Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
A researcher uses Agrobacterium tumefaciens to introduce a gene into a plant cell. Which of the following is NOT a crucial step in this process?
Infection of plant cells with the engineered Agrobacterium
Insertion of the gene of interest into the Ti plasmid
Ligation of the gene into a yeast expression vector
Regeneration of the transformed plant cells
Which technique is LEAST suitable for introducing a foreign gene into a mature plant cell with a thick cell wall?
Biolistics
Agrobacterium-mediated transformation
Microinjection
Heat shock transformation
Why is Escherichia coli commonly used in the production of genetically engineered human insulin?
Easy to culture and genetically manipulate
Produces insulin naturally
Has a similar genome to humans
Is resistant to antibiotics
The process by which a bacterial cell takes up naked DNA from its surroundings is called:
Transduction
Transformation
Conjugation
Translocation
A mutation affects the function of the Hox genes in a developing Drosophila embryo. Which of the following is the MOST likely consequence?
Premature termination of embryonic development.
Failure of gastrulation.
Homeotic transformations, leading to segments developing with characteristics of other segments.
Lack of differentiation of germ layers.
Which observation from Griffith's experiment with Streptococcus pneumoniae provided the strongest evidence for the existence of a 'transforming principle'?
Live non-virulent bacteria did not cause disease in mice.
Heat-killed virulent bacteria did not cause disease in mice.
Live virulent bacteria caused disease in mice.
Heat-killed virulent bacteria, when mixed with live non-virulent bacteria, caused the latter to become virulent.
In Griffith's experiment, which strain of Streptococcus pneumoniae caused the death of mice?
S strain (smooth)
R strain (rough)
Heat-killed S strain
Heat-killed R strain
What did Griffith observe when he injected a mixture of heat-killed S strain and live R strain bacteria into mice?
The mice died, and live S strain bacteria were recovered.
The mice survived.
The mice died, and live R strain bacteria were recovered.
The mice survived, and a new strain of bacteria was recovered.
What was the transforming principle identified by Avery, MacLeod, and McCarty?
Protein
RNA
DNA
Carbohydrates
Which of the following processes needs bacteriophage?
Transduction
Translation
Transformation
Conjugation
