TK 5-Biology

Which type(s) of molecules can be found in the phospholipid bilayer? a. Proteins b. Carbohydrates c. Lipids d. A and C e. A, B, and C

A, B, C

Select all factors that can influence diffusion rate. A. Molecule Size B. Types of element in the molecule C. Difference in concentration gradient. D. The number of valence electrons.

A. Molecule Size C. Difference in concentration gradient

Which of the following is not a function of membrane protein? -Act as enzyme -Act as signal molecules. -Facilitate transport of selective molecules across the membrane. -Act as surface receptor. -Function as cell identification marker

Act as signal molecules

Which type(s) of molecules can be found in the phospholipid bilayer? a. Proteins b. Carbs c. Lipids d. All of the above

All of the above

Primary and secondary active transport both.... a. include the passive movement of glucose molecules. b. can move solutes against the concentration gradient. c. use ATP directly. d. generate ATP. e. are based on passive movement of Na+ ions.

Can move solutes against concentration gradient

Which molecule passes through a lipid bilayer most readily? Isoleucine (amino acid) K+ Carbon dioxide RNA Glucose

Carbon Dioxide

Which of the following statements about passive transport is not true? a. Isotonic occurs when water concentration is the same across the membrane. b. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. c. Facilitated diffusion is a type of active transport. d. Osmosis is diffusion of water across the membrane. e. Carrier proteins carry specific molecules across the membrane from an area of higher concentration to an area of lower concentration.

Facilitated diffusion is a type of active transport.

Determine the type of transport occurs to these molecules. Each molecule is matched to one transport system. ------------------------A. Osmosis Glucose--------------B. Exocytosis Oxygen--------------C. Facilitated Diffusion by Transporter Na+-------------------D. Phagocytosis Secretory Proteins---E. Active Transport ------------------------F. Simple Diffusion

Glucose --- C. Facilitated Diffusion by Transporter Oxygen --- F. Simple Diffusion Na+ (Sodium ion) --- E. Active Transport Secretory Proteins --- B. Exocytosis

Vegetables in the refrigerator without covering turn soft quickly. This is because the air in the refrigerator is ______________ to the vegetables. -osmosis -isotonic -hypotonic -equilibrium -hypertonic

Hypertonic

Match molecules with the transport systems. -----------------A. Osmosis Ions -------------B. Secondary active transport Glucose --------C. Endocytosis Cellular Waste--D. Exocytosis ------------------E. Primary active transport

Ions --- E. Primary active transport Glucose --- B. Secondary active transport Cellular wastes --- D. Exocytosis

Cell membrane must be made of 2 layers of lipids because... a. lipid molecules must protect their hydrophobic tails. b. lipid molecules can only exist in even numbers. c. lipid molecules are hydrophobic in nature. d. cell membrane is hydrophilic in nature. e. cell membrane is selective permeable to substances.

Lipid molecules must protect their hydrophobic tails.

To reduce salt concentration in a solution,... a. more H2O can be added. b. more H2O can be evaporated. c. more salt can be added. d. more solutes can be added.

More H2O can be added

Which statement is not true about the integral membrane proteins? a. Proteins that are secreted by one cell to communicate with other cells. b. Proteins involved in the transport of other molecules across the membrane. c. Proteins with hydrophobic and hydrophilic regions. d. Proteins found on the surface of the plasma membrane. e. They are all true statements about the integral membrane proteins.

Proteins that are secreted by one cell to communicate with other cells.

You are studying how the protein transferrin enters cells. When you examine cells that have taken up transferrin, you find it inside clathrin-coated vesicles. Therefore, the most likely mechanism for uptake of transferrin is a. facilitated diffusion. b. gap junctions. c. ion channels. d. an antiport. e. receptor-mediated endocytosis.

Receptor-mediated endocytosis

Which of the following statement about endocytosis is not true? a. Pinocytosis is when the cell membrane brings in drops of extracellular liquid. b. Receptor-mediated endocytosis is when the cell membrane brings in a mixture of molecules from the extracellular space. c. Endocytosis is a very energy intensive process. d. Endocytosis is when the cell takes substances into the cell. e. Phagocytosis is when the cell membrane brings solid from the extracellular space.

Receptor-mediated endocytosis is when the cell membrane brings in a mixture of molecules from the extracellular space.

Facilitated diffusion and active transport both... a. depend on the solubility of the solute in lipids. b. increase without limit as the concentration gradient increases. c. require ATP. d. carry solutes in only one direction. e. require the use of proteins as carriers.

Require the use of proteins as carriers

Which of the following statement about sodium-potassium pump is true? a. Sodium-potassium pump is an example of passive transport. b. Number of sodium ions and potassium ions transported across the membrane are the same. c. Sodium-potassium pump is what creates the electrical charge difference across the membrane. This allows nerve cells to conduct electricity. d. Sodium-potassium pump is an example of symport. e. Sodium-potassium pump work by kinetic energy.

Sodium-potassium pump is what creates the electrical charge difference across the membrane. This allows nerve cells to conduct electricity.

Starch in the starch water is called a. buffer. b. solvent. c. solution. d. solute.

Solute

A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose, readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane? A. The artificial membrane lacked a protein needed for glucose transport. B. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. C. Oxygen readily passes through the membrane, so glucose should have as well. D. The membrane lacked an adequate amount of amphipathic molecules for glucose transport.

The artificial membrane lacked a protein needed for glucose transport.

Which statement about membrane proteins is not true? a. Some serve as channels for ions to cross the membrane. b. Many are free to migrate laterally within the membrane. c. Their position in the membrane is determined by their tertiary structure. d. They all extend from one side of the membrane to the other. e. Some play roles in photosynthesi

They all extend from one side of the membrane to the other

The function of eukaryotes membranes include... -barriers separating extracellular and intracellular environments. -cell-to-cell adhesion. -ATP synthesis. -unselective transportation

-barriers separating extracellular and intracellular environments. -ATP synthesis.