acob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept is applicable for (a) all prokaryotes (b) all prokaryotes and some eukaryotes (c) all prokaryotes and all eukaryotes (d) all prokaryotes and some protozoans

acob and Monod studied lactose metabolism in
E. coli and proposed operon concept. Operon concept
is applicable for
(a) all prokaryotes
(b) all prokaryotes and some eukaryotes
(c) all prokaryotes and all eukaryotes
(d) all prokaryotes and some protozoans
by

1 Answer

Answer :

(c) all prokaryotes and all eukaryotes
by

Related questions

Operon model of gene regulation and organisation of prokaryotes was proposed by: (a) Messelson and Stahl (b) Wilkins and Franklin (c) Beadle and Tatum (d) Jacob and Monod

Description : Operon model of gene regulation and organisation of prokaryotes was proposed by: (a) Messelson and Stahl (b) Wilkins and Franklin (c) Beadle and Tatum (d) Jacob and Monod

Last Answer : Ans. ((d))

Select the two correct statements out of the four (i – iv) statements given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it. (ii) In the absence of lactose, the repressor binds with the operator region. (iii)The z-gene codes for permease. (iv) This was elucidated by Francois Jacob and Jacques Monod. The correct statements are (a) (ii) and (iii) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (ii)

Description : Select the two correct statements out of the four (i - iv) statements given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it. (ii) In the absence of lactose, the repressor binds with the ... (iii) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (ii)

Last Answer : (c) (ii) and (iv)

.Gene regulation governing lactose operon of E.coli that involves the lac I gene product is (a) negative and repressible because repressor protein prevents transcription (b) feedback inhibition because excess of β-galactosidase can switch off transcription (c) positive and inducible because it can be induced by lactose (d) negative and inducible because repressor protein prevents transcription.

Description : .Gene regulation governing lactose operon of E.coli that involves the lac I gene product is (a) negative and repressible because repressor protein prevents transcription (b) feedback inhibition ... be induced by lactose (d) negative and inducible because repressor protein prevents transcription.

Last Answer : (d) negative and inducible because repressor protein prevents transcription.

Lac operon’ in E. coli, is induced by (a) ‘I’ gene (b) promoter gene (c) β-galactosidase (d) lactose.

Description : Lac operon’ in E. coli, is induced by (a) ‘I’ gene (b) promoter gene (c) β-galactosidase (d) lactose.

Last Answer : (c) β-galactosidase

The wild type E.coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes take place? (a) The lac operon is induced. (b) E.coli cells stop dividing. (c) The lac operon is repressed. (d) All operons are induced.

Description : The wild type E.coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes take place? (a) The lac operon is ... ) E.coli cells stop dividing. (c) The lac operon is repressed. (d) All operons are induced.

Last Answer : (a) The lac operon is induced

.E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because (a) the lac operon is constitutively active in these cells (b) they cannot synthesise functional beta galactosidase (c) in the presence of glucose, E.coli cells do not utilise lactose (d) they cannot transport lactose from the medium into the cell.

Description : .E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because (a) the lac operon is constitutively active in these cells ( ... coli cells do not utilise lactose (d) they cannot transport lactose from the medium into the cell.

Last Answer : (b) they cannot synthesise functional beta galactosidase

Gene regulation governing lactose operon of E.coli that involves the lac I gene product is (a) negative and repressible because repressor protein prevents transcription (b) feedback inhibition because excess of β-galactosidase can switch off transcription (c) positive and inducible because it can be induced by lactose (d) negative and inducible because repressor protein prevents transcription.

Description : Gene regulation governing lactose operon of E.coli that involves the lac I gene product is (a) negative and repressible because repressor protein prevents transcription (b) feedback inhibition ... be induced by lactose (d) negative and inducible because repressor protein prevents transcription.

Last Answer : (d) negative and inducible because repressor protein prevents transcription.

