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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?
nucleus
Endoplasmic reticulum
mitochondrion
cytoplasm
What kind of solution is this ?
Hypertonic
What kind of diffusion by which some sugars can pass through the membrane ?
Exocytosis
Simple diffusion
Osmosis
facilitated diffusion
A key property of the plasma membrane is
Membrance permeability
selective permeability
homeostasis
semetric permeability
............................... are specialized structures that carry out specific cell functions
Cellular structure
Prokaryotic
plasma membrane
Organelles
Which of those are the basic principles of cell theory?
Cells are the basic unit of structure of all living organism
Cells arise only from previously existing cells
All of the above
All living organisms are composed of one or more cells
Which of those sentence is TRUE ?
Phospholipids increase the fluidity of the membrane
none of the above
prokaryotic cells evolved from eukaryotic cells millions of
plasma membrane allows all substances to pass through
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
