Cell Theory
What is the difference between a scientific theory and a scientific law?
Law - Tested many times with the same results every time.
Answers may vary
Which is the smallest unit of life in a living organism?
A. cell
B. nucleus
C. organ
D. tissue
A. Cell
Which scientific tool was essential to the development of the cell theory?
A. computer
B. microscope
C. stethoscope
D. telescope
B. microscope
How does the law of conservation of energy apply to the changes in potential and kinetic energy of a pencil as it falls to the floor?
A. Potential energy is converted into kinetic energy.
B. Kinetic energy is converted into potential energy.
C. Kinetic energy is created as potential energy is destroyed.
D. Potential energy is created as potential energy is destroyed.
A. Potential energy is converted into kinetic energy.
A skateboard sits motionless at the top of a ramp. What will happen to the skateboard if a balanced force acts upon it?
A. It will roll forward down the ramp.
B. It will roll backward down the ramp.
C. It will fall off the ramp.
D. It will stay in place.
D. It will stay in place.
Which statement provides a reason why a scientific theory could change?
A. Scientists repeat the experiments associated with the theory.
B. Scientists find new evidence that does not fit the theory.
C. The theory is published in a scientific journal.
D. The theory is over one hundred years old.
B. Scientists find new evidence that does not fit the theory.
Which job is performed by the cell wall of a plant?
A. maintaining shape
B. controlling functions
C. breaking down materials
D. passing on genetic material
A. maintaining shape
What is homeostasis ?
maintaining a stable internal environment to sustain life regardless of external conditions.
A skier uses a pair of poles to push himself down a ski slope. Which of the following correctly states when the skier has the most potential energy?
A. when the skier is at the top of the ski slope
B. when the skier starts to travel down the slope
C. when the skier reaches the bottom of the slope
D. when the skier comes to a complete stop at the bottom of the slope
A. when the skier is at the top of the ski slope
On a cold morning, Jenny waited for the bus. Jenny's hands were cold, so she rubbed them together to warm them. Which force helped Jenny warm her hands?
A. electricity
B. friction
C. gravity
D. tension
B. friction
What type of questions can be answered through a scientific experiment?
A. questions that are testable
B. questions that rely on opinions
C. questions that ask about feelings
D. questions that are based on beliefs
A. questions that are testable
Which example demonstrates that all cells come from pre-existing cells?
A. A caterpillar feeds on the leaves from an oak tree.
B. An oak tree grows from the seed material in an acorn.
C. Moisture drips from underneath an oak tree leaf in the morning.
D. Sediment from an area where oak trees were cut down builds up alongside a stream.
B. An oak tree grows from the seed material in an acorn.
Which of the following is something that all living organisms have in common?
A. They all contain at least one cell.
Brian rides his bike down a hill without needing to use the pedals. Which sentence best describes the change in energy that is occurring?
A. Kinetic energy is created from potential energy.
B. Kinetic energy is being stored as potential energy.
C. Potential energy is transformed into kinetic energy.
D. Potential energy is being destroyed by kinetic energy.
C. Potential energy is transformed into kinetic energy.
Which type of force could be used to pull up on a metal paper clip without touching it?
A. force of friction
B. force of gravity
C. magnetic force
D. elastic force
C. magnetic force
Which of the following statements is a component of basic cell theory?
A. All cells are able to produce their own food.
B. All living cells came from other pre-existing cells.
C. All organisms are made up of two or more cells.
D. All cells gain energy from eating other cells.
B. All living cells came from other pre-existing cells.
Which organelle is found in plant cells but not in animal cells?
A. vacuole
B. chloroplast
C. cell membrane
D. nucleus
B. chloroplast
What part of the cell stores water?
A. vacuole
B. nucleus
C. cell wall
D. chloroplast
A. vacuole
What is kinetic energy?
What is potential energy?
Kinetic Energy - Energy an object has based on its motion, depends on speed and mass
Potential Energy - Energy that results from the position or shape of an object, has the potential to create change or cause motion
Sarah has a 3-kilogram block and a 5-kilogram block. When would a block's gravitational force on Sarah be strongest?
A. when she stands one meter away from the 3-kilogram block
B. when she stands one meter away from the 5-kilogram block
C. when she stands five meters away from the 3-kilogram block
D. when she stands five meters away from the 5-kilogram block
B. when she stands one meter away from the 5-kilogram block
What are the three components of the cell theory?
1.) All organisms are composed of cells
2.) All cells come from pre-existing cells
3.) Cells are the basic unit of life
Living organisms grow bigger, repair damage to themselves, and reproduce. In what way are all these processes similar?
A. New cells are made in all of them.
Cells are able to maintain homeostasis by keeping the perfect balance of water and nutrients inside of them.
Which cell part regulates the materials that leave or enter the cell to maintain this balance?
A. the nucleus
B. the chloroplast
C. the cell membrane
D. the endoplasmic reticulum
C. the cell membrane
What does potential energy depend on?
What does kinetic energy depend on?
Potential Energy - Mass and height
Kinetic Energy - Mass and speed
A ball sits on top of a hill. The wind blows and the ball begins rolling down the hill. What caused the ball to start moving?
A. The wind created an unbalanced force on the ball.
B. The wind stopped all other forces acting on the ball.
C. All forces acting on the ball became equal and balanced.
D. All forces acting on the ball moved in the same direction.
A. The wind created an unbalanced force on the ball.