347636
The protein products of the \(B t\) toxin genes cryIAc and cryIIAb are responsible for controlling
1 Fruit fly
2 Corn borer
3 Bollworm
4 Moth
Explanation:
Two cry genes, cryIAc and cryIIAb have been incorporated in cotton. These genes control cotton bollworms.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347637
The Bt toxin is not toxic to human beings because
1 Conversion of pro Bt toxin to Bt toxin takes place in highly alkaline conditions
2 Bt toxin recognizes only insect specific targets
3 The pro Bt toxin activation requires \(\mathrm{pH}\) lower than that present in human stomach
4 The pro Bt toxin activation requires temperature above human body temperature
Explanation:
Human stomach is acidic in nature , whereas pro \(\mathrm{Bt}\) toxin is converted to \(\mathrm{Bt}\) toxin in highly alkaline conditions which are not present in human stomach.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347638
Out of the following which method/ process is used for increasing food production?
1 Agrochemical based agriculture, Organic agriculture
2 Genetically engineered crop-based agriculture
3 Both 1 and 2
4 Using high quantities of chemical fertilisers and pesticides
Explanation:
Three options that can be thought for increasing food production (i) agro-chemical based agriculture; (ii) organic agriculture; and (iii) genetically engineered crop-based agriculture.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347639
Statement A : The inactive protoxin gets converted into active form in the insect gut Statement B : Bt proteins exist as active toxins in the Bacillus
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Bacillus thuringiensis is biopesticide, commonly known as \(\mathrm{Bt}\), is a naturally occurring, gram-positive, spore-forming soil bacterium. Bt has been known to be reservoir of several insecticidal proteins, such as endotoxins, cytolytic proteins, vegetative insecticidal proteins, etc. During sporulation, it synthesizes a cytoplasmic inclusion containing one or more proteins that are toxic to insect larvae. Upon completion of sporulation the parent bacterium lyses to release the spore and the inclusion. In these inclusions, the toxins exist as inactive protoxins. When the inclusions are ingested by insect larvae, the alkaline \(\mathrm{pH}\) solubilizes the crystal. The protoxin is then converted in to an active toxin after processing by the host proteases present in the midgut. Bacillus thuringiensis (Bt) is a Gram-positive bacterium that produces crystals during sporulation. These crystals comprise of one or a small number of \(\sim 130 \mathrm{kDa}\) protoxins called as crystal proteins and exists as inactive protoxin in the Bacillus. These proteins are potent and highly specific insecticides. Statement-A is correct.
347636
The protein products of the \(B t\) toxin genes cryIAc and cryIIAb are responsible for controlling
1 Fruit fly
2 Corn borer
3 Bollworm
4 Moth
Explanation:
Two cry genes, cryIAc and cryIIAb have been incorporated in cotton. These genes control cotton bollworms.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347637
The Bt toxin is not toxic to human beings because
1 Conversion of pro Bt toxin to Bt toxin takes place in highly alkaline conditions
2 Bt toxin recognizes only insect specific targets
3 The pro Bt toxin activation requires \(\mathrm{pH}\) lower than that present in human stomach
4 The pro Bt toxin activation requires temperature above human body temperature
Explanation:
Human stomach is acidic in nature , whereas pro \(\mathrm{Bt}\) toxin is converted to \(\mathrm{Bt}\) toxin in highly alkaline conditions which are not present in human stomach.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347638
Out of the following which method/ process is used for increasing food production?
1 Agrochemical based agriculture, Organic agriculture
2 Genetically engineered crop-based agriculture
3 Both 1 and 2
4 Using high quantities of chemical fertilisers and pesticides
Explanation:
Three options that can be thought for increasing food production (i) agro-chemical based agriculture; (ii) organic agriculture; and (iii) genetically engineered crop-based agriculture.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347639
Statement A : The inactive protoxin gets converted into active form in the insect gut Statement B : Bt proteins exist as active toxins in the Bacillus
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Bacillus thuringiensis is biopesticide, commonly known as \(\mathrm{Bt}\), is a naturally occurring, gram-positive, spore-forming soil bacterium. Bt has been known to be reservoir of several insecticidal proteins, such as endotoxins, cytolytic proteins, vegetative insecticidal proteins, etc. During sporulation, it synthesizes a cytoplasmic inclusion containing one or more proteins that are toxic to insect larvae. Upon completion of sporulation the parent bacterium lyses to release the spore and the inclusion. In these inclusions, the toxins exist as inactive protoxins. When the inclusions are ingested by insect larvae, the alkaline \(\mathrm{pH}\) solubilizes the crystal. The protoxin is then converted in to an active toxin after processing by the host proteases present in the midgut. Bacillus thuringiensis (Bt) is a Gram-positive bacterium that produces crystals during sporulation. These crystals comprise of one or a small number of \(\sim 130 \mathrm{kDa}\) protoxins called as crystal proteins and exists as inactive protoxin in the Bacillus. These proteins are potent and highly specific insecticides. Statement-A is correct.
