Biology 1001 Exam 2 Dr.Nita LSU QUESTIONS WITH ANSWERS
RATED A+
_______ is a process by which molecules dissolved in fluids move; is relatively slow - diffusion
the ________ encloses the cell and allows interactions between the cell and its environment - cell
membrane
what consist of proteins embedded in a bilayer of phospholipids ? - plasma membrane
_______ proteins allow specific molecules to pass into or out of the cell - channel
______ proteins blind messenger molecules and initiate a cells response to the message -
receptor
the ______ consist of all the fluid and structures inside the plasma membrane but outside the
nucleus in eukaryotes - cytoplasm
________ is the fluid portion of the cytoplasm - cytosol
what does cytosol contain? - water, salts, and organic molecules
the ______ consist of a variety of protein filaments - cytoskeleton
what do the protein filaments do? - -provide support and transport structures within the cell
-allow cells to move and change shape
-play a role in cell division
______ guides construction of cell parts/proteins - RNA
what is DNA? - deoxyribonucleic acid
DNA _____ an inherited set of instructions in segments called genes - encodes
DNA genes are copied to _______ - ribonucleic acid (RNA)
______ are simpler than eukaryotes - Prokaryotes
Prokaryotes are ______ - unicellular
prokaryotes make up two of life's domains, _____ and ______ - archaea and bacteria
nearly all prokaryotic cells are surrounded by a ______. - cell wall
, ________ is able to produce a protein to make the cell antibiotic resistant - plasmid
what does the cell wall do? - provide protection and helps the cell maintain its shape
_____ are surface proteins that project from the cell walls of many bacteria - pili
what are the two types of pili? - Attachment and sex
what do attachment Pili do? - help bacteria adhere to surfaces
what do sex pili do? - form connections between adjacent bacteria that allow them to transfer
plasmids
_____ extend from the cell surface. - flagella
flagella rotate and propel the cell through ______ ______. - fluid environments
_______ proteins is the principle component of bacterial flagella - flagellin
what surrounds the exterior of the cell providing biochemical and structural support -
extracellular matrix
______ is always present in plants in animal eukaryotes, but not in prokaryotes and biofilm in
bacteria producing - extracellular matrix
_______ move the cell through fluid or move fluid past the cell surface - cilia
cilia are absent in ____________ and present in _______. - absent - prokaryotes & eukaryote
plants
present- eukaryote animals
______ also move cell through fluid - flagella
flagella are present in _________ and _________ but absent in ________. - present in
prokaryotes and eukaryotic animals
absent in eukaryotes plants
the ______ isolates the cell contents from the environment; regulates movement of materials into
and out of the cell; allows communication with other cells - plasma membrane
what is the plasma membrane present in? - prokaryotes and eukaryotes (plants and animals)
_______ contains chromosomes and nucleoli - nucleus
what is a nucleus absent in? - prokaryotes
RATED A+
_______ is a process by which molecules dissolved in fluids move; is relatively slow - diffusion
the ________ encloses the cell and allows interactions between the cell and its environment - cell
membrane
what consist of proteins embedded in a bilayer of phospholipids ? - plasma membrane
_______ proteins allow specific molecules to pass into or out of the cell - channel
______ proteins blind messenger molecules and initiate a cells response to the message -
receptor
the ______ consist of all the fluid and structures inside the plasma membrane but outside the
nucleus in eukaryotes - cytoplasm
________ is the fluid portion of the cytoplasm - cytosol
what does cytosol contain? - water, salts, and organic molecules
the ______ consist of a variety of protein filaments - cytoskeleton
what do the protein filaments do? - -provide support and transport structures within the cell
-allow cells to move and change shape
-play a role in cell division
______ guides construction of cell parts/proteins - RNA
what is DNA? - deoxyribonucleic acid
DNA _____ an inherited set of instructions in segments called genes - encodes
DNA genes are copied to _______ - ribonucleic acid (RNA)
______ are simpler than eukaryotes - Prokaryotes
Prokaryotes are ______ - unicellular
prokaryotes make up two of life's domains, _____ and ______ - archaea and bacteria
nearly all prokaryotic cells are surrounded by a ______. - cell wall
, ________ is able to produce a protein to make the cell antibiotic resistant - plasmid
what does the cell wall do? - provide protection and helps the cell maintain its shape
_____ are surface proteins that project from the cell walls of many bacteria - pili
what are the two types of pili? - Attachment and sex
what do attachment Pili do? - help bacteria adhere to surfaces
what do sex pili do? - form connections between adjacent bacteria that allow them to transfer
plasmids
_____ extend from the cell surface. - flagella
flagella rotate and propel the cell through ______ ______. - fluid environments
_______ proteins is the principle component of bacterial flagella - flagellin
what surrounds the exterior of the cell providing biochemical and structural support -
extracellular matrix
______ is always present in plants in animal eukaryotes, but not in prokaryotes and biofilm in
bacteria producing - extracellular matrix
_______ move the cell through fluid or move fluid past the cell surface - cilia
cilia are absent in ____________ and present in _______. - absent - prokaryotes & eukaryote
plants
present- eukaryote animals
______ also move cell through fluid - flagella
flagella are present in _________ and _________ but absent in ________. - present in
prokaryotes and eukaryotic animals
absent in eukaryotes plants
the ______ isolates the cell contents from the environment; regulates movement of materials into
and out of the cell; allows communication with other cells - plasma membrane
what is the plasma membrane present in? - prokaryotes and eukaryotes (plants and animals)
_______ contains chromosomes and nucleoli - nucleus
what is a nucleus absent in? - prokaryotes
