Answer the following question given this paragraph: Density is mass per unit volume. Density is a measure of how closely molecules are packed together. The closer together they are, the greater the density. Since air is a gas, the molecules can pack tightly or spread out. Q: What is the measure of how closely molecules are packed together? A:
OPTIONS:
- length
- volume
- frequency
- density

Answer: density

Question: Answer the following question given this paragraph: 3.4 | The Cell Membrane By the end of this section, you will be able to: Understand the fluid mosaic model of membranes Describe the functions of phospholipids, proteins, and carbohydrates in membranes A cell's plasma membrane defines the boundary of the cell and determines the nature of its contact with the environment. Cells exclude some substances, take in others, and excrete still others, all in controlled quantities. Plasma membranes enclose the borders of cells, but rather than being a static bag, they are dynamic and constantly in flux. The plasma membrane must be sufficiently flexible to allow certain cells, such as red blood cells and white blood cells, to change shape as they pass through narrow capillaries. These are the more obvious functions of a plasma membrane. In addition, the surface of the plasma membrane carries markers that allow cells to recognize one another, which is vital as tissues and organs form during early development, and which later plays a role in the "self" versus "non-self" distinction of the immune response. The plasma membrane also carries receptors, which are attachment sites for specific substances that interact with the cell. Each receptor is structured to bind with a specific substance. For example, surface receptors of the membrane create changes in the interior, such as changes in enzymes of metabolic pathways. These metabolic pathways might be vital for providing the cell with energy, making specific substances for the cell, or breaking down cellular waste or toxins for disposal. Receptors on the plasma membrane's exterior surface interact with hormones or neurotransmitters, and allow their messages to be transmitted into the cell. Some recognition sites are used by viruses as attachment points. Although they are highly specific, pathogens like viruses may evolve to exploit receptors to gain entry to a cell by mimicking the specific substance that the receptor is meant to bind. This specificity helps to explain why human immunodeficiency virus (HIV) or any of the... Q: What encloses the border of animal cells? A:
OPTIONS:
- Jacket membrane
- dust membrane
- cells membrane
- plasma membrane
Answer: plasma membrane

input with options: Answer the following question given this paragraph: Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals. Q: Intrusive igneous rocks cool from magma slowly in the crust and have large what? A:
OPTIONS:
- pores
- atoms
- coal deposits
- crystals
output: crystals

Q: Answer the following question given this paragraph: Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements. The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive. Because alkali metals are so reactive, they are found in nature only in combination with other elements. They often combine with group 17 elements, which are very "eager" to gain an electron. At the URL below, you can watch a video that shows just how reactive the alkali metals are. Q: Because alkali metals are so reactive, they are found in nature only in ________ with other elements? A:

OPTIONS:
- isolation
- cooperation
- competition
- combination

A: combination

input: OPTIONS:
- a molecule
- a nucleus
- an isotope
- an atom Now, answer this question: Answer the following question given this paragraph: Inside of elements, you will find identical atoms. An atom is the simplest and smallest particle of matter that still has chemical properties of the element. Atoms are the building block of all of the elements that make up the matter in your body or any other living or non-living thing. Atoms are so small that only the most powerful microscopes can see them. Q: The simplest and smallest particle of matter that still has chemical properties of the element is called? A:
A:
output: an atom

Question: Answer the following question given this paragraph: Many of the higher neurological functions, such as memory, emotion, and consciousness, are the result of cerebral function. The complexity of the cerebrum is different across vertebrate species. The cerebrum of the most primitive vertebrates is not much more than the connection for the sense of smell. In mammals, the cerebrum comprises the outer gray matter that is the cortex (from the Latin word meaning "bark of a tree") and several deep nuclei that belong to three important functional groups. The basal nuclei are responsible for cognitive processing, the most important function being that associated with planning movements. The basal forebrain contains nuclei that are important in learning and memory. The limbic cortex is the region of the cerebral cortex that is part of the limbic system, a collection of structures involved in emotion, memory, and behavior. Q: The basal forebrain contains what that are important in learning and memory? A:
OPTIONS:
- oxygen
- ribosomes
- atoms
- nuclei
Answer:
nuclei