Binding of the signaling molecule epinephrine to its receptor results in (4 points) activation of a steroid hormone receptor inside muscle cells lower blood glucose levels inactivation of the enzyme glycogen phosphorylase increased concentrations of cyclic AMP in the cytoplasm Two cells are close to each other during early embryonic development

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Binding of the signaling molecule epinephrine to its receptor results in (4 points)

1. activation of a steroid hormone receptor inside muscle cells
2. lower blood glucose levels
3. inactivation of the enzyme glycogen phosphorylase
4. increased concentrations of cyclic AMP in the cytoplasm

Two cells are close to each other during early embryonic development. However, one of the cells becomes a muscle cell, while the other becomes a liver cell. What is the best explanation of why this occurs? (4 points)

1. They contain different DNA during the initial zygote formation.
2. They receive different chemical signals in gene expression.
3. They receive different electrical signals to activate DNA replication.
4. They translate different genes from the same transcription

Allergic reactions include runny nose and watery eyes. Doctors can prescribe antihistamine drugs that can prevent or decrease the effects of an allergic reaction. Which of the following does not explain how antihistamine drugs change the signal transduction pathway to help prevent or decrease the effects of an allergic reaction? (4 points)

1. Blocking the signal transduction message in producing histamines
2. Preventing the histamines from binding to the appropriate receptor
3. Inhibiting the enzyme that transforms histidine into histamine
4. Reducing the concentration of histamine outside of the target cell