*Question*
Q: Which type of substance is considered a proton donor in a reaction? Read this paragraph and choose the correct option from the provided answers: The Arrhenius definition of acids and bases is somewhat limited. There are some compounds whose properties suggest that they are either acidic or basic, but which do not qualify according to the Arrhenius definition. An example is ammonia (NH 3 ). Its aqueous solution turns litmus blue, it reacts with acids, and displays all the other properties of a base. However, it does not contain the hydroxide ion. In 1923, a broader definition of acids and bases was independently proposed by Danish chemist Johannes Brnsted (1879-1947) and English chemist Thomas Lowry (1874-1936). A Brnsted-Lowry acid is a molecule or ion that donates a hydrogen ion in a reaction. A Brnsted-Lowry base is a molecule or ion that accepts a hydrogen ion in a reaction. A hydrogen ion is commonly referred to as a proton, and so acids and bases are proton donors and proton acceptors respectively according to the Brnsted-Lowry definition. All substances that are categorized as acids and bases under the Arrhenius definition are also defined as such under the Brnsted-Lowry definition. The new definition, however, includes some substances that are left out according to the Arrhenius definition. Choices: - base - carbon - oxygen - acid A:
**Answer**
acid

*Question*
Q: Where are sensors for thermoregulation concentrated in the brain? Read this paragraph and choose the correct option from the provided answers: Choices: - thyroid - pituitary gland - medulla - the hypothalamus A:
**Answer**
the hypothalamus

*Question*
Q: What part of the brain is largest in intelligent mammals? Read this paragraph and choose the correct option from the provided answers: In intelligent mammals, such as primates, the cerebrum is larger compared to the rest of the brain. A larger cerebrum allows primates to develop higher levels of intelligence. Primates have the ability to learn new behaviors. They also engage in complex social interactions, such as fighting and play. Choices: - thallus - manubrium - cortex - cerebrum A:
**Answer**
cerebrum

*Question*
Q: Which virus causes cold sores? Read this paragraph and choose the correct option from the provided answers: Cold sores are caused by a herpes virus. Choices: - flu virus - microbes virus - stilts virus - herpes virus A:
**Answer**
herpes virus