Ch4 Khan Academy
What type of microscopy tool should the scientists use in order to observe these structures?
Transmission electron microscope
Which of the following is true regarding the cell theory?
Cells are the basic units of life. Cells are the "building blocks" of life, making up all living things. All living organisms are made of one or more cells. Living things can be unicellular (made of one cell) or multicellular (made of more than one cell).
Which of the following choices correctly describes the composition of the cell membrane?
Contains lipids and proteins The plasma membrane is made of lipids that form a phospholipid bilayer. It also contains proteins that help with transport and cellular communication.
Which of the following discoveries was the last to be made?
Each cell must come from a preexisting cell. Scientists knew that cells existed and composed living things, but they were unsure about where cells came from. It wasn't until the 1850s that scientists uncovered that cells cannot arise spontaneously, but they must come from other cells.
What type of microscope would be most effective for studying a living cell?
Light microscope In a light microscope, visible light passes through the specimen and is bent through the lens system, allowing the user to see a magnified image. Light microscopes can often be used on living cells to see them carrying out their normal behaviors.
Which of the following statements correctly identifies the name and function of the cell structure labeled X?
Nucleus - stores genetic material Cell structure X is the nucleus, which is responsible for storing the cell's genetic information.
Which of the following choices describes a function of the plasma membrane?
Separating the interior of the cell and the exterior of the cellControlling the passage of various moleculesReceiving cell signals
Which of the following observations tells her that the organism is eukaryotic?
The organism has a membrane bound nucleus. Eukaryotes have membrane-bound nuclei, while prokaryotes typically have DNA organized into circular "loops" that float freely in the cytoplasm.
Which of the following best describes the newly discovered organism?
The organism is eukaryotic, because it has a nucleus. Only eukaryotes have a nucleus. Since this organism has a nucleus, it must be eukaryotic.
Which of the following best describes the organism seen below?
The organism is prokaryotic, because it does not contain membrane-bound organelles. Only eukaryotes have a nucleus and other membrane organelles such as mitochondria and chloroplasts. This cell does not have any of these organelles
Which scientists played a role in developing the cell theory?
Theodor SchwannRobert RemakRobert HookeMatthias Schleiden
Which of the following features makes Trichodina different from all prokaryotes?
Trichodina has a nucleus. Only eukaryotes have a membrane-bound nucleus, which directs cellular functions and stores genetic information.
List the following microscopic items from smallest (top) to largest (bottom).
Water MoleculeHemoglobinInfluenza VirusSkin CellGrain of Salt
