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Which of the following is NOT a type of RNA mentioned in the context to be involved in protein synthesis?
The context explicitly 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).'
Both DNA and RNA possess all of the following nitrogenous bases EXCEPT:
The text states: 'Both DNA and RNA contain adenine, guanine and cytosine. The fourth base is thymine in DNA and uracil in RNA.' Therefore, thymine is present only in DNA, not both.
Which feature of DNA contributes to its ability to serve as a better genetic material compared to RNA?
The text states: 'Therefore, DNA chemically is less reactive and structurally more stable when compared to RNA. Therefore, among the two nucleic acids, the DNA is a better genetic material.'
The protein synthesizing machinery has evolved around which nucleic acid?
The NCERT text mentions: 'The protein synthesising machinery has evolved around RNA.' And in the summary, 'Translation is a process that has evolved around RNA, indicating that life began around RNA.'
What is the primary structural difference between the secondary structures of DNA and RNA?
The text states: 'James Watson and Francis Crick gave a double strand helix structure for DNA... In secondary structure of RNA single stranded helics is present which sometimes foldsback on itself.'
Which of the following criteria for a genetic material is better fulfilled by DNA than by RNA?
The text lists criteria for genetic material and states: 'The genetic material should be stable enough not to change with different stages of life cycle... Therefore, DNA chemically is less reactive and structurally more stable when compared to RNA. Therefore, among the two nucleic acids, the DNA is a better genetic material.'
In the context of genetic material and evolution, what is the implication of RNA's higher mutation rate?
The context highlights: 'RNA being unstable, mutate at a faster rate. Consequently, viruses having RNA genome and having shorter life span mutate and evolve faster.'
A nucleotide is composed of which three components?
The NCERT text explicitly states: 'A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group.'
Which of the following parts of the nephron and associated structures primarily contribute to establishing the osmolar gradient (300 mOsmolL-1 to 1200 mOsmolL-1) within the kidney interstitium, crucial for concentrating filtrate?
The context explicitly states: 'HL primarily helps to maintain osmolar gradient (300 mOsmolL –1 -1200 mOsmolL –1 ) within the kidney interstitium.' It also mentions, 'A counter current mechanism operates between the two limbs of the loop of Henle and those of vasa recta...The Henle’s loop and vasa recta play a significant role in this.' This mechanism is key to producing concentrated urine.
The flow of filtrate in the two limbs of Henle’s loop and the flow of blood in the two limbs of vasa recta are in opposite directions. This arrangement is known as a:
The text states: 'The flow of filtrate in the two limbs of Henle’s loop is in opposite directions and thus forms a counter current. The flow of blood through the two limbs of vasa recta is also in a counter current pattern.' This opposing flow is the definition of a countercurrent mechanism.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.