In E. coli, during lactose metabolism repressor binds to (a) regulator gene (b) operator gene (c) structural gene (d) promoter gen

Description : In E. coli, during lactose metabolism repressor binds to (a) regulator gene (b) operator gene (c) structural gene (d) promoter gen

Last Answer : (b) operator gene

Select the correct match. (a) Alec Jeffreys - Streptococcus pneumoniae (b) Alfred Hershey and - TMV Martha Chase (c) Matthew Meselson - Pisum sativum and F. Stahl (d) Francois Jacob and - Lac operon Jacques Monod

Description : Select the correct match. (a) Alec Jeffreys - Streptococcus pneumoniae (b) Alfred Hershey and - TMV Martha Chase (c) Matthew Meselson - Pisum sativum and F. Stahl (d) Francois Jacob and - Lac operon Jacques Monod

Last Answer : (a) Alec Jeffreys - Streptococcus pneumoniae

Select the correct match. (a) Alec Jeffreys - Streptococcus pneumoniae (b) Alfred Hershey and - TMV Martha Chase (c) Matthew Meselson - Pisum sativum and F. Stahl (d) Francois Jacob and - Lac operon Jacques Monod

Description : Select the correct match. (a) Alec Jeffreys - Streptococcus pneumoniae (b) Alfred Hershey and - TMV Martha Chase (c) Matthew Meselson - Pisum sativum and F. Stahl (d) Francois Jacob and - Lac operon Jacques Monod

Last Answer : (d) Francois Jacob and - Lac operon Jacques Monod

Select the correct match : (1) Alec Jeffreys – Streptococcus pneumoniae (2) Alfred Hershey and – TMV Martha Chase (3) Matthew Meselson – Pisum sativum and F. Stahl (4) Francois Jacob and – Lac operon Jacques Monod

Description : Select the correct match : (1) Alec Jeffreys – Streptococcus pneumoniae (2) Alfred Hershey and – TMV Martha Chase (3) Matthew Meselson – Pisum sativum and F. Stahl (4) Francois Jacob and – Lac operon Jacques Monod

Last Answer : (4) Francois Jacob and – Lac operon Jacques Monod

Some DNA is present in mitochondria of (A) Prokaryotes (B) Eukaryotes (C) Both (A) and (B) (D) None of these

Description : Some DNA is present in mitochondria of (A) Prokaryotes (B) Eukaryotes (C) Both (A) and (B) (D) None of these

Last Answer : Answer : B

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea? (a) Archaea completely differ from both prokaryotes and eukaryotes. (b) Archaea completely differ from prokaryotes. (c) Archaea resemble eukarya in all respects. (d) Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Description : In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea? (a) Archaea ... respects. (d) Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Last Answer : (d) Archaea have some novel features that are absent in other prokaryotes and eukaryote

$ Unicellular eukaryotes are the simplest organisms. ! Prokaryotes have the mitochondria whereas eukaryotes are without mitochondria.

Description : $ Unicellular eukaryotes are the simplest organisms. ! Prokaryotes have the mitochondria whereas eukaryotes are without mitochondria.

Last Answer : $ Unicellular eukaryotes are the simplest organisms. ! Prokaryotes have the mitochondria whereas eukaryotes are ... . If both As and R are wrong.

What do eukaryotes cells have that prokaryotes don't?

Description : What do eukaryotes cells have that prokaryotes don't?

Last Answer : Need answer

How are prokaryotes and eukaryotes are similar?

Description : How are prokaryotes and eukaryotes are similar?

Last Answer : Ribosome

All of the following statements about puromycin are true except (A) It is an alanyl tRNA analogue (B) It causes premature termination of protein synthesis (C) It inhibits protein synthesis in prokaryotes (D) It inhibits protein synthesis in eukaryotes

Description : All of the following statements about puromycin are true except (A) It is an alanyl tRNA analogue (B) It causes premature termination of protein synthesis (C) It inhibits protein synthesis in prokaryotes (D) It inhibits protein synthesis in eukaryotes

Last Answer : Answer : A

Puromycin causes premature chain termination in (A) Prokaryotes (B) Eukaryotes (C) Both (A) and (B) (D) None of these

Description : Puromycin causes premature chain termination in (A) Prokaryotes (B) Eukaryotes (C) Both (A) and (B) (D) None of these

