Life Science
Question: Who created a system for naming and grouping living things?
Question: Who created a system for naming and grouping living things?
Answer: Carl Linnaeus
Explanation: Carl Linnaeus made a system scientists use to name and group living things.
Question: What is displacement, and how is it different from distance?
Question: What is displacement, and how is it different from distance?
Answer: Distance is how far something travels. Displacement is how far it is from where it started, including direction.
Explanation: If you walk in a circle and end where you started, your distance is not zero, but your displacement is zero.
Question: What happens to atoms during a chemical reaction?
Question: What happens to atoms during a chemical reaction?
Answer: Atoms are rearranged to make new substances.
Explanation: Atoms are not made or destroyed in a chemical reaction. They just join in new ways.
Question: What makes something a mineral?
Question: What makes something a mineral?
Answer: A mineral is naturally made, not living, solid, and has a set makeup.
Explanation: Minerals form in nature and have their own crystal pattern and chemical makeup.
Question: What does the Fluid Mosaic Model describe?
Question: What does the Fluid Mosaic Model describe?
Answer: It describes the cell membrane.
Explanation: The cell membrane is made of fats and proteins that can move around.
Question: Name the four main kinds of large molecules in living things.
Question: Name the four main kinds of large molecules in living things.
Answer: Carbohydrates, lipids, proteins, and nucleic acids
Explanation: These molecules help living things live and grow. Carbohydrates give energy. Lipids store energy. Proteins do many jobs in the body. Nucleic acids hold genetic information.
Question: A car speeds up in 5 seconds. What do we call this change in speed?
Question: A car speeds up in 5 seconds. What do we call this change in speed?
Answer: Acceleration
Explanation: Acceleration means a change in speed or direction over time.
Question: Which is more acidic: pH 3 or pH 5?
Question: Which is more acidic: pH 3 or pH 5?
Answer: pH 3
Explanation: Lower numbers on the pH scale mean stronger acids.
Question: On the Mohs hardness scale, which mineral is hardest and which is softest?
Question: On the Mohs hardness scale, which mineral is hardest and which is softest?
Answer: Diamond ranks 10 (hardest); Talc ranks 1 (softest).
Explanation: The Mohs scale goes from 1 to 10. Higher numbers mean harder minerals.
Question: What is the difference between passive transport and active transport?
Question: What is the difference between passive transport and active transport?
Answer: Passive transport does not need energy. Active transport needs energy.
Explanation: Cells use passive transport when materials move easily. They use active transport when they need to move materials with energy.
Question: Animals store energy as _____. Plants store energy as _____.
Question: Animals store energy as _____. Plants store energy as _____.
Answer: Glycogen; starch
Explanation: Animals store extra sugar as glycogen. Plants store extra sugar as starch.
Question: What is the difference between a vector and a scalar? Give examples.
Question: What is the difference between a vector and a scalar? Give examples.
Answer: A vector has size and direction, like velocity. A scalar has size only, like speed or time.
Explanation: Vectors tell how much and which way. Scalars tell only how much.
Question: What is the difference between an ionic bond and a covalent bond? Give one example of each.
Question: What is the difference between an ionic bond and a covalent bond? Give one example of each.
Answer: In an ionic bond, atoms give or take electrons, like in salt. In a covalent bond, atoms share electrons, like in water.
Explanation: Ionic means electrons move from one atom to another. Covalent means atoms share electrons.
Question: What is the difference between cleavage and fracture in minerals?
Question: What is the difference between cleavage and fracture in minerals?
Answer: Cleavage means a mineral breaks in flat, smooth ways. Fracture means it breaks in rough or uneven ways.
Explanation: Some minerals break along smooth lines. Others break unevenly.
Question: What is osmosis? What happens to a cell in a hypertonic solution?
Question: What is osmosis? What happens to a cell in a hypertonic solution?
Answer: Osmosis is the movement of water through a membrane. In a hypertonic solution, water leaves the cell and the cell shrinks.
Explanation: Water moves to the side with more dissolved material. That makes the cell lose water.
Question: What are the four levels of protein structure?
Question: What are the four levels of protein structure?
Answer: The four levels are primary, secondary, tertiary, and quaternary structure.
Explanation: These levels show how a protein is put together and folded into its final shape.
Question: When you throw an object up, what force pulls it back down?
Question: When you throw an object up, what force pulls it back down?
Answer: Gravity
Explanation: Gravity pulls objects toward Earth, so they slow down, stop, and fall back down.
Question: What kind of bond forms when atoms share electrons unevenly?
Question: What kind of bond forms when atoms share electrons unevenly?
Answer: A polar covalent bond
Explanation: In this kind of bond, one atom pulls harder on the shared electrons than the other.
Question: What are the three main types of rocks, and how do they form?
Question: What are the three main types of rocks, and how do they form?
Answer: Igneous rocks form when melted rock cools. Sedimentary rocks form from layers of sediment. Metamorphic rocks form when heat and pressure change rock.
Explanation: Rocks can change from one type to another in the rock cycle.
Question: What are the three main stages of cellular respiration?
Question: What are the three main stages of cellular respiration?
Answer: The three stages are glycolysis, the Krebs cycle, and the electron transport chain.
Explanation: Cellular respiration helps cells get energy from food.
Question: What is displacement, and how is it different from distance?
Question: What is displacement, and how is it different from distance?
Answer: Distance is how far something travels. Displacement is how far it is from where it started, including direction.
Explanation: If you walk in a circle and end where you started, your distance is not zero, but your displacement is zero.
Question: A ball is thrown forward and upward. What two directions does it move?
Question: A ball is thrown forward and upward. What two directions does it move?
Answer: It moves forward and upward.
Explanation: A projectile moves across the ground while gravity pulls it down.
Question: What compound forms when aluminum joins with oxygen?
Question: What compound forms when aluminum joins with oxygen?
Answer: Al₂O₃
Explanation: Ionic compounds must have balanced charges. Aluminum oxide is the balanced formula.
Question: How does cooling speed affect igneous rock texture?
Question: How does cooling speed affect igneous rock texture?
Answer: Slow cooling makes big crystals. Fast cooling makes small crystals or glassy rock.
Explanation: Rocks that cool underground usually have bigger crystals. Rocks that cool near the surface usually have smaller crystals.
Question: How are photosynthesis and cellular respiration connected?
Question: How are photosynthesis and cellular respiration connected?
Answer: Photosynthesis makes food and oxygen. Cellular respiration uses food and oxygen to release energy. The products of one process help the other process happen.
Explanation: Plants make glucose and oxygen. Living things use them to get energy. That is why both processes are important for life.