Jacob and Monad studied lactose metabolism in E.Coli and proposed operon concept. Operon concept applicable for
Jacob and Monad studied lactose metabolism in E.Coli and proposed operon concept. Operon concept applicable for
- All prokaryotes
- All prokaryotes and some eukaryotes
- All prokaryotes and all eukaryotes
- All prokaryotes and some protozoanes
The Correct Option is A
Solution and Explanation
The correct option is (A) : All prokaryotes
The Lac operon idea was developed by Jacob and Monad after their investigation of lactose metabolism in E. coli. The idea clarifies how lactose is transported and metabolised by Escherichia coli and many other intestinal bacteria. Every prokaryote can benefit from understanding the Lac-operon idea.
Top Questions on Cell: the unit of life
- What is the movement of cytoplasm within a cell called?
- MHT CET - 2024
- Biology
- Cell: the unit of life
- Given below are two statements: Statement I: Cell wall is freely permeable.
Statement II: Plasma membrane is selectively permeable.
Choose the correct answer from the options given below with reference to the structure of root hair:- MHT CET - 2024
- Biology
- Cell: the unit of life
How many different proteins does the ribosome consist of?
- NEET (UG) - 2023
- Biology
- Cell: the unit of life
Match List I with List II.
List I
List II
A CCK I Kidney B GIP II Heart C ANF III Gastric gland D ADH IV Pancreas List I List II A. CCK I. Kidney B. GIP II. Heart C. ANF III. Gastric gland D. ADH IV. Pancreas Choose the correct answer from the options given below:
- NEET (UG) - 2023
- Biology
- Cell: the unit of life
Which of the following statements are correct?
- Basophils are most abundant cells of the total WBCs
- Basophils secrete histamine, serotonin and heparin
- Basophils are involved in inflammatory response
- Basophils have kidney shaped nucleus
- Basophils are agranulocytes
Choose the correct answer from the options given below:
- NEET (UG) - 2023
- Biology
- Cell: the unit of life
Questions Asked in NEET exam
- In a uniform magnetic field of \(0.049 T\), a magnetic needle performs \(20\) complete oscillations in \(5\) seconds as shown. The moment of inertia of the needle is \(9.8 \times 10 kg m^2\). If the magnitude of magnetic moment of the needle is \(x \times 10^{-5} Am^2\); then the value of '\(x\)' is
- NEET (UG) - 2024
- Magnetic Field
- In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x (kcal m-2)yr-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
- NEET (UG) - 2024
- Ecosystems
- Spindle fibers attach to kinetochores of chromosomes during
- NEET (UG) - 2024
- cell cycle and cell division
- In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. 2NaHCO3(s) → Na2CO3(s)+CO2(g)+H2O(g)
D. Cl2(g) → 2Cl(g)
Choose the correct answer from the options given below:- NEET (UG) - 2024
- Entropy and free energy
- Match List I with List II:
List I List II A Two or more alternative forms of a gene I Back cross B Cross of F1 progeny with homozygous recessive parent II Ploidy C Cross of F progeny with any of the parents III Allele D Number of chromosome sets in plant IV Test cross
Choose the correct answer from the options given below:- NEET (UG) - 2024
- Regulation of Gene Expression
Concepts Used:
Cell Cycle and Cell Division
Cell Cycle:
The sequence of events by which a cell copies itself synthesizes other constituents of the cell and eventually splits into two daughter cells is termed the cell cycle. The cell synthesizes all its constituents in a sequential pattern to make sure the proper division and distribution of components that occurs between the two daughter cells. Therefore, we can say that the cell cycle is the period of time between the development of new daughter cells and their further division.
Stages of Cell Cycle:
The cell cycle can be sub-divided into an additional category of Interphase. Meanwhile, the Interphase can be branched into 3 further stages, such as:
- G1 Phase - “Gap 1 Phase”
- S Phase - "Synthesis Phase"
- G2 Phase - "Gap 2 Phase"
Read More: Cell Cycle and Cell Division
Cell Division:
The division of the parent cells into two or more cells is called daughter cell, cell division takes place. In general, it occurs as a part of a larger cell cycle. All the cell reproduces by dividing into two, wherein each parental cell produces two daughter cells.
Stages of Cell Division:
Cell division can be widely divided into several sub-segments that result from Mitosis and Meiosis.
- Mitosis or (M Phase)
- Meiosis