1 Which of the following is NOT a characteristic of an animal plasma membrane?

Transcription

1 1 Which of the following is NOT a characteristic of an animal plasma membrane? A) separates the internal environment of the cell from the external environment B) helps the cell maintain homeostasis C) responsible for the synthesis of ATP D) helps to maintain the cell's shape E) regulates passage of molecules into and out of the cell 2 If a particular protein was identified in the plasma membrane to cause organ transplant rejection, such a protein would be considered a(an) protein. A) carrier B) channel C) cell-recognition D) receptor E) enzymatic 3 A protein combines with a substance and helps to move it across the membrane. A) carrier B) channel C) cell-recognition D) receptor E) enzymatic 4 is the net movement of molecules from a region of higher concentration to a region of lower concentration. A) Osmosis B) Diffusion C) Facilitated diffusion D) Active transport

2 E) Pinocytosis 5 The diffusion of water across a differentially permeable membrane is called. A) simple diffusion B) facilitated diffusion C) osmosis D) exocytosis E) endocytosis 6 Suppose a thistle tube containing a 10% sugar solution is covered at one end by a differentially permeable membrane and is placed in a beaker containing a 5% sugar solution. What will happen to the water? A) Water will only enter the thistle tube. B) Water will only leave the thistle tube. C) There will be no net water movement. D) More water will enter the thistle tube than leave the thistle tube. E) More water will leave the thistle tube than enter the thistle tube. 8 Which type of solution will have the same solute concentration on both sides of the cell membrane? A) isotonic B) hypertonic C) hypotonic D) hygrotonic solution 9 Which organelle in a plant cell fills with water as turgor pressure develops? A) nucleus B) endoplasmic reticulum C) Golgi apparatus

3 D) lysosome E) central vacuole 10 Which term best describes the condition of red blood cells when placed in a hypotonic solution? A) hemolysis B) plasmolysis C) crenation D) turgor pressure E) osmotic pressure 11 Which of the following conditions does NOT apply to facilitated transport? A) requires specific carrier proteins B) transports molecules down the concentration gradient C) requires the expenditure of energy D) transports molecules from one side of the membrane to the other side E) transports molecules through the membrane much faster than simple diffusion 12 Upon observation of an electron micrograph, a scientist noted a large number of mitochondria near a plasma membrane within a particular cell. The scientist would probably hypothesize that the cell used energy for purposes. A) diffusion B) osmosis C) facilitated diffusion D) active transport E) phagocytosis 13 Which process will transport sodium ions to the outside of the cell and potassium ions to the inside of the cell? A) simple diffusion

4 B) facilitated diffusion C) osmosis D) active transport E) pinocytosis 14 Pinocytotic vesicles or phagocytotic vesicles often fuse with a inside the cell for digestion. A) mitochondrion B) lysosome C) Golgi apparatus D) rough endoplasmic reticulum E) smooth endoplasmic reticulum 15 Large amoeboid-type cells, called macrophages, remove viruses and worn-out red blood cells by a process called. A) facilitated diffusion B) osmosis C) exocytosis D) phagocytosis E) pinocytosis 16 The process that requires a vesicle to fuse with the membrane, thereupon discharging its contents, is called. A) exocytosis B) endocytosis C) pinocytosis D) plasmolysis E) crenation

5 17 Because certain substances can move across the membrane while others cannot, the plasma membrane is considered. A) impermeable B) permeable C) differentially permeable D) selectively impermeable 18 Which of the following does NOT influence the rate of diffusion? A) temperature B) pressure C) electrical current D) ph level E) molecular size