biology 105 chapter 4 with
100% correct answers
(graded A+)
cell theory - answer one of the fundamental concepts of Biology
All organisms consist of one or more cells
A cell is the smallest unit of life, individually alive even as part of a
multicelled organism
All cells come from division of preexisting cells
All cells pass hereditary material to offspring - answer list the 4
generalizations that constitute the cell theory
the plasma membrane, cytoplasm, and DNA - answer what 3 components to
all cells have in common?
plasma membrane - answer A cell's outermost membrane; a lipid bilayer that
separates the cell's contents from it's environment. A selectively permeable
membrane that allows only certain materials to cross, which controls cell -
environment exchanges.
cytoplasm - answer A jelly-like substance of water, sugars, ions, and proteins
enclosed by the plasma membrane. Suspended in this are specialized
organelles, which carry out cell metabolic functions.
DNA - answer A cell's hereditary information that guides development and
other metabolic functions.
In eukaryotic cells, DNA is contained within a two-membrane organelle called
the nucleus - answer what is DNA like in a eukaryotic cell?
, prokaryotes do not have a nucleus, and their DNA is located in a region of
the cytoplasm called the nucleoid - answer what is DNA like in a prokaryotic
cell?
prokaryotic cells - answer (i.e., bacteria, archaea) have a plasma membrane,
cytoplasm, and DNA, but no nucleus; DNA floats in a specialized area of the
cytoplasm called the nucleoid
eukaryotic cells - answer (i.e., protists, plants, fungi, animals) have a plasma
membrane, cytoplasm, and DNA contained in a nucleus
surface-to-volume - answer The greater the ______-__-_____ ratio, the quicker
a cell can respond to environmental signals
inward flow of nutrients and outward flow of wastes across the membrane
will not be fast enough - answer what happens if a cell gets too big?
surface-to-volume ratio - answer Cell size is limited by a physical relationship
called this. When a cell increases in size, its volume increases faster than its
surface area.
phospholipid bilayer - answer nonpolar tails (hydrophobic) of both layers are
sandwiched between the polar heads (hydrophilic)
Separates the cell's internal and external environments
Regulates substance into and out the cell - answer what are the functions of
cell membranes?
fluid mosaic - answer Cell membranes are described as this.
fluid - answer the phospholipids are not chemically bonded to one another
100% correct answers
(graded A+)
cell theory - answer one of the fundamental concepts of Biology
All organisms consist of one or more cells
A cell is the smallest unit of life, individually alive even as part of a
multicelled organism
All cells come from division of preexisting cells
All cells pass hereditary material to offspring - answer list the 4
generalizations that constitute the cell theory
the plasma membrane, cytoplasm, and DNA - answer what 3 components to
all cells have in common?
plasma membrane - answer A cell's outermost membrane; a lipid bilayer that
separates the cell's contents from it's environment. A selectively permeable
membrane that allows only certain materials to cross, which controls cell -
environment exchanges.
cytoplasm - answer A jelly-like substance of water, sugars, ions, and proteins
enclosed by the plasma membrane. Suspended in this are specialized
organelles, which carry out cell metabolic functions.
DNA - answer A cell's hereditary information that guides development and
other metabolic functions.
In eukaryotic cells, DNA is contained within a two-membrane organelle called
the nucleus - answer what is DNA like in a eukaryotic cell?
, prokaryotes do not have a nucleus, and their DNA is located in a region of
the cytoplasm called the nucleoid - answer what is DNA like in a prokaryotic
cell?
prokaryotic cells - answer (i.e., bacteria, archaea) have a plasma membrane,
cytoplasm, and DNA, but no nucleus; DNA floats in a specialized area of the
cytoplasm called the nucleoid
eukaryotic cells - answer (i.e., protists, plants, fungi, animals) have a plasma
membrane, cytoplasm, and DNA contained in a nucleus
surface-to-volume - answer The greater the ______-__-_____ ratio, the quicker
a cell can respond to environmental signals
inward flow of nutrients and outward flow of wastes across the membrane
will not be fast enough - answer what happens if a cell gets too big?
surface-to-volume ratio - answer Cell size is limited by a physical relationship
called this. When a cell increases in size, its volume increases faster than its
surface area.
phospholipid bilayer - answer nonpolar tails (hydrophobic) of both layers are
sandwiched between the polar heads (hydrophilic)
Separates the cell's internal and external environments
Regulates substance into and out the cell - answer what are the functions of
cell membranes?
fluid mosaic - answer Cell membranes are described as this.
fluid - answer the phospholipids are not chemically bonded to one another
