*Question*
Q: What occurs when the immune system attacks harmless substances that enter the body from the outside? Read this paragraph and choose the correct option from the provided answers: Allergies occur when the immune system attacks harmless substances that enter the body from the outside. Choices: - cell rejection - anomalies - mutation - allergies A:
**Answer**
allergies

*Question*
Q: What is named after the type of enzyme they interact with in the cell? Read this paragraph and choose the correct option from the provided answers: In eukaryotic cells, most of the intracellular proteins that are activated by a ligand binding to a receptor protein are enzymes. Receptor proteins are named after the type of enzyme that they interact with inside the cell. These enzymes include G proteins and protein kinases, likewise there are G-protein-linked receptors and tyrosine kinase receptors. A kinase is a protein involved in phosphorylation. Tyrosine kinase receptors bind many polypeptide growth factors, cytokines, and hormones. Once the ligand is bound, these receptors specifically phosphorylate tyrosine amino acids, activating the signal transduction process inside the cell. Choices: - oxygen proteins - function proteins - nitrogen proteins - receptor proteins A:
**Answer**
receptor proteins

*Question*
Q: When a supercooled liquid boils, the temperature drops as the liquid is converted to what? Read this paragraph and choose the correct option from the provided answers: A superheated liquid exists temporarily as liquid with a temperature above the normal boiling point of the liquid. When a supercooled liquid boils, the temperature drops as the liquid is converted to vapor. Conversely, a supercooled liquid exists temporarily as a liquid with a temperature lower than the normal melting point of the solid. As shown below, when a supercooled liquid crystallizes, the temperature increases as the liquid is converted to a solid. Choices: - carbon - solid - atoms - vapor A:
**Answer**
vapor

*Question*
Q: Most people can survive only a few days without what essential substance? Read this paragraph and choose the correct option from the provided answers: Water is essential to life because biochemical reactions take place in water. Most people can survive only a few days without water. Choices: - air - food - carbon - water A:
**Answer**
water