Home
Class 11
BIOLOGY
Active transport :...

Active transport :

A

requires an input of ATP

B

is involved in diffusion

C

occurs in osmosis and facilitated transport

D

all of the above

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution for Active Transport 1. **Definition of Active Transport**: Active transport is a biological process that moves ions or molecules across a cell membrane from a region of lower concentration to a region of higher concentration. This process is essential for maintaining cellular homeostasis and requires energy. **Hint**: Remember that active transport is different from passive transport, which does not require energy. 2. **Energy Requirement**: Active transport requires an input of energy, typically in the form of adenosine triphosphate (ATP). This energy is necessary because the movement occurs against the concentration gradient. **Hint**: Think of ATP as the "fuel" that powers the transport process. 3. **Mechanism of Active Transport**: In active transport, specific proteins in the cell membrane, known as transport proteins or pumps, facilitate the movement of substances. For example, the sodium-potassium pump actively transports sodium ions out of the cell and potassium ions into the cell. **Hint**: Visualize the transport proteins as gates that require energy to open and allow substances to pass through. 4. **Concentration Gradient**: Unlike diffusion, which moves substances from areas of high concentration to low concentration, active transport moves substances against this gradient. This means that substances are moved from areas where they are less concentrated to areas where they are more concentrated. **Hint**: Remember the phrase "against the flow" to understand how active transport works compared to diffusion. 5. **Example of Active Transport**: A common example of active transport is the movement of sodium ions (Na+) and potassium ions (K+) across the plasma membrane. The sodium-potassium pump uses ATP to transport sodium ions out of the cell and potassium ions into the cell, maintaining essential cellular functions. **Hint**: Consider how this process is crucial for nerve impulse transmission and muscle contraction. ### Summary Active transport is a vital cellular process that requires energy (ATP) to move substances against their concentration gradient. It involves specific transport proteins and is essential for various physiological functions.
### Step-by-Step Solution for Active Transport 1. **Definition of Active Transport**: Active transport is a biological process that moves ions or molecules across a cell membrane from a region of lower concentration to a region of higher concentration. This process is essential for maintaining cellular homeostasis and requires energy. **Hint**: Remember that active transport is different from passive transport, which does not require energy. 2. **Energy Requirement**: Active transport requires an input of energy, typically in the form of adenosine triphosphate (ATP). This energy is necessary because the movement occurs against the concentration gradient. ...
Promotional Banner

Topper's Solved these Questions

  • CELL : THE UNIT OF LIFE

    ICSE|Exercise Test Your Progress (Fill in the blanks with appropriate words)|29 Videos

  • CELL : THE UNIT OF LIFE

    ICSE|Exercise Test Your Progress (State whether the following statements are true or false )|45 Videos

  • CELL - THE UNIT OF LIFE

    ICSE|Exercise REVIEW QUESTIONS (LONG ANSWER TYPE QUESTIONS)|14 Videos

  • CELL CYCLE AND CELL DIVISION

    ICSE|Exercise REVIEW QUESTIONS ( LOOK AT THE FIGURE BELOW) |2 Videos

Similar Questions

Explore conceptually related problems

Given in the box below are a set of 14 biological terms. Of these, 12 can be paired into 6 matching pairs. Out of the six pairs, one has been done for you as an example. Example : Endosmosis - Turgid cell. Cushing's syndrome, Turgid cell, Iris, Free of rod and cone cells, Colour of eyes, Hypoglycemia, Active transport, Acrosome, Addison's disease, Blind spot, Hyperglycemia, Spermatozoa, Endosmosis, Clotting of blood.

Which factor influences activ transport of substances across the membrane ?

In root endodermis, layer of which substance provide ability to actively transport ions in one direction only.

transport proteins of endodermal cells are control point where a plant adjusts the quantity and types of solutes that reach the xylem. Root endodermis is able to actively transport ions in one direaction only becaouse of the layer of .

[A] : Molecules of fatty acid, glycerol, sugars and amino acids are absorbed by the huge number of villi that line the intestinal wall. [R]: Absorption involves active transport and requires an expenditure of cellular energy

At loading sugars are actively transported in the phloem

Name two actively transported substances in glomerular filtrate.

The carrier - mediated cotransport in which a solute is actively transported across a membrane against the gradient of electrochemical potential by coupling the uphill transport of one solute to the downhill transport of another in an example of

As various ions from the soil are actively transported into the vascular tissues of roots, then water follows (it's potential gradient) and increase the pressure inside the xylem. This positive pressure is called.

Find out A,B,C,D,E,F and G indicating either "yes" or "no" in the given table. {:("Property","Simple Diffusion","Facilitated Diffusion","Active Transport"),("(i) Highly selective","No","A","B"),("(ii) Transport saturates","C","D","Yes"),("(iii) Requires ATP ","E","F","G"):}