Answer:
C) ACh binds to receptors in the junctional folds.
Explanation:
The answer
is arthropods have had more time to co-evolve with land plants than have
vertebrates. Analysis of genes shows that their sequences are quite similar,
and these sequences differ from those of the lophotrochozoans and
deuterostomes. Between the annelids and
arthropods will probably be viewed, in retrospect, as an instance of an
evolutionary relationship that modern scientists had ʺset in stone, ʺ now
having crumbled.
The negative feedback principle in human physiology is involved in this case. The inciting factor here is the increase in blood glucose that will be recognized by the pancreatic islet cells (the endocrine part of the pancreas) and will signal insulin release. Insulin upregulates glucose transporter proteins in cells, especially muscle cells, which will then stimulate glucose uptake from blood. Insulin also stimulates glycogen formation in the liver. These events will subsequently lower blood glucose and low blood glucose will now inhibit the insulin secretion by the pancreas. In the event of hypoglycemia or dangerously low blood glucose, the first adaptive mechanism of the body is to produce glucagon from the pancreatic islet cells. Glucagon will stimulate glycogen breakdown in the liver and therefore raise blood glucose levels to normal.<span> </span>
The sugar and phosphate bond is placed outward of the DNA towards the solvent and the base of nitrogen is inside the helix.
Explanation:
The edges that are outward to the double helix formation of DNA are composed by sugar and phosphate molecules and make the backbone.
These two strands of DNA is placed in the opposite direction from the helix. But the nitrogen base is there inside the helix. It shapes like a ladder rung because of the hydrogen bond. This bond keeps the backbone held together.