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WorksheetsCell Theory and The Cell Membrane
Total questions: 27
Worksheet time: 27mins
Which year marks the first observation of living cells by Anton van Leeuwenhoek?
1665
1675
1838
1859
Which of the following statements is true about organisms according to the cell theory?
All organisms are multicellular.
Some organisms are unicellular.
All organisms are non-cellular.
Some organisms are non-living.
Which of the following is NOT a principle of the cell theory?
Cells contain DNA.
Cells arise from pre-existing cells.
Cells do not use energy.
Cells are the units of structure and function.
What is the primary function of the cell membrane?
To produce energy
To separate the cell's interior from the outside environment
To store genetic information
To synthesize proteins
Some scientists consider viruses to be living. State two reasons why viruses do not conform to the cell theory.
What type of molecules are electrolytes that are transported into the cell?
Proteins
Ions
Lipids
Carbohydrates
Which of the following is a waste product transported out of the cell?
Fructose
Water
Ethanol
Vitamins
Which of the following is a role of the cell membrane?
Controlling the entry and exit of materials
Producing glucose
Replicating DNA
Synthesizing lipids
What is the model called that helps scientists visualize and understand cell membrane structure?
Solid mosaic model
Rigid mosaic model
Fluid mosaic model
Static mosaic model
What does the fluid mosaic model describe?
The structure of the cell wall
The structure of the cell membrane
The structure of the nucleus
The structure of the cytoplasm
What does the term "mosaic" in the fluid mosaic model refer to?
The uniformity of the cell membrane
The color pattern of the cell membrane
The arrangement of many small parts working together
The thickness of the cell membrane
What does the term 'fluid' in the fluid mosaic model refer to?
The ability of lipids and proteins to remain static
The ability of lipids and proteins to continually move
The ability of lipids to dissolve in water
The ability of proteins to form rigid structures
Explain why the current model of our cell membrane structure is called the 'fluid mosaic model'.
Explain why phospholipids tend to form into a bi-lipid layer when they are placed in water.
What is the purpose of a "model" in scientific terms?
To provide an exact replica of a phenomenon.
To represent a scientific phenomenon.
To simplify a phenomenon beyond recognition.
To replace the phenomenon entirely.
(a) : These molecules are constantly (b) in two dimensions, similar to icebergs floating in the ocean. These components are not anchored in place, they are free to move. (c) : An arrangement of (d) , cholesterols, proteins, and other molecules that assembled like a mosaic of tiles. (e) : A representation of a scientific phenomenon.
What characteristic does the head of a phospholipid have?
Hydrophobic
Hydrophilic
Neutral
Amphipathic
In the phospholipid bilayer, which direction do the tails face?
Outward
Inward
Randomly
Parallel to the heads
Which part of the phospholipid faces inward, away from water?
Hydrophilic heads
Polar heads
Hydrophobic tails
Phosphate heads
Describe some examples of how advances in technology have contributed to our current understanding of the cell theory.
What do phospholipids provide for cell membranes?
Energy
Structural organization
Genetic information
Transport mechanisms
What is the primary role of membrane proteins?
Provide energy
Carry out specific functions of membranes
Store genetic information
Form the lipid bilayer
What provides the basic structure of biological membranes?
Carbohydrates
Proteins
Lipid bilayer
Nucleic acids
The (a) , also called the (b) , is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a (c) that is semipermeable. The cell membrane (d) the transport of (e) entering and exiting the cell.
How do plasma membrane proteins help the cell interact with its environment?
By storing energy
By receiving chemical signals from outside the cell
By producing proteins
By dividing the cell
What is one of the functions of membrane proteins?
Energy production
Hormone binding sites
DNA replication
Photosynthesis
