The association of ribosomes with _____ invaginations would support the _____ theory.
membrane, endomembrane
After a cell is pancake shaped in a
... [Show More] cell culture dish, the order of events that occurs as a cell walks is?
filapodia, lamellipodia, cell muscle, retraction fiber
T/F It is presumed that the peroxisomes evolved in these primitive, proto-eukaryotes to remove oxygen, which was toxic to the primitive cells.
true
T/F In an extant prokaryotic cell the outer boundary of life is the capsule.
false
T/F When cancer cells are crowded by surrounding cells, the cancer cells become spherical and they can still go through cell division.
true
T/F Loss of the cell wall was required for the endomembrane system theory.
true
T/F Fluorescence microscopy is form of light microscopy
true
T/F Loss of the cell wall is required for the endosymbiotic theory.
true
T/F TEM provides a thin, two-dimensional section of the object being studied.
true
T/F The sytoskeleton enabled the primitive cell to become motile.
true
T/F the ancient earth did not contain much oxygen
true
A normal cell is _____ and ____ for growth.
mortal, anchorage dependent
T/F Ribosomes bound to some of the membrane invaginations in the endomembrane theory
true
T/F the cytoskeleton gave rise to the nuclear envelope
false
What limits how big a cell can be?
the surface area to volume ratio
T/F DNA in extant prokaryotic cells is circular.
True
Why did Motility improved the fitness of these early cells?
it allowed them to move away from predators and towards food
T./F the end of the retraction fiber touching the cell culture plate still contains the cell equivalent of super glue.
true
T/F the presumed first step in the transition of the primitive, proto-prokaryotic cell into the primitive, proto-eukaryotic cell was the loss of the cell wall.
true
1n order to examine cells which are smaller than can be detected by the human senses what needs to be used ?
technology
A cell that is itself an organism must have a minimum of four needs presented in lecture
find food, find shelter, find mate, and reproduce.
compared to bacteria which of the cell types below are not responsible for finding food?
lymphocyte, macrophage, and fibroblast
T/F In your own mulitcellular body, different cells in your body have a division of labor between them.
true
T/F The paramecium swims by way of using a flagella
false
T/F A normal cell is anchorage-dependent for growth and mortal
true
what limits the paramecium from acquiring more complex functions?
cannot fit anymore biomachinery into its space
comparing a singled cell eukaryotic organism with a multicellular organism such as yourself identify the major difference from the list below.
division of labor
in the cell biology what can limit the progress of science
technology
T/F a cell that is anchorage-dependent for growth will also exhibit contact inhibiton.
true
explain what limits an individual cell from becoming more complex
individual cell have a limit number of biomolecular machines. In a multicellular organism you get a division of labor between different cell types so that the whole can do more than the sum of the parts with similar number of biomolecular machines per cell.
T/F the contractile vacuole of the paramecium is possibly an evolutionary of the kidney
true
a singled celled eukaryotic organism
has a limited number of biomolecular machines
must find food, shelter, a mate and reproduce
escape from predators
the paramecium discussed in class contained an organelle the contractile vacuole. this is the presumed precursor of the:
kidney
T/F in your own multicellular body, cell with functions have different DNA.
False
T/F A cancer cell will be anchorage-dependent for growth and immortal
false [Show Less]