1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
posledela
3 years ago
11

A) Compare and contrast diffusion, passive transport (diffusion & facilitated), primary active transport and secondary activ

e transport. Be sure that your answer clearly differentiates between each mechanism and includes specific examples of the way in which specific molecules are transported across the cell membrane by each mechanism. B
Biology
1 answer:
zheka24 [161]3 years ago
7 0

Answer:

<u>Passive transport</u>: It does not need any energy to occur. Happens in favor of an electrochemical gradient. Simple diffusion and facilitated diffusion are kinds of passive transport.

<u>Simple diffusion</u>: molecules freely moves through the membrane.

<u>Facilitated diffusion</u>: molecules are carried through the membrane by channel proteins or carrier proteins.

<u>Active transport</u> needs energy, which can be taken from the ATP molecule (<u>Primary active transport</u>) or from a membrane electrical potential (<u>Secondary active transport</u>).

Explanation:

  • <u>Diffusion</u>: This is a pathway for some <em>small polar hydrophilic molecules</em> that can<em> freely move through the membrane</em>. Membrane´s permeability <em>depends</em> on the <em>size of the molecule</em>, the bigger the molecule is, the less capacity to cross the membrane it has. Diffusion is a very slow process and to be efficient requires short distances and <em>pronounced concentration gradients</em>. An example of diffusion is <em>osmosis</em> where water is the transported molecule.
  • <u>Facilitated diffusion</u>: Refers to the transport of <em>hydrophilic molecules</em> that <em>are not able to freely cross the membrane</em>. <em>Channel protein</em> and many <em>carrier proteins</em> are in charge of this <em>passive transport</em>. If uncharged molecules need to be carried this process depends on <em>concentration gradients</em> and molecules are transported from a higher concentration side to a lower concentration side. If ions need to be transported this process depends on an <em>electrochemical gradient</em>. The <em>glucose</em> is an example of a hydrophilic protein that gets into the cell by facilitated diffusion.

<em>Simple diffusion</em> and <em>facilitated diffusion</em> are <u>passive transport</u> processes because the cell <u><em>does not need any energy</em></u> to make it happen.

  • <u>Active transport</u> occurs <em>against the electrochemical gradient</em>, so <u><em>it does need energy to happen</em></u>. Molecules go from a high concentration side to a lower concentration side. This process is always in charge of <em>carrier proteins</em>. In <u>primary active transport</u> the <em>energy</em> needed <em>comes from</em> the <em>ATP</em> molecule. An example of primary active transport is the <em>Na-K bomb</em>. In <u>secondary active transport</u>, the<em> energy comes from</em> the <em>membrane electric potential</em>.  Examples of secondary active transport are the carriage of <em>Na, K, Mg metallic ions</em>.
You might be interested in
Earth is composed of layers of material with different properties. Which
Irina-Kira [14]

Answer:

mantle

Explanation:

A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density. All terrestrial planets (including Earth), a number of asteroids, and some planetary moons have mantles.

4 0
3 years ago
Put the following stages in order: G2,G1, S, mitosis, cytokinesis.
Oliga [24]
G1, S, G2, Mitosis, Cytokinesis

Just did this yesterday lol hope it helps


3 0
3 years ago
Read 2 more answers
What causes fractures in the litosphere? Select one: a. Physical stress b. Exogenic processes c. Endogenic processes d. Tensiona
ollegr [7]

i think its physical stress

4 0
2 years ago
Read 2 more answers
What is the difference between a food chain and food web
fomenos
A food chain follows one path of energy and materials between species. A food web is more complex and is a whole system of connected food chains. In a food web, organisms are placed into different trophic levels. ... Producers are the basic trophic level while top predators are the peak level.
5 0
3 years ago
Read 2 more answers
Many molecules are moved through the body by
Solnce55 [7]

Question: Many molecules are moved through the body by?

Answer:<u> The molecules are moved through the body by uses special transport proteins to move molecules across the membrane that cannot pass thorough on their own. Usually large molecules. Carrier proteins blind and carry the molecules across the cell membrane. They provide an open channel of passageway through the cell membrane for molecules to move across.</u>

<em>Hope this helps!.</em>

<em>~~~~~~~~~~~~~~~~</em>

<em>~A.W~ZoomZoom44</em>

6 0
3 years ago
Other questions:
  • Inhaling carbon monoxide reduces the ability of red blood cells to carry oxygen. This can lead to brain damage. Which three syst
    8·2 answers
  • "what are the two sources of energy that power the earth system?"
    14·1 answer
  • Select all of the following which are examples of physical change.
    13·2 answers
  • During the 1950s, California citrus growers were trying to combat an infestation of the citrus red mite using different insectic
    9·1 answer
  • What process do plants use to incorporate the sun's energy into an organic molecule?
    11·1 answer
  • How do humans change the composition of the Earth’s Atmosphere? (CITE 3 EXAMPLES)
    6·2 answers
  • Determine what foods you would take with you on your journey develop a supply list must by 2 paragraphs.
    12·1 answer
  • 2.Cellular ____________________ is the process in which cells use oxygen to release energy from food (glucose)
    13·2 answers
  • Describe the experiment, to show that light intensity, water, chlorophyll, and cabondioxide are needed for photosynthesis
    7·1 answer
  • I need your guys's help!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!