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A cell was first discovered by Robert hooke by using
cork
.......................... electrons are passed, or transmitted, through a specimen to a fluorescent screen
Transmission electron microscope (TEM )
Which of the following is present in a prokaryotic cell?
mitochondrion
nucleus
Endoplasmic reticulum
cytoplasm
What kind of solution is this ?
Hypertonic
What kind of diffusion by which some sugars can pass through the membrane ?
facilitated diffusion
Osmosis
Simple diffusion
Exocytosis
A key property of the plasma membrane is
semetric permeability
selective permeability
Membrance permeability
homeostasis
............................... are specialized structures that carry out specific cell functions
Cellular structure
Organelles
plasma membrane
Prokaryotic
Which of those are the basic principles of cell theory?
All of the above
Cells are the basic unit of structure of all living organism
Cells arise only from previously existing cells
All living organisms are composed of one or more cells
Which of those sentence is TRUE ?
none of the above
plasma membrane allows all substances to pass through
prokaryotic cells evolved from eukaryotic cells millions of
Phospholipids increase the fluidity of the membrane
If you have a random sample of a plasma membrane, how can you determine if this plasma membrane belongs to an animal or plant cell?
cholesterol
....................... : stick out from the plasma membrane to define the cell’s identity and help cells identify chemical signals
carbohydartes
............................. helps to prevent the fatty-acid tails of the phospholipid bilayer from sticking together
Cholesterol
.......................is the process by which a cell surrounds a substance in the outside environment, enclosing the substance in a portion of the plasma membrane
Endocytosis
.....................................pump uses the energy to transport three sodium ions out of the cell while moving two potassium ions into the cell
Na+/K+ ATPase pump
................................ the regulation of the internal environment of a cell or organism to maintain conditions suitable for life
Homeostasis
......................... Increases in root and stem diameters
Lateral meristem
