Chapter 7

Last update by Babara on 09/08/2014
949736 People have viewed this Quiz
  • Share

Water passes quickly through cell membranes because

A) the bilayer is hydrophilic.

B) it moves through hydrophobic channels.

C) water movement is tied to ATP hydrolysis.

D) it is a small, polar, charged molecule.

E) it moves through aquaporins in the membrane.



Answer:

E) it moves through aquaporins in the membrane.



View Chapter 7 as Flashcard Deck

Related Quiz Content
  • feldman2009
    Answered in Chapter 7

    Which of the following statements is correct about diffusion?

    A) It is very rapid over long distances.

    B) It requires an expenditure of energy bythe cell.

    C) It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

    D) It is an active process in which molecules move from a region of lower concentration to one of higher concentration.

    E) It requires integral proteins in the cell membrane.

    C) It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
  • feldman2009
    Answered in Chapter 7

    Cystic fibrosis is a genetic disease in humans in which chloride ion channels in cell membranes are missing or nonfunctional. 

    Chloride ion channels are membrane structures that include which of the following? 

    A) gap junctions 

    B) aquaporins 

    C) hydrophilic proteins 

    D) carbohydrates 

    E) sodium ions 



    C) hydrophilic proteins 



  • feldman2009
    Answered in Chapter 7

    Which of the following would you expect to be a problem for someone with nonfunctional chloride channeling? 

    A) inadequate secretion of mucus 

    B) buildup of excessive secretions in organs such as lungs 

    C) buildup of excessive secretions in glands such as the pancreas 

    D) sweat that includes no NaCl 

    E) mental retardation due to low salt levels in brain tissue 



    B) buildup of excessive secretions in organs such as lungs 



  • feldman2009
    Answered in Chapter 7

     If a young male child has cystic fibrosis, which of the following would affect his fertility? 

    A) inability to make sperm 

    B) incomplete maturation of the testes 

    C) failure to form genital structures appropriately

    D) incorrect concentrations of ions in semen 

    E) abnormal pH in seminal fluid 

    D) incorrect concentrations of ions in semen 



  • feldman2009
    Answered in Chapter 7

    A patient has had a serious accident andlost 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? 

    A) It will have no unfavorable effect as long as the water is free of viruses and bacteria. 

    B) The patient's red blood cells will shrivel up because the blood fluid is hypotonic compared to the cells. 

    C) The patient's red blood cells will swell because the blood fluid is hypotonic comparedto the cells. 

    D) The patient's red blood cells will shrivel up because the blood fluid is hypertonic compared to the cells. 

    E) The patient's red blood cells will burst because the blood fluid is hypertonic compared to the cells. 

    C) The patient's red blood cells will swell because the blood fluid is hypotonic comparedto the cells. 



  • feldman2009
    Answered in Chapter 7

    Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are

    A) hypotonic to both fresh water and the salt solution.

    B) hypertonic to both fresh water and the salt solution.

    C) hypertonic to fresh water but hypotonic to the salt solution.

    D) hypotonic to fresh water but hypertonic to the salt solution.

    E) isotonic with fresh water but hypotonic to the salt solution.


    C) hypertonic to fresh water but hypotonic (lesser concentration) to the salt solution.


  • feldman2009
    Answered in Chapter 7

    A cell whose cytoplasm has a concentration of 0.02 molar glucose is placed in a test tube of water containing 0.02 molar glucose. Assuming that glucose is not actively transported into the cell, which of the following terms describes the tonicity of the external solution relative to the cytoplasm of the cell? 

    A) turgid 

    B) hypertonic 

    C) hypotonic 

    D) flaccid 

    E) isotonic 



    E) isotonic 



  • feldman2009
    Answered in Chapter 7

    Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? 

    A) Theanimal cell is in a hypotonic solution, and the plant cell is in an isotonic solution. 

    B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution. 

    C) The animal cell is in a hypertonic solution, and the plant cell is inan isotonic solution. 

    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution. 

    E) The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution.

    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution. 



  • feldman2009
    Answered in Chapter 7

    You are working on a team that is designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the moleculeenters the cell? 

    A) blood or tissue type of the patient 

    B) non-polarity of the drug molecule 

    C) lack of charge on the drug molecule 

    D) similarity of the drug molecule to other molecules transported by the target cells 

    E) lipid composition of the target cells' plasma membrane 



    D) similarity of the drug molecule to other molecules transported by the target cells 



  • feldman2009
    Answered in Chapter 7

    In which of the following would there be the greatest need for osmoregulation? 

    A) an animal connective tissue cell bathed in isotonic body fluid 

    B) a terrestrial animal such as a snake 

    C) a red blood cell surrounded by plasma 

    D) a lymphocyte before it has been taken back into lymph fluid 

    E) a plant being grown hydroponically (in a watery mixture of designated nutrients) 

    B) a terrestrial animal such as a snake