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CMB Exam Questions And Accurate Answers Latest Update
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CMB Exam Questions And AccurateAnswers Latest Update
Theres 2 different receptors need 2 different molecules to activate and send signal
downstream Uses molecular switch
signal integration
Who are the discoverers of the cell theory?
Schleiden and Schwann
What are the basic components of the cell theory?
-All living things are composed of cells
-Every new cell comes from preexisting cells
-A cell is the smallest functional unit that possess all the characteristics of life
What is the first key concept of the modern cell theory?
Energy flow occurs within cells
What is the second key concept of the modern cell theory?
Heredity information (DNA) is passed on from cell to cell
What is the third key concept of the modern cell theory?
All cells have the same basic chemical composition
Squamos shape
flat (epithelial cells)
Spheroid shape
round (Leukocytes)
stellate shape
star-like (neurons)
fibrous shape
, muscle cells
what is the plasma membrane which is a major component of the cell?
the outermost envelope
what is the cytosol which is a major component of the cell?
fluid component within the cell
what are organelles, major componets of the cell?
ultramicroscopic structures in cytosol that carry out functions of the cell
why is small size better with cells?
Because for any increase in diameter of the cell, the volume increases faster than
surface area.
Eukaryotic cell
has a nucleus containing DNA, interior divided into functional compartments, usually
have organelles and sexual reproduction.
Prokaryote cell
has a nucleoid, lacks nucleus and most organelle, asexual reproduction only.
cell membrane
double layer of phospholipd and proteins, surrounds organelles, provides attatchement
sites.
How does the cell membrane participate in cell-cell recognition
proteins in membranes act as sensors of external signals etc.
Cholesterol
interspered among phospholipid tails
What is a function of cholesterol?
helps hold membrane together while contributing to the fluidity of the membrane
Glycolipids
phospholipids with short chains of carbohydrates on extracellular face
What does the surface area of a cell determine?
The amount of materials that can enter it from the extracellular environment
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