*Question*
Q: Each endocrine hormone affects only certain "target" cells, which have molecules of what on the surface that enable binding of a given hormone? Read this paragraph and choose the correct option from the provided answers: Each endocrine hormone affects only certain cells, called target cells. A target cell has proteins on its surface to which a given hormone can bind. Most endocrine hormones are controlled by negative feedback loops. Negative feedback occurs when low levels of a hormone feed back to increase its secretionand vice versa. Choices: - lipids - rna - gas - protein A:
**Answer**
protein

*Question*
Q: What is another name for mother of pearl? Read this paragraph and choose the correct option from the provided answers: Mother of pearl is also known as nacre. Nacre is the iridescent inner shell layer. It can be found in buttons, watch faces, knives, guns, and jewelry. It is also used to decorate various musical instruments. Choices: - pigment - enamel - calcium - nacre A:
**Answer**
nacre

*Question*
Q: What are used to balance chemical equations? Read this paragraph and choose the correct option from the provided answers: Coefficients are used to balance chemical equations. A coefficient is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. Choices: - isotopes - densities - outputs - coefficients A:
**Answer**
coefficients

*Question*
Q: What does a healthy immune system fight off? Read this paragraph and choose the correct option from the provided answers: Eat well, get enough sleep, and be active every day. These healthy lifestyle choices will help keep your immune system healthy so it can fight off respiratory infections and other diseases. Choices: - microorganisms and other dieases - respiratory and other dieases - bacteria and viruses - infections and other dieases A:
**Answer**
infections and other dieases