Answer the following question given this paragraph: Autism has a wide phenotypic spectrum of disability. Twin studies have been instrumental in demonstrating an environmental component in autism. Q: Twin studies have been instrumental in demonstrating what type of component in autism? Choices: - internal - bacterial - natural - environmental A:
environmental
(Question)
Answer the following question given this paragraph: Van der Waals forces are weak interactions between molecules that involve dipoles. Q: Van der waals forces are weak interactions between molecules that involve what? Choices: - atoms - particles - photons - dipoles A:
(Answer)
dipoles
Ques: Answer the following question given this paragraph: Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the oxygen atoms in the Figure above . Alone, each oxygen atom has six valence electrons. By sharing two pairs of valence electrons, each oxygen atom has a total of eight valence electrons. This fills its outer energy level, giving it the most stable arrangement of electrons. The shared electrons are attracted to both oxygen nuclei, and this force of attraction holds the two atoms together in the oxygen molecule. Q: What do covalent bonds give atoms a more stable arrangement of? Choices: - protons - neutrons - cell walls - electrons A:
Ans: electrons
(Q).
Answer the following question given this paragraph: Ovulation, the release of an egg from the ovary, occurs at about the midpoint of the cycle. This would be around day 14 of a 28 day cycle. The egg is swept into the fallopian tube. If sperm is present, fertilization may occur. As sperm can only survive in the fallopian tube for up to a few days, fertilization can only occur within those few days post-ovulation. Q: Ovulation is the release of an egg from the what? Choices: - fallopian tubes - cervix - vagina - ovary A:
(A).
ovary
Ques:Answer the following question given this paragraph: Tonicity Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three termshypotonic, isotonic, and hypertonicare used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside the cell, and water enters the cell. (In living systems, the point of reference is always the cytoplasm, so the prefix hypo- means that the extracellular fluid has a lower concentration of solutes, or a lower osmolarity, than the cell cytoplasm. ) It also means that the extracellular fluid has a higher concentration of water than does the cell. In this situation, water will follow its concentration gradient and enter the cell. This may cause an animal cell to burst, or lyse. In a hypertonic solution (the prefix hyper- refers to the extracellular fluid having a higher concentration of solutes than the cell's cytoplasm), the fluid contains less water than the cell does, such as seawater. Because the cell has a lower. Q: What describes the amount of solute in a solution? Choices: - viscosity - solubility - frequency - tonicity A:

Ans:tonicity
Answer the following question given this paragraph: Some extrusive igneous rocks cool so rapidly that crystals do not develop at all. These form a glass, such as obsidian. Others, such as pumice, contain holes where gas bubbles were trapped in the lava. The holes make pumice so light that it actually floats in water. The most common extrusive igneous rock is basalt. It is the rock that makes up the ocean floor. Shown below are three types of extrusive igneous rocks ( Figure below ). Q: What helps pumice float in water? Choices: - high density - large mass - gravity - gas bubble holes A:
gas bubble holes