Answer:
The nucleus (On the image, it's the sphere in the middle)
The list of <span>not correctly paired parasympathetic outflow </span><span>would be:
1. nerves coming from the sacral section innervate lungs and heart
</span><span>2. vagus nerve stimulates many glands in the head like lacrimal and salivary glands
</span><span>
Sacral region is located in the tailbone, near the hip. The location itself too far from lungs and heart, which actually nerved by vagus.
</span>Lacrimal and salivary glands are nerved by the submandibular (cranial VII) and glossopharyngeal(cranial IX), not vagus(cranial X)
Answer: A
Explanation:The Trp operon is responsible for synthesis of the amino acid trytophan when it is not available in the cellular environment.
When the tryptophan is plentiful, a repressor protein binds to two molecules of tryptophan.
Thiss repressor-tryptophan complex binds to the trp operator. This binding prevents the binding of RNA polymerase, so the operon is not transcribed, and no new trptophan is produce.
On the other hand, when tryptophan levels are reduced, the inactive repressor will not bind the tryptophan operator so the operon is transcribed.
Regulation of the trp operon is determined by the concentration of tryptophan; when adequate tryptophan is present in the growth medium, there is no need for tryptophan biosynthesis.
Transcription is turned off when a high concentration of tryptophan is present, and is turned on when tryptophan is absent. The regulatory signal is the concentration of tryptophan itself.
Therefore in the absence of tryptophan, the inactive repressor cannot bind trpO, so operon gene transcription occurs.
Answer:
In the analysis, it is necessary to have into account the characteristics of each of these amino acids:
Lysine (Lys) and arginine (Arg) are charged (basic) amino acids. On the other hand, glycine is an amino acid generally found in the surface of proteins. Finally, methionine (Met) is known to have both polar and non-polar properties
.
The codons involved in the formation of these amino acids are:
Methionine: ATG (start codon)
Leucine: CTT; CTC; CTA; CTG
Arginine: CGT; CGC; CGA; CGG
Glycine: GGT; GGC; GGA; GGG
