Cell Design
The primary function of the cell's membrane is to:
selectively permit or restrict substances from entering or leaving the cell
A chemical substance coming from an organism
biochemical
Rod-shaped structure contains the genes
chromosome
Of the five transport mechanisms, which one will the cell utilize if the substance being transported is insoluble?
facilitated diffusion
molecules helped by protein, move insoluble molecules across plasma membrane
facilitated diffusion
transports glucose, amino acids
facilitated diffusion
Energy is always required to force molecules to move from areas of high concentration to areas of low concentration.
false
Of the following types of transport, which two may the cell utilize if a large molecule or organism cannot pass through the membrane?
pinocytosis, phagocytosis
The outer layer of a cell which acts as a gatekeeper to the cell is called the
plasma membrane
Having slightly negative and positive charged ends
polar
A long chain molecule made up of amino acids
protein
a dog being dragged into a bathtub against its will
active transport
molecules "pumped" in or out from low to high concentration
active transport
The chemical unit or building block of protein
amino acid
Causes the separation of the cytoplasm
cytokinesis
The natural tendency of molecules to move from higher to lower concentrations is:
diffusion
a dog pulled on a wagon through a spring loaded door
facilitated diffusion
Sodium and potassium need to be pumped and not just travel by passive or facilitated diffusion because the cell is concentrating sodium and ridding itself of potassium.
false
The cell mechanism of "active transport" involves the transport of insoluble chemicals across the membrane with protein acting as the carrier.
false
The phospholipid molecule has two ends, the nonpolar charged end and the polar uncharged end.
false
The concentration of K+ within a cell is required to be than the external concentration.
higher
The concentration of Na+ within a cell is required to be than the external concentration.
lower
Active transport requires energy because it moves molecules from a to a concentration against diffusion.
lower, higher
A group of biochemicals including DNA and RNA
nucleic acid
cell engulfs microorganisms in cell "eating"
pagocytosis
a crowded roomful of people gradually standing up, wandering around, and leaving the room
passive diffusion
molecules move in and out freely from high to low concentration
passive diffusion
transports sodium, potassium
active transport
Having two layers
bilayer
The plasma membrane has a of with dispersed throughout.
bilayer, phospolipid, proteins
oxygen, carbon dioxide
passive diffusion
a child eating a doughnut
phagocytosis
Makes up the plasma membrane together with protein
phospolipid
a woman drinking tea
pinocytosis
cell engulfs molecules in cell "drinking"
pinocytosis
transports proteins, nucleic acids
pinocytosis
Segments of DNA contained on chromosomes
genes
Blood sugar used by the cells in the production of energy
glucose
A plasma membrane and a cell wall:
have different structures and different functions
When is facilitated diffusion necessary?
when the molecules are insoluble
When the required direction of transport is opposed to concentration levels, a cell expend energy to force across its membrane.
will, ions
Which statement(s) corresponds to cellular respiration?
CO2 diffuses passively out of the cell,O2 diffuses passively and then is converted to CO2
The energy required for the mechanism of "active transport" comes from:
the product of ATP decomposition
Why do O2 and CO2 pass through the plasma membrane?
they are nonpolar and soluble
Glucose will pass through a cell membrane with the aid of
proteins
The role of protein in facilitated diffusion is to move insoluble molecules across the plasma membrane; diffusion supplies the power.
true