Q: What kind of reaction is needed to prepare amides? Choices: - amino acid reaction - oxidize acid reaction - lipophilic acid reaction - carboxylic acid reaction A:
carboxylic acid reaction

Q: What is produced by leydig cells in the embryonic testis and stimulates the development of male sexual organs? Choices: - androgen - insulin - estrogen - testosterone A:
testosterone

Q: The trochophre, a unique larval form, is found in the life cycle of which animal classification. Choices: - eels - coral - sharks - mollusks A:
mollusks