BIO 181 Test
Bank 1
Short answer
essay:
1) Pancake-shaped cells explores the environment – moving
filopodia with receptors extend from
cell
... [Show More] surface all over cell and “sense” environment. (1 point)
2) Then in some area filopodia stop moving due to signal
received (biochemical cascade
changes cell in that area). (1 point)
3) That area restructures to extend large, lamellipodium that
pushes out against the plasma
membrane; the mechanism causing this is a new network of actin
filaments. (1 point)
4) When lamellipodium touches substrate cell-equivalent of super
glue/adhesion plaque holds
substrate. (1 point)
5) Cell equivalent of a muscle (i.e. actin and myosin) assembles
and attaches to adhesion plaque
and extends towards nucleus. (1 point)
6) The muscle contracts pulling the back end of the cell forward. (1
point)
7) The above process repeats itself as cell walks directionally.
The students must mention that
the process repeats (ie you can’t tell if a person is walking if they just
stick out their left leg.) (1
point)
8) Once directionally moving, cell has front and back end with
lamellipodia at front end, nucleus
towards back end of cell, and retraction fiber at rear of cell. (1 point)
9) Retraction fiber contains cell-equivalent of super
glue/adhesion plaque, thinly stretched (like
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rubber band) plasma membrane with very little cytoplasm. Later
plasma membrane breaks near
adhesion plaque, and plasma membrane on both side seal the
break. Micro Exudate is what cell
leaves behind. (1 point)
Question
bank:
A cell that is anchorage-dependent for growth will also exhibit contact
inhibition.
True
The contractile vacuole of the paramecium is possibly an evolutionary
precursor of the kidney.
True
A single-celled eukaryotic organism:
Has a limited number of biomolecular
machines Must find food, shelter, a
mate and reproduce Escape from
predator
In your own multicellular body, cells with different functions have
different DNA.
False
In Cell Biology what can limit the progress of science?
Technology
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In your own multicellular body, different cells in your body have a
division of labor between them.
True
What limits the paramecium from acquiring more complex functions?
write a sentence
answer here -> _.
Limited number of biomolecular machines
The paramecium swims by way of using a flagella.
False
Compared to bacteria which of the cell types below are not
responsible for finding food”
Lymphoc
yte
Macropha
ge
Fibroblast
A normal cell is anchorage-dependent fo [Show Less]