347636
The protein products of the \(B t\) toxin genes cryIAc and cryIIAb are responsible for controlling
1 Fruit fly
2 Corn borer
3 Bollworm
4 Moth
Explanation:
Two cry genes, cryIAc and cryIIAb have been incorporated in cotton. These genes control cotton bollworms.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347637
The Bt toxin is not toxic to human beings because
1 Conversion of pro Bt toxin to Bt toxin takes place in highly alkaline conditions
2 Bt toxin recognizes only insect specific targets
3 The pro Bt toxin activation requires \(\mathrm{pH}\) lower than that present in human stomach
4 The pro Bt toxin activation requires temperature above human body temperature
Explanation:
Human stomach is acidic in nature , whereas pro \(\mathrm{Bt}\) toxin is converted to \(\mathrm{Bt}\) toxin in highly alkaline conditions which are not present in human stomach.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347638
Out of the following which method/ process is used for increasing food production?
1 Agrochemical based agriculture, Organic agriculture
2 Genetically engineered crop-based agriculture
3 Both 1 and 2
4 Using high quantities of chemical fertilisers and pesticides
Explanation:
Three options that can be thought for increasing food production (i) agro-chemical based agriculture; (ii) organic agriculture; and (iii) genetically engineered crop-based agriculture.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347639
Statement A : The inactive protoxin gets converted into active form in the insect gut Statement B : Bt proteins exist as active toxins in the Bacillus
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Bacillus thuringiensis is biopesticide, commonly known as \(\mathrm{Bt}\), is a naturally occurring, gram-positive, spore-forming soil bacterium. Bt has been known to be reservoir of several insecticidal proteins, such as endotoxins, cytolytic proteins, vegetative insecticidal proteins, etc. During sporulation, it synthesizes a cytoplasmic inclusion containing one or more proteins that are toxic to insect larvae. Upon completion of sporulation the parent bacterium lyses to release the spore and the inclusion. In these inclusions, the toxins exist as inactive protoxins. When the inclusions are ingested by insect larvae, the alkaline \(\mathrm{pH}\) solubilizes the crystal. The protoxin is then converted in to an active toxin after processing by the host proteases present in the midgut. Bacillus thuringiensis (Bt) is a Gram-positive bacterium that produces crystals during sporulation. These crystals comprise of one or a small number of \(\sim 130 \mathrm{kDa}\) protoxins called as crystal proteins and exists as inactive protoxin in the Bacillus. These proteins are potent and highly specific insecticides. Statement-A is correct.
347636
The protein products of the \(B t\) toxin genes cryIAc and cryIIAb are responsible for controlling
1 Fruit fly
2 Corn borer
3 Bollworm
4 Moth
Explanation:
Two cry genes, cryIAc and cryIIAb have been incorporated in cotton. These genes control cotton bollworms.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347637
The Bt toxin is not toxic to human beings because
1 Conversion of pro Bt toxin to Bt toxin takes place in highly alkaline conditions
2 Bt toxin recognizes only insect specific targets
3 The pro Bt toxin activation requires \(\mathrm{pH}\) lower than that present in human stomach
4 The pro Bt toxin activation requires temperature above human body temperature
Explanation:
Human stomach is acidic in nature , whereas pro \(\mathrm{Bt}\) toxin is converted to \(\mathrm{Bt}\) toxin in highly alkaline conditions which are not present in human stomach.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347638
Out of the following which method/ process is used for increasing food production?
1 Agrochemical based agriculture, Organic agriculture
2 Genetically engineered crop-based agriculture
3 Both 1 and 2
4 Using high quantities of chemical fertilisers and pesticides
Explanation:
Three options that can be thought for increasing food production (i) agro-chemical based agriculture; (ii) organic agriculture; and (iii) genetically engineered crop-based agriculture.
BIOXII12: BIOTECHNOLOGY AND ITS APPLICATIONS
347639
Statement A : The inactive protoxin gets converted into active form in the insect gut Statement B : Bt proteins exist as active toxins in the Bacillus
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Bacillus thuringiensis is biopesticide, commonly known as \(\mathrm{Bt}\), is a naturally occurring, gram-positive, spore-forming soil bacterium. Bt has been known to be reservoir of several insecticidal proteins, such as endotoxins, cytolytic proteins, vegetative insecticidal proteins, etc. During sporulation, it synthesizes a cytoplasmic inclusion containing one or more proteins that are toxic to insect larvae. Upon completion of sporulation the parent bacterium lyses to release the spore and the inclusion. In these inclusions, the toxins exist as inactive protoxins. When the inclusions are ingested by insect larvae, the alkaline \(\mathrm{pH}\) solubilizes the crystal. The protoxin is then converted in to an active toxin after processing by the host proteases present in the midgut. Bacillus thuringiensis (Bt) is a Gram-positive bacterium that produces crystals during sporulation. These crystals comprise of one or a small number of \(\sim 130 \mathrm{kDa}\) protoxins called as crystal proteins and exists as inactive protoxin in the Bacillus. These proteins are potent and highly specific insecticides. Statement-A is correct.
