The expressed gene must be incorporated into the bacterial chromosome, but its promoter region should be replaced with a bacterial promoter.
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What about bacterial chromosome?</h3>
- The term "nucleoid" refers to a bacterial chromosome.
- It has genetic material inside and is a strange shape. It may also be known as a genophore.
- Both transcriptional activators and repressors control gene expression in eukaryotic cells.
- Eukaryotic repressors bind to specific DNA sequences and prevent transcription, just like their prokaryotic counterparts.
- Since transcription and translation are physically distinct processes, eukaryotic gene expression is more complex than prokaryotic gene expression.
- Eukaryotic cells, as opposed to prokaryotic cells, have a wide range of levels at which they can control gene expression.
- While transcription and translation can both happen at the same time in bacteria, in eukaryotes, transcription takes place in the nucleus and translation happens in the cytoplasm.
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Question: It is often desirable to express eukaryotic genes in bacteria, which can make a protein of interest quickly and cheaply. What is TRUE about this kind of genetic transformation?
a. The expressed gene and the genes for all of its regulatory elements must be incorporated into the bacterial chromosome.
b. Only polycistronic genes are capable of being expressed in a bacteria.
c. The expressed gene and the gene for RNA Polymerase II must both be incorporated into the bacterial genome.
d. Only the transcribed region of the gene should be incorporated into the bacterial genome. No promoter is necessary to transcribe a transformed gene.
e. The expressed gene must be incorporated into the bacterial chromosome, but its promoter region should be replaced with a bacterial promoter.
Answer;
-Keratinized stratified squamous epithelium forms the epidermis of the skin.
-In keratinized stratified squamous epithelial tissue, the cells on the apical (outer) surface are dead.
Explanation;
-Stratified squamous epithelium is a type of tissue found covering and lining parts of the body. Stratified squamous epithelium may be keratinized or nonkeratinized. Non-keratinized surfaces must be kept moist by bodily secretions to prevent them from drying out.
-The cells on the surface of stratified squamous keratinized epithelium are very flat. Not only are they flat, but they are no longer alive. They have no nucleus or organelles. They are filled with a protein called keratin, which is what makes our skin waterproof.
The right answer is The cells are damaged.
Take the example of skin cells.
The skin consists of two tissues:
* the outermost, the epidermis, resting on a vascularized connective tissue,
* the dermis.
In the epidermis, which includes several layers of cells, the outer layer is formed of dead cells that are desquamating and are constantly being replaced from proliferating basal cell cells. So, in normal conditions, the epidermis is in constant renewal.
On the other hand, when accidentally, the upper parts of the epidermis are damaged, for example, a slight abrasion or of a burn, the destroyed portion is regenerated (replaced) thanks to an accelerated proliferation of basal epidermal cells .
