Tag: biology

Questions Related to biology

Active transport across biomembrane involves

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Production of ATP

  2. Requirement of energy

  3. Production of toxin

  4. Release of energy

Show answer
Correct Option: B
Explanation:
  • Active transport is a process by which molecules move across the cell membrane from a region of low concentration to a region of high concentration against the concentration gradient using energy.
  • This energy requirement is fulfilled by the ATP molecules (metabolic energy).
  • The substances which are transported across the cell membrane by active transport are- Na+, K+, Mg2+, and Ca2+.
  • So, the correct answer is 'Requirement of energy'.

Minerals are absorbed by the plants, through

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Pressure flow

  2. Diffusion

  3. Active transport

  4. Osmosis

Show answer
Correct Option: C
Explanation:

Minerals are absorbed by plants through active transport as minerals are present in the soil mostly in the form of charged particles which fail to move across cell membrane and concentration of minerals in the cell is usually greater than that present in the soil solution. Therefore, most of the minerals are absorbed by active mechanism involving expenditure of energy in the form of ATP.

Hence, C is the correct answer.

$Na^+ / K^+$ pump in a cell is an example of

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Osmosis

  2. Diffusion

  3. Passive transport

  4. Active transport.

Show answer
Correct Option: D

Active transport of ions by a cell requires

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. High temperature

  2. Low temperature

  3. Alkaline pH

  4. ATP

Show answer
Correct Option: D
Explanation:
  • Active transport can be defined as the movement of molecules and ions across a cell membrane from a region of lower concentration (of the molecules) to the region of higher concentration i.e, movement of molecules occurs against the concentration gradient. 
  • This transport requires cellular or metabolic energy which is available in the form of ATP molecules produced within the cell.
  • So, the correct answer is 'ATP'.

Which is not true of active transport

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. It is chemical process

  2. Energy is obtained from ATP

  3. Occurs through carrier molecules

  4. Not modified by enzymes.

Show answer
Correct Option: A

Active transport is characterised by

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Requires special membrane proteins

  2. Highly selective

  3. Requires ATP energy

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • Active transport can be defined as the movement of molecules or ions across a plasma membrane from a region of lower concentration (of molecules or ions) to a region of higher concentration, against the concentration gradient. 
  • For this cellular energy is required which is available in the form of ATP molecule and enzymes.
  • So, the correct answer is 'All of the above'.

It is not characteristic of active transport

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Highly selective

  2. Insensitive to inhibitors

  3. Uphill transport

  4. Transporter saturates.

Show answer
Correct Option: B

The energy is required in absorption of water by

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Active absorption

  2. Passive absorption

  3. Both passive and active absorption

  4. None of the above

Show answer
Correct Option: A
Explanation:

Absorption of water takes place by both active and passive absorption.
Water, as per some theory, is absorbed against the concentration gradient. This type of absorption is termed active absorption where the movement is against the concentration gradient and requires energy in the form of ATP.

Most of the plants observe passive absorption, meaning, the movement is without utilization of metabolic energy. 
Thus, the correct answer is option (C). 

Glucose and amino acids are absorbed in intestine by

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Osmosis

  2. Passive transport

  3. Active transport

  4. Selective absorption

Show answer
Correct Option: C
Explanation:

The monosaccharides glucose and galactose are transported into the epithelial cells by common protein carriers via secondary active transport I.e  by co-transport with sodium ions. The monosaccharides leave these cells via facilitated diffusion and enter the capillaries through intercellular clefts.

Thus C is the correct option. 

Movement of materials against concentration gradient is achieved by

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Active trasnport

  2. Passive transport

  3. Diffusion

  4. Osmosis

Show answer
Correct Option: A
Explanation:

  • Active transport is the transport where the direct expenditure of energy takes place and the molecules move against the gradient which is from lower concentration to the higher concentration.
  • Passive absorption is the absorption which takes place without expenditure of energy. The water molecules move from higher concentration to the lower concentration which is towards the gradient. 
  • In diffusion, the ions or molecules randomly diffuses the semipermeable membrane along the concentration gradient.
  • Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. 
So, the correct answer is option A.