Ques:Answer the following question given this paragraph: The Sun makes up almost all of the mass of the solar system. Q: What celestial body in the solar system makes up most of its total mass? Choices: - Jupiter - earth - Andromeda - sun A:

Ans:sun
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Ques:Answer the following question given this paragraph: Vacuoles are membrane-bound organelles that can have secretory, excretory, and storage functions. Vacuoles are usually much larger than vesicles. Many organisms will use vacuoles as storage areas and some plant cells have very large vacuoles. The large central vacuole of the plant cell is used for osmotic control (storage of water) and nutrient storage. Contractile vacuoles are found in certain protists. These vacuoles take water from the cytoplasm and excrete it from the cell to avoid bursting due to osmotic pressure. Q: These vacuoles take water from the cytoplasm and excrete it from the cell to avoid bursting due to what? Choices: - apoptotic pressure - static pressure - impervious pressure - osmotic pressure A:

Ans:osmotic pressure
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Ques:Answer the following question given this paragraph: A cell that does not have a rigid cell wall, such as a red blood cell, will swell and lyse (burst) when placed in a hypotonic solution. Cells with a cell wall will swell when placed in a hypotonic solution, but once the cell is turgid (firm), the tough cell wall prevents any more water from entering the cell. When placed in a hypertonic solution, a cell without a cell wall will lose water to the environment, shrivel, and probably die. In a hypertonic solution, a cell with a cell wall will lose water too. The plasma membrane pulls away from the cell wall as it shrivels, a process called plasmolysis . Animal cells tend to do best in an isotonic environment, plant cells tend to do best in a hypotonic environment. This is demonstrated in Figure below . Q: A red blood cell will swell and burst when placed in a? Choices: - acidic solution - exothermic solution - dissolved solution - hypotonic solution A:

Ans:hypotonic solution
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Ques:Answer the following question given this paragraph: The most important way to keep your skin healthy is to protect it from ultraviolet light. Over-exposure to ultraviolet light can cause skin cancer. Keeping the skin clean can help prevent acne. Q: What is one major cause of skin cancer? Choices: - visible light - sunscreen - infrared light - ultraviolet light A:

Ans:
ultraviolet light
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