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Pregunta 1
Pregunta
The exchange of respiratory gases in a cell takes place through the:
Respuesta
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lungs
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vacuoles
-
stoma
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cell membrane
Pregunta 2
Pregunta
cell membrane mostly consists of
Respuesta
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carbohydrates and lipids
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carbohydrates and nucleic acid
-
protein and carbohydrates
-
protein and lipids
Pregunta 3
Pregunta
in cells, the selectivity of the cell membrane is closely associated with the maintenance of:
Respuesta
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homeostasis
-
plasmolysis
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phagocytosis
-
pinocytosis
Pregunta 4
Pregunta
During which process do molecules move from a region of higher concentration to a region of lower concentration?
Respuesta
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diffusion
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active transport
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cyclosis
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circulation
Pregunta 5
Pregunta
Osmosis is a physical process most closely associated with the life function of:
Respuesta
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absorption
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respiration
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locomotion
-
reproduction
Pregunta 6
Pregunta
Normally, the process of osmosis, the net flow of water molecules into or out of the cell depends on the difference in the:
Respuesta
-
concentration of water molecules inside and outside the cell
-
concentration of enzyme on either side of the cell membrane
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rate of molecular motion on either side of the cell membrane
-
rate of movement of insoluble molecules inside the cell
Pregunta 7
Pregunta
If red blood cells are placed in distilled water, they will eventually be destroyed. Which process is most likely to be the chief cause of this destruction?
Respuesta
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hydrolysis
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dehydration synthesis
-
osomosis
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plasmolysis
Pregunta 8
Pregunta
The destruction of all ATP (energy) molecules in a cell would interfere most immediately with the process of:
Respuesta
-
diffusion
-
gas exchange
-
osmosis
-
active transport
Pregunta 9
Pregunta
Active transport of certain proteins from a cell's environment into the cell is most closely associated with the:
Respuesta
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cell membrane
-
cell wall
-
ribosome
-
nuclolus
Pregunta 10
Pregunta
Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of:
Respuesta
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diffusion
-
passive transport
-
osmosis
-
active transport
Pregunta 11
Pregunta
during which process is ATP not essential?
Respuesta
-
active tranport
-
passive transport
-
phagocytosis
-
pinocytosis
Pregunta 12
Pregunta
The process of osmosis would explain the net movement of water into a cell if the percentage of:
Respuesta
-
water was 90% inside the cell and 95% outside the cell
-
water was 95% inside the cell and 90% outside the cell
-
protein was 30% inside the cell and 35% outside the cell
-
water and protein was equal inside and outside the cell
Pregunta 13
Pregunta
Freshwater protozoa may be distinguished from many marine protozoa by the fact that the freshwater species contain:
Respuesta
-
plasma membranes
-
contractile vacuoles
-
chromosomes
-
cytoplasm
Pregunta 14
Pregunta
An important role of the cell membrane is to:
Respuesta
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store materials
-
change the rate of which chemical reactions occur
-
constructs proteins for the cells
-
maintain homeostasis
Pregunta 15
Pregunta
the cell membrane is said to be selectively permeable because it
Respuesta
-
is ultra thin and flexible
-
composed of lipids and proteins
-
allows only certain molecules to move through it
-
allows all molecules to pass through it, but only very slowly
Pregunta 16
Pregunta
what happens during diffusion?
Respuesta
-
molecules move automatically from an area of higher concentration to an area of lower concentration
-
molecules are pumped from an area of lower concentration to an area of higher concentration
-
an enzyme joins with a particular molecule
-
a catalyst speeds up the rate if a chemical reaction
Pregunta 17
Pregunta
during passive transport
Respuesta
-
the cell uses energy to move molecules across the cell membrane
-
molecules loves across the cell membrane without the use of energy
-
the cell uses energy to break chemical bonds
-
chemical bonds are broken without the use of energy
Pregunta 18
Pregunta
a plant cell shrinks when placed in salt water due to the movement of
Respuesta
-
salt molecules in the cell
-
water molecules out of the cell
-
salt molecules out of the cell
-
water molecules in the cell
Pregunta 19
Pregunta
a plant cell shrinks when placed in salt water due to the movement of
Respuesta
-
salt molecules in the cell
-
water molecules out of the cell
-
salt molecules out of the cell
-
water molecules in the cell
Pregunta 20
Pregunta
placing limp celery in water will make the celery stalk firm again due to
Respuesta
-
osmosis
-
active transport
-
gravity
-
a catalyst
Pregunta 21
Pregunta
the organelle that stores water for the cell is the
Respuesta
-
chloroplast
-
vacuole
-
lysosomes
-
golgi complex
Pregunta 22
Pregunta
a red blood cell placed in distilled (100%) water will swell and burst due to the diffusion of
Respuesta
-
salt out of the cell
-
salt into the cell
-
water out of the cell
-
water into the cell
Pregunta 23
Pregunta
some single-celled organisms live in fresh water (100% water) lakes. what problem do they encounter on a daily basis?
Respuesta
-
water is diffusing through their cell membrane and they may burst if it is not removed
-
water is diffusing out of their cell membrane and may shrivel up and die if water is not pumped back into the cell
-
both a and b
-
they do not encounter any problems living in the freshwater lake
Pregunta 24
Pregunta
human blood cells placed in a 2% salt solution appear to shrink, but those placed in a 0.4% salt solution burst. which statement best supports these observations?
Respuesta
-
salt causes cell walls to swell
-
salt is actively transported across the cell membranes
-
the nucelus does not regulate water balance in a cell
-
osmosis may be occur in either direction across the cell membrane
Pregunta 25
Pregunta
which process would include a net movement of sugar molecules through a membrane from a region of lower concentration to a region of higher concentration
Respuesta
-
osmosis
-
diffusion
-
passive transport
-
active transport
Pregunta 26
Pregunta
In the human body, potassium is small and can pass easily through the cell membrane. potassium is constantly diffusing out of the cell. however, there is always a higher concentration of potassium inside cells and a lower concentration outside of the cells. what process is responsible for maintaining this concentration gradient?
Respuesta
-
osmosis
-
diffusion
-
passive transport
-
active transport
Pregunta 27
Pregunta
when a cell uses energy to move materials across the cell membrane, the process is known as
Respuesta
-
osmosis
-
diffusion
-
passive transport
-
active transport
Pregunta 28
Pregunta
the net movement of molecules across the cell membrane is dependent upon the
Respuesta
-
selectivity of the cell membrane
-
selectivity of the cell wall
-
both a and b
-
neither a or b
Pregunta 29
Pregunta
a process that requires energy by cell and is used to engulf large macro-molecules is called
Respuesta
-
phagocytosis
-
endocytosis
-
exocytosis
-
both a and b
Pregunta 30
Pregunta
what happens during active transport
Respuesta
-
substances are moved from areas of high concentration to areas of low concentration with the use of energy
-
substances are moved from areas of low concentration to areas of high concentration without the use of energy
-
substances are moved from areas of high concentration to areas of low concentration without the use of energy
-
substances are moved from areas of low concentration to areas of high concentration with the use of energy
Pregunta 31
Pregunta
the sodium-potassium pump of a cell is located in
Respuesta
-
a protein molecule of the cell membrane
-
a lipid molecule of the cell membrane
-
an ATP molecule of the cell membrane
-
an ADP molecule of the cell membrane
-
in the cytoplasm
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