Practice free Biomolecules (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The neural system provides _ coordination, while hormones provide _ coordination.
The text states: 'The neural coordination is fast but short-lived... a special kind of coordination and integration has to be provided. This function is carried out by hormones.'
In which part of the body are 'nuclear receptors' primarily found?
The NCERT text mentions: 'Hormone receptors present on the cell membrane of the target cells are called membrane-bound receptors and the receptors present inside the target cell are called intracellular receptors, mostly nuclear receptors (present in the nucleus)'.
Which of the following structural features primarily contributes to DNA's greater chemical stability compared to RNA?
According to the NCERT text, 'Further, 2'-OH group present at every nucleotide in RNA is a reactive group and makes RNA labile and easily degradable.' Conversely, DNA contains 2-deoxyribose, lacking this reactive 2'-OH group, which contributes to its chemical stability.
What is the primary role of DNA in an organism, according to the provided context?
The summary states: 'While DNA stores genetic information, RNA mostly helps in transfer and expression of information.' Also, 'DNA is the chemical basis of heredity and have the coded message for proteins to be synthesised in the cell.'
Which statement accurately describes a key functional difference between DNA and RNA regarding protein synthesis?
The text states: 'RNA can directly code for the synthesis of proteins, hence can easily express the characters. DNA, however, is dependent on RNA for synthesis of proteins.'
The presence of which base in DNA, as opposed to RNA, confers additional stability to the DNA molecule?
The NCERT text explicitly states: 'In fact, the presence of thymine at the place of uracil also confers additional stability to DNA.'
Which of the following pentose sugars is found in RNA, and how does it differ structurally from the sugar in DNA?
The context mentions: 'DNA contains a five carbon sugar molecule called 2-deoxyribose whereas RNA contains ribose.' And 'Further, 2'-OH group present at every nucleotide in RNA is a reactive group...' indicating ribose has this group, while deoxyribose lacks it.
Why do viruses with RNA genomes often mutate and evolve faster than those with DNA genomes?
The text explains: 'In fact, RNA being unstable, mutate at a faster rate. Consequently, viruses having RNA genome and having shorter life span mutate and evolve faster.'
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.
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every Biomolecules question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.