What is ‘Lac’? -SST 10th

What is ‘Lac’? -SST 10th
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1 Answer

Answer :

Lac is a gum-like substance which is gathered from the branches of several trees like Banyan, Sisu, Ghont, Pipal, Khair. An insect known by the name of ‘Laccifer-lacca’ breeds on the branches of these trees and it ejects a secretion from its mouth. This secretion when it dries, sticks to the branches and is collected by the forest-dwellers. It is then purified and turned into ‘shellac’ or ‘seed-lac’, which is the raw material for plastics, insulators, felt-hats, sealing wax, paints and varnishes. Kolkata and Mirzapur are two big centres for its purification. Lac brings in . lot of foreign exchange.
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What genes are parts of the lac operon? -Biology

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What is the full form of LAC ?

Last Answer : LAC - Line of Actual Control

In Lac-operon, repressor protein binds to

Description : In Lac-operon, repressor protein binds to

Last Answer : In Lac-operon, repressor protein binds to A. Regulator gene B. Operator gene C. Promoter gene D. Structural gene

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

The largest producer of Lac in India is

Description : The largest producer of Lac in India is

Last Answer : Jharkhand

The chief competitor of India in the field of lac is (a) Thailand (b) The United States of America (c) Japan (d) China

Description : The chief competitor of India in the field of lac is (a) Thailand (b) The United States of America (c) Japan (d) China

Last Answer : Ans: (a)

Lac is used in making (a) Gramophone records (b) Varnish (c) Sealing wax and lithographic ink (d) All the above

Description : Lac is used in making (a) Gramophone records (b) Varnish (c) Sealing wax and lithographic ink (d) All the above

Last Answer : Ans: (d)

Lac is secreted by (a) trees like rubber (b) certain kinds of birds (c) some animals (d) a certain type of insect which feeds on the saps of trees such as Palas, Ber and Kusum

Description : Lac is secreted by (a) trees like rubber (b) certain kinds of birds (c) some animals (d) a certain type of insect which feeds on the saps of trees such as Palas, Ber and Kusum

Last Answer : Ans: (d)

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

The region of the Lac operon which must be free from structural gene transcription to occur is (A) The operator locus (B) The promoter site (C) The ‘a’ gene (D) The ‘i’ gene

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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

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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

The coding sequences in lac operon include (A) i gene (B) i gene, operator locus and promoter (C) z, y and a genes (D) i, z, y and a genes

Description : The coding sequences in lac operon include (A) i gene (B) i gene, operator locus and promoter (C) z, y and a genes (D) i, z, y and a genes

Last Answer : Answer : D

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

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Last Answer : Answer : D

Binding of RNA polymerase holoenzyme to the promoter region of lac operon is facilitated by (A) Catabolite gene activator protein (CAP) (B) cAMP (C) CAP-cAMP complex (D) None of these

Description : Binding of RNA polymerase holoenzyme to the promoter region of lac operon is facilitated by (A) Catabolite gene activator protein (CAP) (B) cAMP (C) CAP-cAMP complex (D) None of these

Last Answer : Answer : C

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

Transcription of structural genes of lac operon is prevented by binding of the repressor tetramer to (A) i gene (B) Operator locus (C) Promoter (D) z gene

Description : Transcription of structural genes of lac operon is prevented by binding of the repressor tetramer to (A) i gene (B) Operator locus (C) Promoter (D) z gene

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

RNA polymerase holoenzyme binds to lac operon at the following site: (A) i gene (B) z gene (C) Operator locus (D) Promoter region

Description : RNA polymerase holoenzyme binds to lac operon at the following site: (A) i gene (B) z gene (C) Operator locus (D) Promoter region

Last Answer : Answer : D

The regulatory i gene of lac operon (A) Is inhibited by lacotse (B) Is inhibited by its own product, the repressor protein (C) Forms a regulatory protein which increases the expression of downstream structural genes (D) Is constitutively expressed

