Ch.7 Bio

Which of the following cell structures exhibits selective permeability between a cell and its external environment?

Which of the following statements about the role of phospholipids in the structure and function of biological membranes is correct?

The plasma membrane is referred to as a "fluid mosaic" structure. Which of the following statements about that model is true?

Consider the currently accepted fluid mosaic model of the plasma membrane. Where in the plasma membrane would cholesterol most likely be found?

Which of the following is NOT a function of membrane proteins?

Which of the following functions of membrane proteins is important in tissue formation during embryonic development in animals?

Which of the following statements concerning carbohydrates associated with the plasma membrane is correct?

Consider the currently accepted fluid mosaic model of the plasma membrane. Where in the membrane would carbohydrates most likely be found?

Which of the following molecules is most likely to passively diffuse across the plasma membrane?

Which of the following would be LEAST likely to diffuse through a plasma membrane without the help of a transport protein?

Which of the following statements about passive transport is correct?

Cells A and B are the same size, shape, and temperature, but cell A is metabolically less active than cell B. and cell B is actively converting oxygen to water in cellular respiration. Oxygen will diffuse more rapidly into cell __________ because __________.

What is diffusion?

Is diffusion an active or passive transport?

A single plant cell is placed in an isotonic solution. Salt is then added to the solution. Which of the following would occur as a result of the salt addition?

Seawater is hypertonic to cytoplasm in vertebrate cells and in plant cells. If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?

Which of these statements describes some aspect of facilitated diffusion?

What kind of passageways does facilitated diffusion have?

Which of the following is FALSE in regard to facilitated diffusion?

A selectively permeable membrane separates two solutions. Water is able to pass through this membrane; however, sucrose (a disaccharide) and glucose (a monosaccharide) cannot pass. The membrane separates a 0.2-molar sucrose solution from a 0.2-molar glucose solution. With time, how will the solutions change?

The concentration of solutes in a red blood cell is about 2%, but red blood cells contain almost no sucrose or urea. Sucrose cannot pass through the membrane, but water and urea can. Osmosis would cause red blood cells to shrink the most when immersed in which of the following solutions?

Green olives may be preserved in brine, which is a 30% salt solution. How does this method of preservation prevent microorganisms from growing in the olives?

Active transport requires an input of energy and can also generate voltages across membranes. Based on this information, which of the following statements is true?

Glucose can be moved into cells via an active transport mechanism when the concentration of glucose inside the cell is higher than the concentration of glucose outside of the cell. This active transport mechanism moves glucose and sodium into the cell at the same time. The glucose moves up its gradient and the sodium moves down its gradient. Which of the following statements about this mechanism is accurate?

Which of the following is a correct difference between active transport and facilitated diffusion?

Which of the following statements about the sodium-potassium pump is correct?

A cell has a membrane potential of –100 mV (more negative inside than outside) and has 1,000 times more calcium ions outside the cell than inside. Which of the following best describes a mechanism by which Ca2+ enters the cell?

Which of the following correctly describes a general property of all electrogenic pumps?

Which of the following statements about cotransport of solutes across a membrane is correct?

Consider the transport of protons and sucrose into a plant cell by the sucrose-proton cotransport protein. Plant cells continuously produce a proton gradient by using the energy of ATP hydrolysis to pump protons out of the cell. Why, in the absence of sucrose, do protons not move back into the cell through the sucrose-proton cotransport protein?

Which of the following enables a cell to pick up and concentrate a specific kind of molecule?

Which of the following processes and organelles account for the replacement of lipids and proteins lost from the plasma membrane?

A nursing infant is able to obtain disease-fighting antibodies, which are large protein molecules, from its mother's milk. These molecules probably enter the cells lining the baby's digestive tract via which process?

What is Endocytosis?

Which of the following pairs correctly matches a membrane transport process to its primary function?

Cell membranes are asymmetrical. Which of the following is the most likely explanation?

The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.

A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water–equal to the volume of blood lost–is transferred directly into one of his veins. What will be the most probable result of this transfusion?

Several epidemic microbial diseases of earlier centuries incurred high death rates because they resulted in severe dehydration due to vomiting and diarrhea. Today they are usually not fatal because we have developed which of the following

Water passes quickly through cell membranes because...

The difference between pinocytosis and receptor-mediated endocytosis is that...

In order for a protein to be an integral membrane protein it would have to be...

The sodium-potassium pump is called an electrogenic pump because it...

The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.

Initially, in terms of tonicity, the solution in side A with respect to that in side B is