Answer:
IT is to protect the cells from harm like a barrier
Explanation:
The second artery that branches off the aortic arch is the left common carotid artery.
<h3>What is the left common carotid artery?</h3>
The left common carotid artery is a blood vessel that emerges from the aorta in the hearth.
The left common carotid artery is one of the most important branches of the arterial system.
In conclusion, the second artery that branches off the aortic arch is the left common carotid artery.
Learn more about the left common carotid artery here:
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Answer:
The correct answer is B high levels of lactose and high levels of cyclic AMP.
Explanation:
Lac operon contain 3 regulatory genes and 3 structural genes.In presence of lactose the repressor molecule that is encoded by Lac I gene cannot bound to the operator region.
Bacause the lactose interact with the repressor and change its conformation so that it cannot repress the expression of the structural genes of lac operon.
On the other hand cyclic AMP is a positive regulator of lac operon .The interaction of cyclic AMP with the promoter region of lac operon stimulates the binding of RNA polymerase in the promoter region to boost the expression of structural genes of lac operon such as Lac Z,Lac Y and Lac A.
Answer and Explanation:
Dicondylic Skull : It has two occipital condyles, with the help of these two condyles skull is connected by first vertebra of vertebral column
i.e, Atlas, this type of skull is called dicondylic skull.
Monocondylic skull : Only one occipital condyle is present in skull, this type of skull is called monocondyl skull.
Ribs are present in neck and thorax ribs of thoracic region make true sternum