Grade 8 Cells

Which organelle controls the activities of the cell and contains DNA?

Nucleus

What is the function of the cell membrane?

Controls what enters and leaves the cell.

In plant cells, which organelle provides structure and support that animal cells lack?

Cell wall.

Which organelle is responsible for converting food energy into usable energy (ATP?

Mitochondria.

What is the role of the Cytoplasm?

To hold organelles in place and allow materials to move.

Which organelle is found in plant cells but not in animals cells?

Chloroplast

Ribosomes are responsible for producing:

Proteins

Which organelle packages and ships proteins around the cell or out of the cell?

Golgi Body

What is the main function of lysosomes?

Break down waste and old cell parts.

In plant cells, the large central vacuole mainly:

Stores water and helps maintain shape.

The Endoplasmic Reticulum (ER) helps with:

Making proteins and other materials.

Which statement about mitochondria is true?

The release energy from food.

Which two organelles work together to make proteins?

Ribosomes and ER

Chloroplasts are important because they:

Make food using sunlight.

Which organelle is described as the “control center” of the cell?

Nucleus

What does it mean when the cell membrane is described as selectively permeable?

Some substances can pass through, while others cannot.

Which of the following can pass through the cell membrane?

Small molecules

What is the one difference between the rough ER and the smooth ER?

Rough ER has ribosomes, while some ER does not.

What is the main job of the smooth ER?

Producing non-proteins needle by the cell.

Where can ribosomes be found in a cell?

Floating in the cytoplasm and attached to the rough ER.

What is the name of the process carried out by mitochondria that produces energy for the cell?

Cellular respiration

How many layers of membrane surround a mitochondria?

Two.

What is the name of the process that takes place in chloroplasts and provides food for plant cells using sunlight?

Photo synthesis

What are the pancake-like stacks found inside chloroplasts called?

Granum

Where does photosynthesis actually take place in a chloroplast?

In the grandma.

The Golgi apparatus is compared to an Amazon warehouse because it:

Packages proteins and moves them around the cell.

Which statement about vacuoles is correct?

Animal cells tend to have smaller vacuoles than plant cells.

What do lysosomes contain that allows them to break down bio molecules?

Ensymes.

Which statement correctly describes the cell wall?

It is a supportive layer outside the cell membranes.

Which of the following is NOT one of the major organelles?

Centrioles

How many characteristics must an organism display to be considered a living thing?

8

Which of the following is NOT one of the eight characteristics of living things?

Have multiple cells.

What is a unicellular organism?

An organism made of one cell.

Which of the following is an example of a unicellular organism?

Bacteria.

What is the main difference between sexual and asexual reproduction?

Sexual reproduction requires two cells, while asexual reproduction requires one parent cell.

According to the presentation, living things grow primarily by:

Increasing the number of cells they have.

An organism that gets energy from the sun through photosynthesis is called a:

Autotroph

An organism that gets energy by consuming nutrients from its environment is called a:

Heterotroph.

Why do living things need to repair themselves?

To replace lost or damaged tissue.

Which of the following is an example of a stimulus that living things can respond to?

Light.

Which of the following is a waste product produced by living things?

Carbon dioxide.

What does it mean to say that an organism has a lifespan?

It has a specific life cycle.

Which statement is part of modern Cell Therepy?

All cells come from pre-existing cells.

Which scientist is credited with proposing that animals were entirely made of cells?

Theodore Schwann.

Why were microscopes important to the development of our understanding of cells?

They allowed scientists to see cells for the first time.

What is diffusion?

The movement of matter from high concentration to low concentration.

Diffusion occurs:

Automatically when a substance is placed in a solution.

Which of the following is an example of diffusion?

Steeping tea in water.

Why does the smell of perfume eventually spread throughout a room?

The perfume molecules diffuse from an area of high concentration to an area of low concentration.

What is osmosis?

The diffusion of water through a selectively permeable membrane.

During osmosis, water moves from an area of:

High water potential to low water potential.

What does water potential describe?

The concentration of water in a solution.

Which solution has high water potential?

A solution with lots of water compared to solid materials.

Which solution has low water potential?

A solution with very little water compared to solid material.

Why is the cell membrane important during diffusion and osmosis?

It is selectively permeable.

According to the presentation, oxygen enters our cells from our blood by:

Diffusion.

According to the presentation, carbon dioxide moves:

From our cells into our blood by diffusion.

Why can your fingers become pruned after being in water for a long time?

Your skin absorbs water and expands.

How does water move into and out of cells?

Through osmosis.

Which statement correctly compares diffusion and osmosis?

Diffusion is the movement of matter from high to low concentration, while osmosis is the diffusion of water through a selectively permeable membrane.