cells of the heart and they would be the same as every other cell. In this situation complex organisms could not exist as we know them.
How can cells have the same DNA?
Although all calls have the DNA only some parts of it are turned on different cells (this is called gene expression). Which genes of the DNA are turned on determine the functions and kinds of cell. Even in the same kinds of cell genes can be differently expessed depending on what the cell needs to do at the time. If you have a drink of alcohol for instance a whole bunch of genes turn on in the liver to detoxify the alcohol. When you have meal hundreds of genes in the stomach, intestine and blood stream kick into action to digest the food and send it away for storage or immediate use. Cells have many things that regulate gene expression some things turn genes off or down others turn them up or on. There are factors turn on whole cascades of genes.
Why do different types of cells arise in your body?
different genes are switched on and off in each type of cell
Do all cells in your body look identical and why?
This is because different genes are switched on or off in different cells. For example, the cells which develop into red blood cells have the gene for making hemoglobin (the red, oxygen-carrying pigment) switched on. Other cells have this gene switched off.
