(Copied) True/False Questions Chapter 5 Biology
Proteins
"Gated" ion channels are controlled by:
d) Endocytosis
A cell must expand energy to transport substances using a) Diffusion b) Facilitated diffusion c) Osmosis d) Endocytosis
True
A cell with high turgor pressure is probably in a hypotonic solution
3,2
According the sodium-potassium pump, as __ ions leave, __ ions enter the cell
Phagocytosis
Bacteria ingest food through the process of:
True
Brownian motion takes place even at equilibrium.
Facilitated diffusion
Carrier proteins are important in:
Swell
Carrots placed in a hypotonic solution will:
True
Contractile vacuoles collect excess water and squeeze it out of the cell
True
Contractile vacuoles remove water from cells
The swelling and bursting of animal cells when water enters is called
Cytolysis
False
Cytolysis occurs when water leaves the cell and the cell wilts
Hypotonic- Concentration of solute molecules is higher inside cell. Water enters to dilute. Cell Expands. Hypertonic- Concentration of solute molecules is higher outside cell. Water leaves to dilute. Cell shrinks. Isotonic- Concentration of solute is balanced outside/inside cell, water moves in both directions
Describe the following solutions- Isotonic, hypotonic, hypertonic
2 types of endocytosis are pinocytosis which ingest solute and fluids into the cell with the use of energy. And phagocytosis is when it ingests food particles with the use of energy.
Describe the two types of endocytosis
Passive Transport
Diffusion and osmosis are examples of:
Passive transport
Diffusion and osmosis are examples of:
False
Diffusion occurs only in living systems
Down the concentration gradient
During Diffusion molecules tend to move
Down their concentration gradient
During diffusion, molecules tend to move:
True
Endocytosis is a form of active transport.
Mitochondria
Energy for active transport comes from a cell's
Endocytosis is when cells ingest larger particles, and Exocytosis is movement of large particles out of the cell. They both are active transport(uses energy).
Explain the difference between Endocytosis and exocytosis
Water leaves the cell to dilute salt water: cells shrink: plasmolysis
Explain what happens when a freshwater plant is placed in seawater
The salt releases water to dilute the solute, which then causes the cell to shrivel up and die.
Explain what happens when salt is poured on a slug...
Are specific for substances they transport
Facilitated diffusion carrier proteins and cell-membrane pumps both:
molecules that are not soluble in lipids
Facilitated diffusion is often used to transport
Non soluble lipids
Facilitated diffusion is often used to transport:
False
Facilitated diffusion requires a net absorption of energy
False
Gated channels provide a mechanism for active transport
Facilitated diffusion
Glucose enters a cell by:
Movement of materials in and out the cell
Homeostasis is:
True
In active transport, energy is required to move a substance across a cell membrane.
ATP
It is the molecule that provides the energy for active transport
True
Membranes are selectively permeable if they are allow only certain substances to diffuse across them.
Passive Transport
Movement of molecules in response to a concentration gradient:
Diffusing through Na+ ion channels
Na+ ions enter the cells by
Diffusion
Osmosis is a form of:
True
Osmosis is diffusion of water through a membrane.
False
Oxygen molecules enter the cell by osmosis
Ion Channels
Passages that permit a cell membrane to be permeable:
Water
Passes through the cell membrane through the process of osmosis
Cell energy
Passive Transport is defined as the movement of any substances across a membrane without the use of:
Endocytosis
Pinocytosis and phagocytosis and both examples of:
False
Pinocytosis and phagocytosis are examples of exocytosis
move into the cell
Placing an animal cell in a hypotonic solution will cause water to
shriveling
Plasmolysis refers to cell's:
Oxygen
Substances that can pass through cell membranes by diffusion include:
sodium-potassium pump
The cell must use energy to transport substances by using:
Hypotonic
The contractile vacuole of a paramecium is active when the paramecium is in ______enviroment
A hypotonic solution
The contractile vacuole of a paramecium should be active when the paramecium is in
Concentration gradient
The difference in concentrations of a substance across space is:
splitting of ATP
The energy needed to power the sodium-potassium pump is provided by the
Cell wall
The extent to which a plant cell will swell is limited by the:
turgor, plasmolysis
The loss of water from a cell can result in a change from __ to __
False
The outermost surface of cell membranes is hydrophobic
Cell membrane
The part of the cell that functions to maintain homeostasis relative the cell's environment.
Facilitated diffusion
The passive form of carrier transport is called:
Turgor Pressure
The pressure inside a plant cell caused by water pushing against the cell wall is called
Plasmolysis
The shrinking of plant cells when water leaves so the cell membrane pulls away from the cell wall is called
True
The sodium-potassium pump moves ions against the concentration gradient.
Na+ out of the cell and K+ into the cell
The sodium-potassium pump transports
Solute
The substance that dissolves to make a solution is called the
Cell
The word cyto- means
To eat
The word part phago- means:
To drink
The word part pino- means:
Osmosis
Water enters the cell by:
Plasmolysis
What describes the condition of a cell wall that wilts as a result of water loss?
When cells ingest larger particles with using energy
What is endocytosis
Way for cells to release large molecules, such as proteins, by using energy
What is exocytosis?
Bursting of cells
What is meant by cytolysis
Ingest large food particles into the cell using energy (Active Transport)
What is meant by phagocytosis
To maintain water balance they collect and pump excess water.
What is the function of contractile vacuoles in freshwater organisms
Undergoes cytolysis
When a human red blood cell is placed in a hypotonic environment, it will:
Wilts
When cells in a plant have low turgor pressure, the cell
An area of high concentration to an area of low concentration
When molecules move down the concentration gradient it means they are moving from
Equilibrium
When the concentration of a solute is the same throughout a system, the system has reached
true
When the concentrations of solutes outside and inside the cell are equal, the cell is isotonic.
Is rigid
When turgor pressure of a cell is high a plant:
Fluids move in
Which occurs in pinocytosis