Cell structure interactive video

Which of the descriptions is he best explanation of a cell membrane?

• A cell membrane is like a plastic bag that holds the cell together.

• A cell membrane has no control over what goes into or out of the cell.

• A cell membrane has layers that allow it to choose what can enter or leave the cell.

• Only animal cells have a cell membrane

How can plants grow to very large sizes without bones to support their body?

• They surround their cells with wood, like an animal cell surrounds itself by minerals.

• They have to have a system of tubes to carry food and water through their bodies.

• Their cell walls are tough enough and strong enough to support their bodies.

• They have chloroplasts that help them to produce enough energy to grow to large sizes.

What is cytoplasm mostly made of?

• Jello

• Water

• Cytogoo

• Sugary syrup

Why is cytoplasm important?

• It supports the organelles inside the cell.

• It makes food for the cell.

• It provides energy for the cell

• It is made of thousands of little tubes that carry materials from one place to another inside the cell.

What special chemical is inside the nucleus and carries all of the instructions for the structure and function of the cell?

• Glucose

• DNA

• Protein

• Lipids

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Why is the mitochondria often called the powerhouse of the cell?

• It provides energy for the rest of the cell.

• It produces sugar, which powers the cell.

• It stores energy until the cell needs it.

• It carries energy from one part of the cell to another.

Ribosomes are tiny little structures inside the cell. There are a lot of ribosomes in the cell. Why does the cell need so many ribosomes?

• They are like little machines that make all of the proteins the cell needs for structure, function and repair.

• They transport sugar and other molecules to the parts of the cell that need supplies.

• They break molecules into smaller pieces to help make structures inside the cell.

• They store water inside the cell to help the cell keep its shape.

Why are proteins so important?

• Different proteins help the cell grow, repair itself or make products the cell needs in order to do its job.

• Proteins are the kind of food that helps us grow big and strong.

• Proteins are not all that important. Sugar is much more important for the function of the cell.

• Proteins contain all of the instructions that the cell needs in order to do its job.

How do proteins and other materials get to the parts of the cell that need them?

• Tiny molecules called "transport fairies" grab materials in the cytoplasm and carry them to cell parts that send out a materials request.

• The molecules swim through the cytoplasm until an organelle grabs them and turns them into something important.

• They are carried through a transportation system called the endoplasmic reticulum.

• The motion of protein and other materials inside a cell is completely random. They only end up where they are needed because cells are so tiny.