Researchers concluded that hpca deficiency might inhibit vgccs. evidence in the passage also supports what alternative hypothesis concerning hcpa deficiency? a. it prevents membrane depolarization in response to kcl. b. it is caused by more than one type of hpca mutation. c. it inhibits neuronal membrane voltage-gated sodium channels. d. it increases neuronal membrane calcium conductance.

I think the correct answer would be the first option. The compound CH3NH2 would be classified an amine. Amines are a group of organic compunds that has a nitrogen atom with a lone pair of electrons. Compunds that are classified into this group are usually derivatives of NH3 or ammonia where one of the hydrogen atoms are replaced by an organic chain such as an alkyl or aryl groups.  It cannot be a carboxylic acid since it does not have -COOH group. It cannot be an amino acid and a protein since it does not have the general structure of these classifications. It cannot be an alcohol since it does not have an -OH group.