BIOS 251 EXAM 2 | QUESTIONS AND ANSWERS | VERIFIED AND
WELL DETAILED ANSWERS | ALREADY GRADED A+ | LATEST
EXAM
process by which a cell takes material into the cell by infolding of the cell
membrane
endocytosis
part of eukaryotic cell division during which the cell nucleus divides
characteristics:
1. development of an individual, composed of some 50 trillion cells, from a
one-celled fertilized egg
2. growth of all tissues and organs after birth
3. replacement of cells that die
4. repair of damaged tissues.
Mitosis
Chromosomes become visable and releases into the cytosol, nuclear envelop
dissolves, spindle fibers form, centrioles lie at each pole of cell, and spindle
fibers then tug the chromosomes back and forth until they line up along the
midline of the cell.
Prophase
the chromosomes line up across the center of the cell
Metaphase
Phase of mitosis in which the chromosomes separate and move to opposite
ends of the cell
sister chromatids are generally identical
Anaphase
daughter chromosomes cluster on each side of the cell, rough ER produces a
new nuclear envelope around each cluster, and the chromosomes begin to
uncoil and return to the thinly dispersed chromatin form, mitotic spindle
breaks up and vanishes.
,Telophase
division of the cytoplasm to form two separate daughter cells
Cytokinesis
The time between two successive M phases.
Interphase
The synthesis phase of the cell cycle; the portion of interphase during
which DNA is replicated
S phase
Growth phase. Longest phase of cell cycle. produces extra organelles.
G1 phase
Prepare for mitosis. Make microtubules. further cell growth and
organization of cellular contents
G2 Phase
Differences between mitosis and meiosis
1. Meiosis has two rounds of genetic separation (mitosis twice) and cellular
division while mitosis only has one of each.
2. In meiosis, homologous chromosomes separate leading to daughter cells
that are not genetically identical. In mitosis the daughter cells are
identical to the parent as well as to each other.
3. Meiosis produces gamete cells and mitosis produces diploid cells
4. Meiosis produces 4 cells and mitosis produces 2
a type of cell division that results in four daughter cells each with half the
number of chromosomes of the parent cell, as in the production of gametes.
Meosis
Prevents escape of cell contents; regulates exchange of materials between
cytoplasm and extracellular fluid; involved in intercellular communication
plasma membrane
Increase absorptive surface area; widespread sensory roles (hearing,
equilibrium, taste)
microvilli
,Move substances along cell surface; widespread sensory roles (equilibrium,
smell, vision)
Cilia
hair-like projection on a sperm cell that makes it motile
flagellum
Give shape and physical support to cell; anchor cells to each other and to
extracellular material; compartmentalize cell contents
intermediate filaments
Support microvilli and plasma membrane; involved in muscle contraction
and other cell motility, endocytosis, and cell division
microfilaments
Form axonemes of cilia and flagella, centrioles, basal bodies, and mitotic
spindles; enable motility of cell parts; form trackways that direct
organelles and macromolecules to their destinations within a cell
microtubules
Genetic control center of cell; directs protein synthesis; shelters the DNA
nucleus
Protein synthesis and manufacture of cellular membranes
rough ER
Lipid synthesis, detoxification, calcium storage
smooth ER
Interpret the genetic code and synthesize proteins
ribosomes
a cell organelle that helps make and package materials to be transported out
of the cell
golgi complex
Become secretory vesicles and carry cell products to apical surface for
exocytosis, or become lysosomes
golgi vesicles
, Contain enzymes for intracellular digestion, autophagy, programmed cell
death, and glucose mobilization
lysosomes
Contain enzymes for detoxification of free radicals, alcohol, and other
drugs; oxidize fatty acids
peroxisomes
Degrade proteins that are undesirable or no longer needed by a cell
proteasomes
ATP synthesis
mitochondria
Form mitotic spindle during cell division; unpaired centrioles form basal
bodies of cilia and flagella
centrioles
Organizing center for formation of microtubules of cytoskeleton and
mitotic spindle
centrosomes
Point of origin, growth, and anchorage of a cilium or flagellum; produces
axoneme
basal body
Storage products or other products of cellular metabolism, or foreign
matter retained in cytoplasm
inclusions
Solution has a lower concentration of nonpermeating solutes than the
intracellular fluid. Cells in a this solution absorb water, swell, and may
burst.
hypotonic
solution is one with a higher concentration of nonpermeating solutes than
the ICF. It causes cells to lose water and shrivel
hypertonic.
the total concentration of nonpermeating solutes is the same as in the
ICF—hence, they cause no change in cell volume or shape
WELL DETAILED ANSWERS | ALREADY GRADED A+ | LATEST
EXAM
process by which a cell takes material into the cell by infolding of the cell
membrane
endocytosis
part of eukaryotic cell division during which the cell nucleus divides
characteristics:
1. development of an individual, composed of some 50 trillion cells, from a
one-celled fertilized egg
2. growth of all tissues and organs after birth
3. replacement of cells that die
4. repair of damaged tissues.
