bio3.txt

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Author:
itzlinds
ID:
123105
Filename:
bio3.txt
Updated:
2011-12-12 22:23:04
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cell biology
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cell biology
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  1. Osmotic pressure is:


    the ability of a solution to affect the fluid volume and pressure in a cell.
    the pressure required to open aquaporins (water channels) on the plasma membrane.
    the pressure exerted on a membrane by water.
    equal to the pressure needed to stop the movement of water from one side of a membrane to the other.
    equal to the pressure needed to stop the movement of water from one side of a membrane to the other
  2. An increase in the permeability of the plasma membrane to a certain type of moleculewould _________ the rate of diffusion of those molecules through the plasma membrane. increase decrease not change
    increase
  3. An increase in the surface area of the cell would _________ the rate of diffusion of molecules through the plasma membrane. increase decrease not change
    increase
  4. An increase in the "steepness" of the concentration gradient would _________ the rate of diffusion of those molecules through the plasma membrane. increase decrease not change
    increase
  5. An increase in molecule size would _________ the rate of diffusion of molecules through the plasma membrane. increase decrease not change
    decrease
  6. An increase in temperature would _________ the rate of diffusion of molecules through the plasma membrane. increase decrease not change
    decrease
  7. The plasma membrane is made primarily of ________ molecules, but ________ make up about 50% of the membrane weight.

    protein; lipids
    lipid; proteins
    protein; monosaccharides
    cholesterol; proteins
    lipids; proteins
  8. There is a limit to how large a cell can be, why is bigger not necessarily better?

    As cell size increases, the surface area doesn't increase as much as the volume inside the cell, making it more difficult for the cell to exchange nutrients and wastes with the extracellular fluid.
    Larger cells would limit the space available for extracellular fluid, which means fewer nutrients would be available to the cells.
    Larger cells need more organelles to support themselves and this would use too much energy.
    As cell size increases, the surface area increases more than the volume inside the cell, leaving less room for organelles to carry out the functions of the cell.
    as cell size increases, the surface area does increase as much as the volume inside the cell, making it more difficult for the cell to exchange nutrients and wastes with extracelluar fluid
  9. A 0.9% solution of NaCl is isotonic to red blood cells. What happens if red blood cells are placed in 1.5% NaCl? Why?



    The cells swell and burst (hemolysis occurs). This happens because the concentration of solutes is higher inside the cell, causing water to flow into the cell.
    The cells swell and burst (hemolysis occurs). This happens because the concentration of solutes is lower inside the cell, causing water to flow into the cell.
    The cells shrivel (crenation occurs). This happens because the concentration of solutes is higher outside the cell, causing water to flow out of the cell.
    The cells shrivel (crenation occurs). This happens because the concentration of solutes is lower outside the cell, causing water to flow out of the cell.
    The cells shrivel (crenation occurs). this happens because the concetntration of solutes is higher oustide the cell, causing the water to flow out of the cell
  10. What is the difference between facilitated diffusion and active transport?
    Facilitated diffusion moves substances "up" or against a concentration gradient whereas active transport moves substances "down" or with a concentration gradient.
    Facilitated diffusion can only be used for small molecules, larger molecules must use active transport.
    Active transport uses energy for transport and facilitated diffusion does not.
    Active transport uses carrier proteins and facilitated diffusion does not.
    active transport uses energy for transport and facilitated diffusion does not
  11. Which organelle has functions that include synthesis of proteins and lipids and detoxification of alcohol and other drugs?

    nucleus
    endoplasmic reticulum
    centriole
    lysosome
    Golgi complex
    endoplasmic reticulum
  12. Which organelle is made of microtubules and plays an important role in cell division?

    peroxisome
    centriole
    mitochondria
    nucleus
    endoplasmic reticulum
    centriole
  13. what are the fxn of the plasma membrane:
    • cell boundries
    • gate keeper
    • allows things in and out
    • recognition
    • protection
    • transport
    • signal transmission
    • semipermable
  14. In an isotonic solution what will happen to a cell? hypertonic? hypotonic?
    • isotonic: neutral
    • hypertonic: crenation (shrink)
    • hypotonic: lysis (bust)
  15. Give two example of active transport:
    • excoytosis
    • endocytosis
    • phagocytosis
    • pheinocytosis
  16. which of the following is not a type of active transport?

    A. movement of a molecule up the concentration gradient
    B. endocytosis
    C. facilitated diffusion
    D. exocytosis
    C. facilitaed diffusion
    (this multiple choice question has been scrambled)
  17. _________ referst to 'cellular eating'

    A. exocytosis
    B. hydrolysis
    C. phagocytosis
    D. pinocytosis
    C. phagocytosis
    (this multiple choice question has been scrambled)
  18. what will happen to a cell when it is submerged in a hypertonic solution?

    A. clotting
    B. stays normal
    C. crenation
    D. lysis
    C. crenation
    (this multiple choice question has been scrambled)

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