Last Answer : Answer : C

A polycistronic mRNA can be seen in (A) Prokaryotes (B) Eukaryotes (C) Mitochondria (D) All of these

Description : A polycistronic mRNA can be seen in (A) Prokaryotes (B) Eukaryotes (C) Mitochondria (D) All of these

Last Answer : Answer : A

Ciprofloxacin inhibits the synthesis of (A) DNA in prokaryotes (B) DNA in prokaryotes and eukaryotes (C) RNA in prokaryotes (D) RNA in prokaryotes and eukaryotes

Description : Ciprofloxacin inhibits the synthesis of (A) DNA in prokaryotes (B) DNA in prokaryotes and eukaryotes (C) RNA in prokaryotes (D) RNA in prokaryotes and eukaryotes

Last Answer : Answer : A

α-Amanitin inhibits (A) DNA polymerase II of prokaryotes (B) DNA polymerase α of eukaryotes (C) RNA polymerase II of eukaryotes (D) RNA-dependent DNA polymerase

Description : α-Amanitin inhibits (A) DNA polymerase II of prokaryotes (B) DNA polymerase α of eukaryotes (C) RNA polymerase II of eukaryotes (D) RNA-dependent DNA polymerase

Last Answer : Answer : C

Are prokaryotes and eukaryotes similar in any respects?

Description : Are prokaryotes and eukaryotes similar in any respects?

Last Answer : Prokaryotes and eukaryotes share common features, among them the possession of nucleic acids and other organic substances such as proteins, carbohydrates, and lipids. In addition, they utilize similar ... although the mode of reproduction may be different and different organs of motility may exist.

The eukaryotic genome differs from the prokaryotic genome because (a) the DNA is complexed with histone in prokaryotes (b) the DNA is circular and single stranded in prokaryotes (c) repetitive sequences are present in eukaryotes (d) genes in the former case are organised into operons.

Description : The eukaryotic genome differs from the prokaryotic genome because (a) the DNA is complexed with histone in prokaryotes (b) the DNA is circular and single stranded in prokaryotes (c) repetitive sequences are present in eukaryotes (d) genes in the former case are organised into operons.

Last Answer : (b) the DNA is circular and single stranded in prokaryotes

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is (a) isocitrate dehydrogenase (b) malate dehydrogenase (c) succinate dehydrogenase (d) lactate dehydrogenase.

Description : All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is (a) isocitrate dehydrogenase (b) malate dehydrogenase (c) succinate dehydrogenase (d) lactate dehydrogenase.

Last Answer : (c) succinate dehydrogenase

Select the mismatch. (a) Gas vacuoles – Green bacteria (b) Large central vacuoles – Animal cells (c) Protists – Eukaryotes (d) Methanogens – Prokaryotes

Description : Select the mismatch. (a) Gas vacuoles – Green bacteria (b) Large central vacuoles – Animal cells (c) Protists – Eukaryotes (d) Methanogens – Prokaryotes

Last Answer : (b) Large central vacuoles – Animal cells

Entner-Doudoroff pathway is found in A-aerobic prokaryotes B- anaerobic prokaryotes C- both (a) and (b) D-aerobic eukaryotes

Description : Entner-Doudoroff pathway is found in A-aerobic prokaryotes B- anaerobic prokaryotes C- both (a) and (b) D-aerobic eukaryotes

Last Answer : both (a) and (b)

The most significant reason why fungi are not in the kingdom Plantae is that fungiA- .are chemoorganotrophic heterotrophs B- have unicellular and multi-cellular forms C- are prokaryotes D- are eukaryotes

Description : The most significant reason why fungi are not in the kingdom Plantae is that fungiA- .are chemoorganotrophic heterotrophs B- have unicellular and multi-cellular forms C- are prokaryotes D- are eukaryotes

Last Answer : .are chemoorganotrophic heterotrophs

What is evidence for the endosymbiotic theory? a. Ribosomes are the same size in eukaryotes and prokaryotes b. Organelles like mitochondria and cholorplasts have their own dna and ribosomes c. Flagella are the same in both types of cells d. A-C are correct

