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Select the statements that are incorrect...

Select the statements that are incorrect regarding Bt toxin.
(1) The toxin is made by the eukaryotic organism
(2) The toxin is a protein and insecticidal.
(3) they are produced in the active form.
(4) The toxin is coded by the cry gene.

A

All except II and IV

B

All except I,II and IV

C

All except I,II and III

D

All except III and IV

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements regarding Bt toxin are incorrect, let's analyze each statement step by step: 1. **Statement (1): The toxin is made by the eukaryotic organism.** - **Analysis:** Bt toxin is produced by the bacterium *Bacillus thuringiensis*, which is a prokaryotic organism, not a eukaryotic one. Therefore, this statement is **incorrect**. 2. **Statement (2): The toxin is a protein and insecticidal.** - **Analysis:** Bt toxin is indeed a protein that has insecticidal properties, specifically targeting certain insects. This statement is **correct**. 3. **Statement (3): They are produced in the active form.** - **Analysis:** Bt toxins are produced in an inactive form known as protoxin. They become active only when they are ingested by insects and exposed to the alkaline pH of the insect's gut. Therefore, this statement is **incorrect**. 4. **Statement (4): The toxin is coded by the cry gene.** - **Analysis:** The genes responsible for coding the Bt toxin are indeed known as cry genes (e.g., cry1AC, cry2AB). This statement is **correct**. ### Summary of Statements: - **Incorrect Statements:** - (1) The toxin is made by the eukaryotic organism. - (3) They are produced in the active form. - **Correct Statements:** - (2) The toxin is a protein and insecticidal. - (4) The toxin is coded by the cry gene. ### Final Answer: The incorrect statements regarding Bt toxin are (1) and (3). ---
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