NEET · Biology · STD 12 - 10. biotechnology and its application

Given below are two statements: Statement \(I\) : Bt toxins are insect group specific and coded by a gene cry \(IAc\). Statement \(II\) : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic \(\mathrm{pH}\) of the insect gut. In the light of the above statements, choose the correct answer from the options given below:

A Both Statement \(I\) and Statement \(II\) are false
B Statement \(I\) is true but Statement \(II\) is false
C Statement \(I\) is false but Statement \(II\) is true
D Both Statement \(I\) and Statement \(II\) are true

Verified Solution

Answer & Solution

Correct Answer

(B) Statement \(I\) is true but Statement \(II\) is false

Step-by-step Solution

Detailed explanation

The correct answer is option (\(2\)) as specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into the several crop plants such as cotton. The choice of genes depends upon the crop and the targeted pest as most Bt toxins are insect-group specific. The toxin is coded by a gene named cry. There are a number of them, for example, the proteins encoded by the genes cry \(IAc\) and cry \(\|Ab\) control the cotton bollworms, that of cry \(IAb\) controls corn borer.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List \(-I\) with List \(-II\) :

List \(-I\)	List \(-II\)
\(a\) In lac operon \(i\) gene codes for	\(i\) transacetylase
\(b\) In lac operon \(z\) gene codes for	\(ii\) permease
\(c\) In lac operon \(y\) gene codes for	\(iii\) \(\beta\) - galactosidase
\(d\) In lac operon \(a\) gene codes for	\(iv\) Repressor

Choose the correct answer from the options given below :

NEET 2022 Medium

Given below are two statements:
Statement \(I\): Ligaments are dense irregular tissue.
Statement \(II\): Cartilage is dense regular tissue.
In the light of the above statements, choose the correct answer from the options given below:

NEET 2023 Medium

Explore more questions on app

From NEET

In the following in each set a conservation approach and an example of method of conservation are given
(\(a\)) In situ conservation - Biosphere Reserve
(\(b\)) Ex situ conservation - Sacred groves
(\(c\)) In situ conservation - Seed bank
(\(d\)) Ex situ conservation - Cryopreservation
Select the option with correct match of approach and method

NEET 2020 Easy

Match the following columns and select the correct option.

Column \(- I\)	Column \(- II\)
\((a)\) Floating Ribs	\((i)\) Located between second and seventh ribs
\((b)\) Acromion	\((ii)\) Head of the Humerus
\((c)\) Scapula	\((iii)\) Clavicle
\((d)\) Glenold cavity	\((iv)\) Do not connect with the sternum

\((a)\quad(b) \quad(c) \quad(d)\)

NEET 2020 Easy

Explore more questions on app