An onion is made-up of layers, which is separated by a thin skin or
membrane. The cells are easily visible under a high power, compound microscope
and the preparation of a thin section is straightforward.<span> </span>
<span>The correct
procedure for preparing a stained wet mount of onion epidermis are as follows.
First, place a piece of thin onion epidermis on a slide. Second, add one drop
of water and put one edge of a coverslip in the water drop, and then slowly
lower the opposite edge to the water. Third, put one drop of stain at one edge
of the coverslip and put a piece of paper towel at the opposite side of the
coverslip. Lastly, allow the towel to absorb some water so that the stain will
move under the coverslip and view it under a microscope. </span>
Hello there! Long time no see old friend. :)
<span>
What are heat resistant zooxanthellae?
What is Coral Bleaching?
</span>
Answer: Coral bleaching is the loss of extracellular Endosymbionts and, Heat Resistant Zooxanthellae causes,Coral Bleaching due to <span>climate changes</span>
<span>The endosymbiotic theory deals with the origins of mitochondria and chloroplasts, two eukaryotic organelles that have bacteria characteristics. Mitochondria and chloroplasts are believed to have developed from symbiotic bacteria, specifically alpha-proteobacteria and cyanobacteria, respectively.</span>
Answer:
Regulatory gene
Explanation:
Transcription is one of the major processes that occurs during gene expression. It is the transfer of the genetic instructions in DNA to mRNA. A strand of mRNA is made using complementary base pairs.
However, there is need for gene expression to be regulated.
Gene regulation refers to the mechanism that acts to induce or repress the expression of a gene. These include structural & chemical changes to the genetic material, binding of proteins to specific DNA elements to regulate transcription. These proteins that influences transcription by binding to specific nucleotide sequences (DNA segments/gene) are referred to as REGULATORY PROTEINS and those involved in regulating transcription of genes are called TRANSCRIPTION FACTORS.
Regulatory proteins controls the rate and manner of gene expression by binding to specific genes, thus, making it easy or hard for RNA polymerase (enzyme that attaches to DNA to synthesize mRNA molecule) to bind to the promoter of that gene.
Transcription factors (regulatory proteins) that promote gene transcription are called ACTIVATORS while those that decrease are called REPRESSORS.
