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Chapter 4 Exam

Cells often engulf extracellular particles and fluid, as shown in figure A. This is called ___________ Endocytosis`
The process shown in figure B is called ___________ Exocytosis
Carrier proteins _________ shape to transport to the interior of cells change
Active transport requires the use of _______, by a cell energy
Receptor proteins may act as ___________, catalyzing certain chemical reactions inside the cell Enzymes
Differson of ions through ion channels is a form of _________ transport pass
A cell does not expand ________ when diffusion takes place energy
Receptor proteins can change the __________ of the cell membrane permiability
The diffusion of __________ through cell membranes is called osmosis water
Substances always flow from an area of high concentration to an area of ______ concentration low
When the concentration of free water molecules is higher outside a cell, water will diffuse ______ the cell into
If the interior of a typical cell is negatively charged __________ charged ions will not require energy to diffuse into the cell using an ion channel positively
In ____________ ____________ , carrier proteins do not require energy to transport amino acids into a cell facilitated diffusion
The random motion of particles of a substance that causes the substance to move from an area of high concentration to an area of lower concentration is called ___________ diffusion
The biologist concludes that the molecule moves across cell membranes by facilitated diffusion. Do you agree with his conclusion? Why or why not? Dissagree. The molecule is moving from low to high is being used
How can you explain the observed relationship between salt concentration and rate of contractile vacoule concentraction? Contractive vacuole remove excess water from the cell
If something happened to a paramecium that caused its contractile vacuole to stop contracting what would you expect to happen? Would this result occur more quickly if the paramecium was in water with a high salt concentration? Why? The puramecium would burst. This would ocur in low salt concentration. Because the water concentration is higher on the outside of the cell, so the water will go from high(outside) to low(inside)
Why is it dangerous for humans to drink sea water? Increase salt concentration in the blood stream. This causes the concentration on gradient to be higher in the cell. Thus the cell will lose water and dehydration
Which of the following does NOT require energy A.Diffusion C.Active Transport B.Endocytosis D.Sodium-potassium pump A.Diffusion
The sodium-potassium pump usually pumps A.potassium ions out of the cell B.sodium ions into the cell C.potassium ions into the cell D.only potassium ions and sugar molecules C.potassium ions into the cell
Ion channels gates close the pores of some ion channels in response to... A.streching of the cell membrane B.A change in electrical charge C.the binding of specific molecules to the channel D.all of the above D.all of the above
Ridding the cell of materials by discharging the materials in vesicles is called... A.osmosis C.exocytosis B.diffusion D.endocytosis C. exocytosis
Sugar molecules can enter cells through the process of... A.exocytosis C.osmosis B.facilitated diffusion D.ion pumps B.facilitated diffusion
Proteins and polysaccharides that are too large to move into a cell through diffusion or active transport move in by... A.exocytosis C.the sodium-potassium pump B.endocytosis D.none of the above B.endocytosis
Unlike passive transport, active transport... A.requires energy B.moves substances down their concentration gradient C.does not involve carrier proteins D.all of the above A.requires energy
Transport proteins that allow ions to pass through the cell membrane are called... A.receptor proteins C.ions channels B.marker proteins D.none of the above C.ion channels
Sugar molecules cross the cell membrane by... transport C,osmosis B.facilitated diffusion D. gated channels B.facilitated diffusion
Which of the following transmit information into a cell by binding to signal molecules? proteins C.marker proteins B.receptor proteins D.end proteins B.receptor proteins
When a signal molecule binds to a receptor protein, the receptor protein may... A.change the permeability of the membrane B.cause the formation of the a second messenger molecule C.catalyze certain chemical reactions in the cell D.all of the above D.all of the above
A cell will swell when it is placed in a(n) A.hypotonic solution C.isotonic solution B. hypertonic solution D.none of the above A.hypotonic solution
The sodium-potassium pump A.increases the concentration of sodium ion inside a cell B.decreases the concentration of potassium ions inside a cell C.increases the concentration of potassium ions inside a cell D.both (B) and (C) D.both (B) and (C)
The interior portion of a cell membrane forms a nonpolar zone that A.allows polar molecules to pass through the membrane B.allows food to pass through the membrane C.prevents ions and most large molecules from passing through the membrane D.none of th C.prevents ions and most large molecules from passing through the membrane
Proteins that act like selective passage ways in the cell membrane are known as... A.marker proteins C.receptor proteins proteins D.none of the above proteins
Both active transport and facilitated diffusion involve... A.ATP B.movement against a concentration gradient C.carrier proteins D.all of the above C.carrier proteins
Signal molecules bind to... A.carbohydrates C.receptor proteins B.marker proteins D.transport proteins C.receptor proteins
Osmosis is a type of... transport C.facilitated diffusion B.passive transport D.endocytosis B.passive transport
As a result of diffusion, the concentration of many types of substances... A.always remains greater inside a membrane B.eventually becomes balanced on both sides of a membrane C.always remains greater outside of a membrane D.becomes imbalanced on bo B.eventually becomes balanced on both sides of a membrane
Which part of the following is a form of active transport? A.osmosis C.facilitated diffusion B.diffusion D.sodium-potassium pump D.sodium-potassium pump
What happens when the structure labeled A binds to the structure labeled B? A.information is sent into the cell B.proteins enter the cell C.the cell begins to undergo mitosis D.none of the above A.information is sent into the cell
IONS move through ion channels by... A.endocytosis C.passive transport B.diffusion transport C.passive transport
The diffusion of water into or out of a cell is called... A.solubility C.selective transport B.osmosis D.endocytosis B.osmosis
Created by: Jaden_J_Weems
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