YV4-cells-active transport

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

A researcher wants to film the movement of chromosomes during cell division. Which type of microscope should he choose and why is it the best choice?

1. light microscope, because of its high resolving power
2. transmission electron microscope, because of its high magnifying power
3. transmission electron microscope, because of its high resolving power
4. light microscope, because the specimen is alive

Which of the following structures is found in eukaryotic but not prokaryotic cells?

1. cell membrane
2. mitochondria
3. ribosomes
4. DNA

Bacterial cells are prokaryotic; unlike a typical eukaryotic cell they _____.

1. have a smaller nucleus
2. lack chromosomes
3. have no membrane-bounded organelles in their cytoplasm
4. have no ribosomes

Which of the following features do prokaryotes and eukaryotes have in common?

1. mitochondria, cytoplasm, cell membrane
2. ribosomes, cell membrane, cytoplasm
3. nucleus, cell membrane, ribosomes
4. mitochondria, ribosomes, cytoplasm

Which type of cell is most likely to have the most mitochondria?

1. muscle cells in the legs of a marathon runner
2. photosynthetic cells in the leaves of a tree
3. bacterial cells that are growing on sugars
4. non-dividing cells in the skin on your finger

Which of the following processes includes all others?

1. osmosis
2. diffusion of a solute across a membrane
3. facilitated diffusion
4. passive transport

Which one of the following molecules is most likely to diffuse freely across the lipid bilayer of the plasma membrane without the involvement of a transport protein?

1. carbon dioxide
2. glucose
3. sodium ion
4. DNA

A single plant cell is placed in an isotonic solution. Salt is then added to the solution. Which of the following would occur as a result of the salt addition?

1. The added salt would enter the cell, causing the cell to take up water and swell.
2. Water would enter the cell by osmosis, and the cell would swell.
3. Water would leave the cell by osmosis, causing the volume of the cytoplasm to decrease.
4. There would be no osmotic movement of water in response to the added salt.

If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?

1. The red blood cell would burst, and the plant cell would shrink.
2. Both cells would lose water; the red blood cell would shrivel, and the plant plasma membrane would pull away from the cell wall.
3. Both cells would gain water by osmosis; the red blood cell would burst, and the plant cell would increase in turgor pressure.
4. The red blood cell would shrink, and the plant cell would gain water.

Active transport

• The cell invests energy 
• Often against the concentration gradient 
• For example:

       -Pumps in the membrane
       -Endocytosis