Mitosis
Chromosomes become visable and releases into the cytosol, nuclear envelop
dissolves, spindle fibers form, centrioles lie at each pole of cell, and spindle
fibers then tug the chromosomes back and forth until they line up along the
midline of the cell.
Prophase
the chromosomes line up across the center of the cell
Metaphase
Phase of mitosis in which the chromosomes separate and move to opposite
ends of the cell
sister chromatids are generally identical
Anaphase
daughter chromosomes cluster on each side of the cell, rough ER produces a
new nuclear envelope around each cluster, and the chromosomes begin to
uncoil and return to the thinly dispersed chromatin form, mitotic spindle
breaks up and vanishes.
,Telophase
division of the cytoplasm to form two separate daughter cells
Cytokinesis
The time between two successive M phases.
Interphase
The synthesis phase of the cell cycle; the portion of interphase during
which DNA is replicated
S phase
Growth phase. Longest phase of cell cycle. produces extra organelles.
G1 phase
Prepare for mitosis. Make microtubules. further cell growth and
organization of cellular contents
G2 Phase
Differences between mitosis and meiosis
1. Meiosis has two rounds of genetic separation (mitosis twice) and cellular
division while mitosis only has one of each.
2. In meiosis, homologous chromosomes separate leading to daughter cells
that are not genetically identical. In mitosis the daughter cells are
identical to the parent as well as to each other.
3. Meiosis produces gamete cells and mitosis produces diploid cells
4. Meiosis produces 4 cells and mitosis produces 2
a type of cell division that results in four daughter cells each with half the
number of chromosomes of the parent cell, as in the production of gametes.
Meosis
Prevents escape of cell contents; regulates exchange of materials between
cytoplasm and extracellular fluid; involved in intercellular communication
plasma membrane
Increase absorptive surface area; widespread sensory roles (hearing,
equilibrium, taste)
microvilli
,Move substances along cell surface; widespread sensory roles (equilibrium,
smell, vision)
Cilia
hair-like projection on a sperm cell that makes it motile
flagellum
Give shape and physical support to cell; anchor cells to each other and to
extracellular material; compartmentalize cell contents
intermediate filaments
Support microvilli and plasma membrane; involved in muscle contraction
and other cell motility, endocytosis, and cell division
microfilaments
Form axonemes of cilia and flagella, centrioles, basal bodies, and mitotic
spindles; enable motility of cell parts; form trackways that direct
organelles and macromolecules to their destinations within a cell
microtubules
Genetic control center of cell; directs protein synthesis; shelters the DNA
nucleus
Protein synthesis and manufacture of cellular membranes
rough ER
Lipid synthesis, detoxification, calcium storage
smooth ER
Interpret the genetic code and synthesize proteins
ribosomes
a cell organelle that helps make and package materials to be transported out
of the cell
golgi complex
Become secretory vesicles and carry cell products to apical surface for
exocytosis, or become lysosomes
golgi vesicles
, Contain enzymes for intracellular digestion, autophagy, programmed cell
death, and glucose mobilization
lysosomes
Contain enzymes for detoxification of free radicals, alcohol, and other
drugs; oxidize fatty acids
peroxisomes
Degrade proteins that are undesirable or no longer needed by a cell
proteasomes
ATP synthesis
mitochondria
Form mitotic spindle during cell division; unpaired centrioles form basal
bodies of cilia and flagella
centrioles
Organizing center for formation of microtubules of cytoskeleton and
mitotic spindle
centrosomes
Point of origin, growth, and anchorage of a cilium or flagellum; produces
axoneme
basal body
Storage products or other products of cellular metabolism, or foreign
matter retained in cytoplasm
inclusions
Solution has a lower concentration of nonpermeating solutes than the
intracellular fluid. Cells in a this solution absorb water, swell, and may
burst.
hypotonic
solution is one with a higher concentration of nonpermeating solutes than
the ICF. It causes cells to lose water and shrivel
hypertonic.
the total concentration of nonpermeating solutes is the same as in the
ICF—hence, they cause no change in cell volume or shape
