bio test
The part of the cell that is most important in maintaining homeostasis with the cell's environment is the ...
cell membrane
Unicellular freshwater organisms find themselves in a hypotonic solution. In order to get rid of excess water that diffuses into the cells, these organisms use .....
contractile vacuoles
Which of the following cell structures are involved in exocytosis involving packaged proteins?
golgi apparatus
Sea water is approximately 3% salt. Sea water is hypertonic to the tissues of freshwater fish. Therefore we can conclude that the tissues contain .......% salt.
less than 3%
Both facilitated diffusion and active transport make use of carrier molecules that change shape and move substances through the membrane. These molecules are made of .....
proteins
Red blood cells contain 0.9% salt. Which of the following solutions would be hypotonic to the blood?
0.09%
Red blood cells contain 0.9% salt. Which of the following solutions would be isotonic solutions to the blood?
0.9% salt
Which one of the following DOES NOT BELONG?
Active
What will happen to an animal cell placed in a salt water solution?
The cell will shrink
The process of facilitated diffusion requires
carrier protein,no input of energy from the cell,a downhill gradient
The bursting of cells due to osmosis is called ...
cytolysis
Substances that are much too large to pass through the cell membrane may still get into the cell through the process of .....
endocytosis
Which of the following is NOT a type of passive transport?
endocytosis
Active transport requires:
energy
In an attempt to replenish the body fluids, a patient (who has had serious hemorrhage) accidentally receives a large transfusion of distilled water directly into one of his veins. This would probably .....
have serious, perhaps fatal effects because the red blood cells would tend to burst
Which of the following would be an example of osmosis?
he shriveling of a snail after salt is poured on it
A state of biological balance maintained by living organisms is called .....
homeostasis
Which prefix means "greater than"?
hyper
A solution that contains a higher level of salts than found in cells is said to be .....
hypertonic
Carrot sticks that are left in a dish of freshwater for several hours become stiff and hard. Similar sticks left in a saltwater solution become limp and solf. From this we can deduce that the freshwater is ______ and the saltwater is ________ to the cells of the carrot sticks.
hypotonic / hypertonic
When the process of diffusion reaches an equilibrium state:
molecules continue to move but in equal amounts
Movement of substances across the membrane without the use of cellular energy is termed ......
passive transport
The engulfing or swallowing of large objects by amebas or white blood cells is called .....
phagocytosis
Which of the following is a type of active transport?
sodium potassium pump endocytosis exocytosis
Chamber A contains 40% helium and Chamber B contains 20% helium. Chambers are connected by a tube the molecules are free to cross. Which of the following will occur?
some helium will move from chamber A to chamber B
An animal cell placed in a hypotonic solution will:
take on water
A beaker is divided into two halves, A & B, by a membrane that is freely permeable to the water and NaCl but not to protein. Side A is half-filled with a solution of 8% protein, while side B is half filled with a 2% protein solution. After time goes by, it is found that in side A ......
the number of water molecules has increased
Which of the following would be an example of simple diffusion?
the smell of ammonia spreading throughout the room
One common example of active transport is ....
the sodium-potassium pump
The pressure that builds up in plant cells due to osmosis and the strength of the cell walls is called ...
turgor
A beacher is divided into two halves, A & B by a membrane freely permeable to the water but not to glucose. Side A is filled with a solution of water with 2% glucose, while side B is filled with water and 4% glucose. Which best describes what will happen to this system.
water will move in both directions but mostly from A to B
