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The fluid behavior of the plasma membrane results primarily from the...
flexibility of the lipid components
in newly forming plant cells the wall that surrounds the plasma membrane is referred to as the
primary cell wall
Not all substances can cross the cell membrane, for this reason the cell membrane is said to be
What cellular process involves an inward sinking of a small patch of membrane to form a cytoplasmic
water constantly moves into the freshwater Paramecium because the cell is ______ relative to its environment
Four of the five choices listed below are bound by membranes.
chromoplast, vacuole, mitochondrion, lysosome
ribosomes do not have membranes
Which of the following is true of the transport proteins in the plasma membrane?
they span the lipid bilayer
A major difference between plant cell mitosis and animal cell mitosis is the absence in plant cells of
The fluid filled sac that may store food, ions, or water in plant cells and is involved in fluid pressure is
The capacity of a cell to exhibit movement or mobility is generally attributed to which cellular component?
What is a role of proteins found in eukaryotic plasma membranes
regulating flow of materials through the membrane
Which cellular process involves an inward sinking of a small patch of membrane to form a cytoplasmic vesicle?
The system of canals, tubes, and sacs that transports molecules inside the cytoplasm is the
are discrete, recognizable bodies in cytoplasm, are membrane bound compartments, are typical eukaryotic cells, separate chemical reactions in time and space
Glycoproteins differ from other membrane proteins in that they
have chains of a polysaccharide associated with them and they aid the immune system
what is the correct sequence of polypeptide transport in the secretory pathway
ribosome, ER, Golgi Bodies, Plasma Membrane
which of the following is not required for cell function
transport mechanisms to bring substances in from outside of the cell
of the objects listed, which is the smallest that you can see without the aid of a microscope?
Hooke was the first to observe cells under a simple microscope in the 1600s because he was looking at
plant cells in which the thick cell wall was clearly visible.
What is the fate of defective or malfunctioning organelles in cells?
they accumulate in the cytoplasm eventually resulting in cell death
movements of individual water molecules through a cell membrane from a higher concentration toward a lower concentration is called
The organelle that pinches off portions of its membrane to form a compartment used for storage or transport is the
are either bacteria or archeans, may have cell walls, are unicellular, have nucleoid regions
a hypothetical microbullet shot through a phospholipid bilayer would pass the components in which order?
head, tail, tail, head
in an attempt to visualize the fluid mosaic model of a membrane we could describe the ____ as floating in a sea of ____
which of the following affects the rate of diffusion through a selectively permeable membrane?
I. Concentration Gradient
III molecular size
four of the five choices listed below are characteristics of plasm membrane the exception is
inert and impermeable
the term cell comes from this scientis's work and his description of the compartmenetaiton he saw this slices of corks
plasma membranes incorporate
receptor proteins, transport proteins, recognition proteins, adhesion proteins
sodium ions cross a membrane through transport proteins that receive an eneregy boost this is an example
of active transport
the net movement of molecules from a high concentration to a low concentration is descrived by which of the following
a phospholiid has a phosphate containing head and two fatty acid tails attached to a backbone of
scientists demonstrated the fluidity of plasma membrane proteins by
fusing the membranes of two different species
is a process whereby molecules move from an area of low to high concentration, moves ions against a concentration gradient, involves use of energy, and counteracts the process of diffusion
if a plant synthesizes a secondary cell wall it is laid down
between plasma membrane and the primary cell wall
which of the following statements about the plant cell wall is not ture?
the middle lamella is laid down between the primary and secondary walls
which of the following structures would probably be least damaged by a fat or lipid dissolving solvent
salt is spread on clay tennis courts to kill weeds.based on your study of biology, how would you explain the process through which the weeds are killed
water diffused out of the the plant cells thereby weakening or killing them by plasmolysis
the membrane of pectin that is laid down between two daughter cells during cytokinesis is called the
which is a characteristic of all life on earth
cells must take in raw materials, cells must take in enerfy, cells must build biological molecules, the cellular interior must be isolated from the environment
if lysosomes burst inside a cell the immediate result is likely to be
the cell will be digested from within
vesicles derived from the ER make their way to the ____, an organelle that functions in packaging, storage, and disribution
the double membrane systems around the cell's organelles are really two membranes, each of which may be referred to as a
none of these
the primary structural difference between plant and animal cells is that most plant cells are
enclosed by a cell wall
cell structures that apparently function in controlling the addition of cellulose to the cell wall, in steering vesicles from the golgi bodies to the cell wall and in aiding movement within the cell are
which of the following objects found in living cells is not bound by a membrane or membranes?
cell turgor pressure is increased when the cell is transferred to an external medium having
a higher concentration of water than the cell
which of the follwing reactions requires the removal of water to form covalent bond?
glucose plus galactose is lactose
which of the following macromolecules is composed of monomer units containing a sugar, a phosphate group, and a nitrogen containing base
the energy produced in the mitochondrion is made available to the cell in the form of which of the following molecules
the nucleotide ATP
a cell has the following molecules and structures: enzymes, dna, ribsomes, plasma membrane, and mitochondria. it could be a cell from
a plant or an animal
which organelle extracts energy from food molecules and stores it in the high energy bonds of ATP
cardiac muscles consume more energy than any other type of cell. which organelle would you expect to be most abundant in cardiac muscle cells
microtubules are responsible for all of the following except
pinching off the cytoplasm at eukaryotic cell division
proteins destined to be secreted from the cell are often modified in the golgi apparatus by the addition of
mitochondria are often called the powerhouses of the cell because they
are the site of energy producing reaction that power most cellular activities
which of the following cell structures would be found in an animal cell, but not in a bacterial cell?
Eukaryotic cells differ from prokaryotic cells in all of the following except that
eukaryotic cells have very little DNA compared to prokaryotic cells
electron microscopes and light microscopes work the same way in principle but differ in that electron microscopes
can resolve much smaller structures, use beams of electrons to illuminate the specimen instead of light, can visualize the inside of a cell, use magnets to focus the illumination instead of flass lenses
what is the fate of defective or malfunctioning organelles in cells?
they are broken down by lysosomal digestive enzymes
a plant cell adapted for waste storage and disposal would probably contain a large number of
how do substances move through the golgi apparatus?
they are carried in vesicles from one part of the Goli apparatus to the next and they are carried in vesicle membranes from one part of th eGolgi apparatus to the net
which pair of organelles is responsible for energy supply to eukaryotic cells
chloroplasts and mitochondria
which statement accurately describes the interaction between ER, ribosomes, and Golgi bodies in the export of protein from the cell?
ribosomes manufacture proteins which travel through the ER to be packaged by the Golgi bodies for export
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