Q: What according to scientists is the major cause of depression? Read this paragraph and choose the correct option from the provided answers: Some people have low levels of the neurotransmitter called serotonin in their brain. Scientists think that this is one cause of depression. Medications called antidepressants help bring serotonin levels back to normal. For many people with depression, antidepressants control the symptoms of their depression and help them lead happy, productive lives. Choices: - low thyroid levels - high fat diets - high serotonin levels - low serotonin levels A:
low serotonin levels

Q: Enzymes are a type of what, and as such, they are not reactants in the reactions they control? Read this paragraph and choose the correct option from the provided answers: Like other catalysts, enzymes are not reactants in the reactions they control. They help the reactants interact but are not used up in the reactions. Instead, they may be used over and over again. Unlike other catalysts, enzymes are usually highly specific for particular chemical reactions. They generally catalyze only one or a few types of reactions. Choices: - hormone - metabolite - neurotransmitter - catalyst A:
catalyst

Q: Q: What element is typically used to shield things from gamma rays? Read this paragraph and choose the correct option from the provided answers: High-density materials are much more effective protection against gamma emissions than low-density ones. Gamma rays are usually blocked effectively by lead shielding. The thickness of the shielding will determine the effectiveness of the protection offered by the lead. Choices: - gold - silver - aluminum - lead A:
A: lead

Question: Q: What happens to the reaction rate over the course of a reaction? Read this paragraph and choose the correct option from the provided answers: At the beginning of the reaction, only the reactants A and B are present. Recall that over the course of a reaction, the reaction rate slows down. This is because the rate depends on the concentrations of one or more reactants. As the reactants are used up, their concentrations drop, thus decreasing the reaction rate. Choices: - reverses - stays the same - speeds up - slows down A:
Answer: slows down

*Question*
Q: What is the most common type of organic compound? Read this paragraph and choose the correct option from the provided answers: Carbohydrates are the most common type of organic compound. A carbohydrate is an organic compound such as sugar or starch, and is used to store energy. Like most organic compounds, carbohydrates are built of small, repeating units that form bonds with each other to make a larger molecule. In the case of carbohydrates, the small repeating units are called monosaccharides. Choices: - lipids - hydrocarbons - proteins - carbohydrates A:
**Answer**
carbohydrates

(Question)
Q: What are the effects of light on plant morphology called? Read this paragraph and choose the correct option from the provided answers: Choices: - electrogenesis - Megasporogenesis - Microsporogenesis - photomorphogenesis A:
(Answer)
photomorphogenesis