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Lac operon is a cluster of (A) Three structural genes (B) Three structural genes and their promoter (C) A regulatory gene, an operator and a promoter (D) A regulatory gene, an operator, a promoter and three structural genes

Description : Lac operon is a cluster of (A) Three structural genes (B) Three structural genes and their promoter (C) A regulatory gene, an operator and a promoter (D) A regulatory gene, an operator, a promoter and three 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

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

To commence structural gene transcription the region which should be free on lac operation is (A) Promoter site (B) Operator locus (C) Y gene (D) A gene

Description : To commence structural gene transcription the region which should be free on lac operation is (A) Promoter site (B) Operator locus (C) Y gene (D) A gene

Last Answer : Answer : B

The minimum effective size of an operator for lac repressor binding is (A) 5 base pairs (B) 10 base pairs (C) 15 base pairs (D) 17 base pairs

Description : The minimum effective size of an operator for lac repressor binding is (A) 5 base pairs (B) 10 base pairs (C) 15 base pairs (D) 17 base pairs

Last Answer : Answer : D

The gene of lac operon which has constitutive expression is (A) i (B) c (C) z (D) p

Description : The gene of lac operon which has constitutive expression is (A) i (B) c (C) z (D) p

Last Answer : Answer : A

The largest producer of Lac in India is (1) Chhattisgarh (2) Jharkhand (3) West Bengal (4) Gujarat

Description : The largest producer of Lac in India is (1) Chhattisgarh (2) Jharkhand (3) West Bengal (4) Gujarat

Last Answer : (2) Jharkhand Explanation: The leading producer of lac is Jharkhand, followed by the Chhattisgarh, West Bengal, and Maharashtra. Lac is the scarlet resinous secretion of a number of species of lac insects, of which the most commonly cultivated species is Kerria lacca.

Lac, which is used as sealing wax is produced by - (1) stem (2) root (3) insect (4) bird

Description : Lac, which is used as sealing wax is produced by - (1) stem (2) root (3) insect (4) bird

Last Answer : (3) insect Explanation: Lac is the scarlet resinous secretion of a number of species of insects. There are several lac insects, some of which secrete highly pigmented wax. The Indian lac insect Laccifer lacca is important commercially.

Lac is produced from - (1) atree (2) an insect (3) an cat (4) amuskrat

Description : Lac is produced from - (1) atree (2) an insect (3) an cat (4) amuskrat

Last Answer : (2) an insect Explanation: Lac is the scarlet resinous secretion of a number of species of insects, namely some of the species of the genera Metatachardia, Laccifer, Tachordiella, ... Tachardina of the superfamily Coccoidea, of which the most commonly cultivated species is Kerria lacca.

Fee for filing complaints before state commission above 50 lac and up to 1 crore is a) 5000 rupees b) 2500 rupees c) 4000 rupees d) 2000 rupees

Description : Fee for filing complaints before state commission above 50 lac and up to 1 crore is a) 5000 rupees b) 2500 rupees c) 4000 rupees d) 2000 rupees

Last Answer : c) 4000 rupees

Fee for filing complaints before state commission above 20 lac and up to 50 lac is a) 5000 rupees b) 2500 rupees c) 4000 rupees d) 2000 rupees

Description : Fee for filing complaints before state commission above 20 lac and up to 50 lac is a) 5000 rupees b) 2500 rupees c) 4000 rupees d) 2000 rupees

Last Answer : d) 2000 rupees

Fee for filing complaints before district forum above ten lac and up to twenty lac is a) 500 rupees b) 250 rupees c) 400 rupees d) 1000 rupees

Description : Fee for filing complaints before district forum above ten lac and up to twenty lac is a) 500 rupees b) 250 rupees c) 400 rupees d) 1000 rupees

Last Answer : a) 500 rupees

Fee for filing complaints before district forum above five lac and up to ten lac is a) 200 rupees b) 250 rupees c) 400 rupees d) No fee

Description : Fee for filing complaints before district forum above five lac and up to ten lac is a) 200 rupees b) 250 rupees c) 400 rupees d) No fee