Description : What is evidence for the endosymbiotic theory? a. Ribosomes are the same size in eukaryotes and prokaryotes b. Organelles like mitochondria and cholorplasts have their own dna and ribosomes c. Flagella are the same in both types of cells d. A-C are correct

Last Answer : b. Organelles like mitochondria and cholorplasts have their own dna and ribosomes

All of the following are found in prokaryotes and eukaryotes, except a. acell (plasma) membrane b. mitochondria c. cytoplasm d. ribosome

Description : All of the following are found in prokaryotes and eukaryotes, except a. acell (plasma) membrane b. mitochondria c. cytoplasm d. ribosome

Last Answer : b. mitochondria

The DNA polymerase commonly used in polymerase chain reaction is obtained from (A) E. coli (B) Yeast (C) T.aquaticus (D) Eukaryotes

Description : The DNA polymerase commonly used in polymerase chain reaction is obtained from (A) E. coli (B) Yeast (C) T.aquaticus (D) Eukaryotes

Last Answer : Answer : C

Which of the following genes of the E.coli “Lac operon” codes for a constitutive protein? (A) The ‘a’ gene (B) The ‘i’ gene (C) The ‘c’ gene (D) The ‘z’ gene

Description : Which of the following genes of the E.coli “Lac operon” codes for a constitutive protein? (A) The ‘a’ gene (B) The ‘i’ gene (C) The ‘c’ gene (D) The ‘z’ gene

Last Answer : Answer : B

Lac operon of E. coli contains _______ is continuity. (A) Regulator and operator genes only (B) Operator and structural genes only (C) Regular and structural genes only (D) Regulator, operator and structural genes

Description : Lac operon of E. coli contains _______ is continuity. (A) Regulator and operator genes only (B) Operator and structural genes only (C) Regular and structural genes only (D) Regulator, operator and structural genes

Last Answer : Answer : D

Lac operon is a cluster of genes present in (A) Human beings (B) E. coli (C) Lambda phage (D) All of these

Description : Lac operon is a cluster of genes present in (A) Human beings (B) E. coli (C) Lambda phage (D) All of these

Last Answer : Answer : B

A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called A.activationB.attenuation C.corepression D.desiccation

Description : A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called A.activation B.attenuation C.corepression D.desiccation

Last Answer : B.attenuation

In E coli Lac operon gets switched on when:

Description : 5. In E coli Lac operon gets switched on when: a) Lactose is present and binds to the repressor b) Repressor binds to the operator c) RNA polymerase binds to the operator d) Lactose is present and binds to the RNA polymerase

Last Answer : a) Lactose is present and binds to the repressor

Select the incorrect statement out of the five given below about lac operon when Lactose is present in the medium. a) Gene – A gets transcribed into mRNA which produces β-galactoside permease b) Inducer-Repressor complex is formed c) Lactose inactivates repressor protein d) RNA polymerase transcribe Z-gene, Y-gene and A-gene e) Allolactose is the inducer of lac operon

Description : Select the incorrect statement out of the five given below about lac operon when Lactose is present in the medium. a) Gene - A gets transcribed into mRNA which produces β-galactoside permease b) ... polymerase transcribe Z-gene, Y-gene and A-gene e) Allolactose is the inducer of lac operon

Last Answer : Gene – A gets transcribed into mRNA which produces β-galactoside permease b) Inducer-Repressor complex is formed

In lac operon, lactose acts are

Description : In lac operon, lactose acts are

Last Answer : In lac operon, lactose acts are A. Inducer B. Co-inducer C. Repressor D. Co-repressor

Expression of structural genes of lac operon is affected by all the following except (A) Lactose or its analogues (B) Repressor tetramer (C) cAMP (D) CAP-cAMP complex

Description : Expression of structural genes of lac operon is affected by all the following except (A) Lactose or its analogues (B) Repressor tetramer (C) cAMP (D) CAP-cAMP complex

Last Answer : Answer : C

Lactose or its analogues act as positive regulators of lac operon by (A) Attaching to i gene and preventing its expression (B) Increasing the synthesis of catabolite gene activator protein (C) Attaching to promoter region and facilitating the binding of RNA polymerase holoenzyme (D) Binding to repressor subunits so that the repressor cannot attach to the operator locus

Description : Lactose or its analogues act as positive regulators of lac operon by (A) Attaching to i gene and preventing its expression (B) Increasing the synthesis of catabolite gene activator protein (C) ... holoenzyme (D) Binding to repressor subunits so that the repressor cannot attach to the operator locus

Last Answer : Answer : D

The enzymes encoded by z, y and a genes of lac operon are inducible, and their inducer is (A) Lactose (B) Allo-lactose (C) Catabolite gene activator protein (D) All of these

Description : The enzymes encoded by z, y and a genes of lac operon are inducible, and their inducer is (A) Lactose (B) Allo-lactose (C) Catabolite gene activator protein (D) All of these

Last Answer : Answer : B

Trancription of z, y and a genes of lac operon is prevented by (A) Lactose (B) Allo-lactose (C) Repressor (D) cAMP

Description : Trancription of z, y and a genes of lac operon is prevented by (A) Lactose (B) Allo-lactose (C) Repressor (D) cAMP

Last Answer : Answer : C

Which of the following is required as inducer(s) for the expression of Lac operon? (a) Lactose (b) Lactose and galactose (c) Glucose (d) Galactose

Description : Which of the following is required as inducer(s) for the expression of Lac operon? (a) Lactose (b) Lactose and galactose (c) Glucose (d) Galactose

Last Answer : (c) Glucose

What does “lac” refer to in what we call the lac operon? (a) Lactose (b) Lactase (c) Lac insect (d) The number 1,00,000

Description : What does “lac” refer to in what we call the lac operon? (a) Lactose (b) Lactase (c) Lac insect (d) The number 1,00,000

Last Answer : (a) Lactose

Which of the following is required as inducer(s) for the expression of Lac operon? (a) Lactose (b) Lactose and galactose (c) Glucose (d) Galactose

Description : Which of the following is required as inducer(s) for the expression of Lac operon? (a) Lactose (b) Lactose and galactose (c) Glucose (d) Galactose

Last Answer : Lactose

5. Lac operon transcribed when a) lactose is needed by the cell b) lactose is available to the cell c) lactic acid is needed by the cell d) lactic acid is available to the cell

Description : 5. Lac operon transcribed when a) lactose is needed by the cell b) lactose is available to the cell c) lactic acid is needed by the cell d) lactic acid is available to the cell

Last Answer : b) lactose is available to the cell

In the ’lac operon’ concept, which of the following is a protein? (A) Operator (B) Repressor (C) Inducer (D) Vector

Description : In the ’lac operon’ concept, which of the following is a protein? (A) Operator (B) Repressor (C) Inducer (D) Vector

Last Answer : Answer : B

In the lac operon concept, a protein molecule is (A) Operator (B) Inducer (C) Promoter (D) Repressor

Description : In the lac operon concept, a protein molecule is (A) Operator (B) Inducer (C) Promoter (D) Repressor

Last Answer : Answer : D

Regulator gene controls chemical synthesis (Operon concept) by (a) Inhibiting transcription of mRNA (b) Inhibiting enzymes (c) Inhibiting passage of mRNA (d) Inhibiting substrate enzyme reaction

Description : Regulator gene controls chemical synthesis (Operon concept) by (a) Inhibiting transcription of mRNA (b) Inhibiting enzymes (c) Inhibiting passage of mRNA (d) Inhibiting substrate enzyme reaction

Last Answer : Ans. ((a))

In operon concept, regulator gene functions as (a) inhibitor (b) repressor (c) regulator (d) all of these.

Description : In operon concept, regulator gene functions as (a) inhibitor (b) repressor (c) regulator (d) all of these.

Last Answer : a) inhibitor

If no primer DNA was given, the following scientist could not have synthesized DNA. (A) Ochoa (B) Okazaki (C) Kornberg (D) Monod

Description : If no primer DNA was given, the following scientist could not have synthesized DNA. (A) Ochoa (B) Okazaki (C) Kornberg (D) Monod

Last Answer : Answer : C