Answer: Nerve cells and muscle cells are excitable because their cell membrane can produce electrochemical impulses and conduct them along the membrane.
Explanation:
Expodentially is the correct answer
1 nature of the acid present in the virion.
2 symmetry of the protein shell.
3 presence or absence of a lipid membrane.
4 diamentions of the virion and capsid.
Answer: Alanine and glutamine play special roles in the transport of amino groups from the muscle and from other nonhepatic tissues, respectively, to the liver.
Explanation: