Name ______Per ______
Bill Nye – Cells
1- There are about ______trillion cells in the human body.
2- If more new cells are formed than old cells that die, your body will ______.
3- The word membrane means ______. Therefore, a cell membrane is a ______that covers the cell.
4- Humans have ______pairs of chromosomes. These chromosomes determine what we will look like, how tall we will be, and how many fingers we will have.
5- Seeds don’t look alive, because they are ______. When water is added, however, the seed cells begin to grow and divide and a new plant sprouts.
6- Hemoglobin is a molecule found in red blood cells that turns ______when the cell is carrying oxygen.
7- ______cells are the only type of cells that can’t be replaced. They don’t grow back when they are injured. That is why spinal cord injuries usually cause permanent paralysis.
8- True or False Muscle cells and skin cells have different jobs, so they look different and have different shapes, but they
are both considered cells.
9- True or False Organisms could never be made of just one cell because asingle cell could never move, grow,
respond, reproduce, and metabolize all by itself.
10- The process where water molecules move across a membrane from high concentration to low concentration is called ______. (Hint: think of the balloon with the vanilla inside.)
Name ______Per ______
Bill Nye – Cells
1- There are about ______trillion cells in the human body.
2- If more new cells are formed than old cells that die, your body will ______.
3- The word membrane means ______. Therefore, a cell membrane is a ______that covers the cell.
4- Humans have ______pairs of chromosomes. These chromosomes determine what we will look like, how tall we will be, and how many fingers we will have.
5- Seeds don’t look alive, because they are ______. When water is added, however, the seed cells begin to grow and divide and a new plant sprouts.
6- Hemoglobin is a molecule found in red blood cells that turns ______when the cell is carrying oxygen.
7- ______cells are the only type of cells that can’t be replaced. They don’t grow back when they are injured. That is why spinal cord injuries usually cause permanent paralysis.
8- True or False Muscle cells and skin cells have different jobs, so they look different and have different shapes, but they
are both considered cells.
9- True or False Organisms could never be made of just one cell because a single cell could never move, grow,
respond, reproduce, and metabolize all by itself.
10- The process where water molecules move across a membrane from high concentration to low concentration is called ______. (Hint: think of the balloon with the vanilla inside.)