Last Answer : c) 400 rupees

Fee for filing complaints before district forum above one lac and up to five lac is a) 200 rupees b) 250 rupees c) 100 rupees d) No fee

Description : Fee for filing complaints before district forum above one lac and up to five lac is  a) 200 rupees b) 250 rupees c) 100 rupees d) No fee

Last Answer : a) 200 rupees

Jurisdiction of State commission is a) Complaint where the value of the goods or services and compensation, if any claimed exceeds Rs 20 Lac b) Complaint where the value of the goods or services and compensation, if anyclaimed up to 1 crorec) Appeals against the orders of any district forum within the stated) Complaint where the value of the goods or services and compensation, if anyclaimed exceeds Rs 20 Lac but does not exceed one croree) C& D only

Description : Jurisdiction of State commission is a) Complaint where the value of the goods or services and compensation, if any claimed exceeds Rs 20 Lac b) Complaint where the value of the goods or services and compensation ... , if any claimed exceeds Rs 20 Lac but does not exceed one crore e) C& D only

Last Answer : e) C& D only

Jurisdiction of district for is rupees a) Exceed twenty lac b) exceed 50 lac c) Up to twenty lac d) twenty to fifty lac

Description : Jurisdiction of district for is rupees a) Exceed twenty lac b) exceed 50 lac c) Up to twenty lac d) twenty to fifty lac

Last Answer : c) Up to twenty lac

The SCSS account transferred one Post office to another post office a) Rs 5/- per lac will be charged where the deposit is Rs 1 lac and above b) Rs 10/- per lac will be charged where the deposit is Rs 1 lac and above on second transfer. c) No fee will be charged d) Both the A and B( The fee will be paid by cash through pay in slip

Description : The SCSS account transferred one Post office to another post office a) Rs 5/- per lac will be charged where the deposit is Rs 1 lac and above b) Rs 10/- per lac will be charged where the deposit is Rs 1 ... No fee will be charged d) Both the A and B( The fee will be paid by cash through pay in slip

Last Answer : d) Both the A and B( The fee will be paid by cash through pay in slip

What is the Minimum and maximum deposit in Senior citizen saving scheme a) 500 & 5 Lac b) 1000 & 10 Lacc) 1500 & 15 Lac d) 1000 & 15 Lac

Description : What is the Minimum and maximum deposit in Senior citizen saving scheme a) 500 & 5 Lac b) 1000 & 10 Lac c) 1500 & 15 Lac d) 1000 & 15 Lac

Last Answer : d) 1000 & 15 Lac

What is the maximum limit of deposit in MIS account in single and joint? a) 1.5 lac and 3 lack b) 3 lac and 4.5 lack c) 4.5 lac and 9 lac d) 6 lac and 9 lac

Description : What is the maximum limit of deposit in MIS account in single and joint? a) 1.5 lac and 3 lack b) 3 lac and 4.5 lack c) 4.5 lac and 9 lac d) 6 lac and 9 lac

Last Answer : c) 4.5 lac and 9 lac

Pebrine is a disease of (a) silkworm (b) lac insect (c) honeybee (d) fish.

Description : Pebrine is a disease of (a) silkworm (b) lac insect (c) honeybee (d) fish.

Last Answer : (a) silkworm

In case the balance was above one lac in deceased depositor account___ is necessary a) Witness of responsible person b) Thumb impression of the deceased person c) Succession certificate or Probate of will or letter of administration d) All the above

Description : In case the balance was above one lac in deceased depositor account___ is necessary a) Witness of responsible person b) Thumb impression of the deceased person c) Succession certificate or Probate of will or letter of administration d) All the above

Last Answer : c) Succession certificate or Probate of will or letter of administration

What is the maximum balance may be deposited to Single/ Joint account a) 1 lac/2 lac b) 2lac/3 lac c) No maximum limit d) None of these

Description : What is the maximum balance may be deposited to Single/ Joint account a) 1 lac/2 lac b) 2lac/3 lac c) No maximum limit d) None of these

Last Answer : c) No maximum limit

.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.

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

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