Which of the following are endogenous ligands of receptors（）
A. Neurotransmitter
B. hormone
C. Autoactive substance
D. Mycoplasma
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What are the main problems of CADD at present（）
Authenticity and usability of three-dimensional protein structure
B. The way of receptor ligand interaction
C. Whether the designed molecule can be chemically synthesized
Drug transport, metabolism and side effects in vivo
The minimum wage（）
A. is usually about 75 percent of the average wage earned in manufacturing
B. raises the wages of highly skilled workers
C. encourages master workers to take on apprentices
D. has its greatest impact on teenage unemployment
What are the characteristics of receptors（）
A. Specificity
B. High affinity
C. Saturability
D. Reversibility
Transfer function is suitable for（）system
A. Linear time-invariant system with single input and single output
B. Linear time-varying system with single input and single output
C. multiple input and multiple output
D. nonlinear system
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