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Which of the following is NOT a type of RNA molecule mentioned in the context?
The NCERT text lists, 'RNA molecules are of three types and they perform different functions. They are named as messenger RNA (m-RNA), ribosomal RNA (r-RNA) and transfer RNA (t-RNA).' snRNA is not mentioned.
Friedrich Meischer identified DNA as an acidic substance in the nucleus in 1869 and named it:
The NCERT text states, 'DNA as an acidic substance present in nucleus was first identified by Friedrich Meischer in 1869. He named it as 'Nuclein'.'
A nucleotide differs from a nucleoside by the presence of a:
The NCERT text states, 'When found attached to a sugar, they are called nucleosides. If a phosphate group is also found esterified to the sugar they are called nucleotides.' This indicates that the phosphate group is the differentiating factor.
The sequential information regarding the order of nucleotides in a nucleic acid chain is known as its:
The NCERT text defines this as, 'Information regarding the sequence of nucleotides in the chain of a nucleic acid is called its primary structure.'
What is the typical structure of RNA molecules as described in the context?
The NCERT text contrasts RNA with DNA: 'In secondary structure of RNA single stranded helics is present which sometimes foldsback on itself.' It also mentions, 'The structure of DNA is a double strand whereas RNA is a single strand molecule.'
Which carbon atom of the sugar moiety in a nucleoside is numbered 1'?
The NCERT states, 'A unit formed by the attachment of a base to 1¢ position of sugar is known as nucleoside. In nucleosides, the sugar carbons are numbered as 1¢, 2¢, 3¢, etc. in order to distinguish these from the bases.'
Bt toxin, once activated in the insect gut, binds to the surface of which specific type of cells?
According to the provided text, 'The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.'
Which of the following insect orders is NOT explicitly mentioned as being targeted by some strains of Bacillus thuringiensis toxin?
The text states that Bt toxin kills 'lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes)'. Hymenopterans are not mentioned.
The inactive protoxin form of Bt toxin needs to be converted into an active form due to what specific characteristic of the insect gut environment?
The text clearly states, 'once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.'
Which of the following is a direct consequence of the activated Bt toxin binding to insect midgut epithelial cells?
The text explains, 'The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.