#Base Pairs

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This question is based on base pairing rules and the number of hydrogen bonds in DNA. In a double-stranded DNA molecule, adenine (A) pairs with thymine (T) through 2 hydrogen bonds, while guanine (G) pairs with cytosine (C) through 3 hydrogen bonds. The DNA has 100 base pairs, which means there are 100 total pairs of bases. It is given that 30% of the bases are adenine. Since DNA is double stranded and follows Chargaff’s rule, the percentage of adenine will be equal to thymine. So, adenine = 30% and thymine = 30%. Together, A–T pairs make up 60% of the total base pairs. Now calculate the number of A–T pairs: 60% of 100 = 60 base pairs The remaining base pairs must be G–C pairs: 100 − 60 = 40 base pairs Now calculate hydrogen bonds: Each A–T pair has 2 hydrogen bonds → 60 × 2 = 120 Each G–C pair has 3 hydrogen bonds → 40 × 3 = 120 Total hydrogen bonds = 120 + 120 = 240 However, 240 is not present in the options. This means the question is slightly tricky in interpretation. If we interpret “30% of them are adenine” as 30 base pairs being A–T pairs (instead of total bases), then: A–T pairs = 30 → hydrogen bonds = 30 × 2 = 60 G–C pairs = 70 → hydrogen bonds = 70 × 3 = 210 Total = 60 + 210 = 270 Thus, the correct answer based on expected NEET interpretation is 270. Answer: C. 270 #neet2026 #neetbiology #neetaspirants #neetpreparation #neetbiologymcq #ncertbiology #molecularbiology #dnabasics #hydrogenbonds #genetics #biologymcq #mcqpractice #conceptclear #studyforneet #neetrevision #futuredoctor #mbbsaspirant #questionoftheday #rankboost #studymotivation

GCSE Biology - DNA - understand it once and for all #DNA #doublehelix #genes #chromosomes #basepairs #genetics #exams #revision #gcse #stem #school #science #combinedsciencegcse #biology

Before they checked out for the long weekend, we checked IN on DNA structure 🧬🍭. My biology students created edible DNA models to understand: ✔️ the phosphate-sugar backbone ✔️Complementary base pairs (A-T, C-G) ✔️The iconic double helix shape Hands on. Memorable. And maybe a little sticky. This is what I love about teaching science – it’s joyful, meaningful and just the right amount of chaotic.

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The human genome is incredibly complex. It contains around 3 billion base pairs of DNA, forming the genetic instructions that guide how our bodies grow, function, and develop. These tiny molecular “letters” store the blueprint for every human trait, making DNA one of the most fascinating molecules in biology. #DidYouKnow #HumanDNA #Genome #Genetics #ScienceFacts #BiologyFacts #DNAScience #HumanBody #ScienceEducation #alchetron #viral Read more : https://alchetron.com/Human-genome

How does the police 👮 know that the DNA 🧬 at a crime scene actually belongs to a suspect? Through DNA profiling! DNA has areas called Short Tandem Repeats (STRs for short) that are 2-6 base pairs repeating up to 500 base pairs (250 copies 🤯) The FBI 🚓 uses 20 STR locations in the DNA 🧬 for their CODIS database, that means there is a 1 in a trillion chance of a false positive in the test with a quality DNA sample! #science #biology #dna #forensics #crime

🧬 DNA looks complicated… but it follows a SIMPLE rule 👀 Let me break it down for you 👇 🧠 What is DNA? DNA is the instruction manual of the body 📖 It tells cells what proteins to make and how to function. 🔗 Double helix structure 🧪 Base pairs: • A ↔ T • G ↔ C 🧬 Genetic code = sequence of bases ✍️ Transcription: DNA → RNA 🔁 Translation: RNA → Protein ➡️ DNA → RNA → Protein = LIFE This pathway is a foundation topic for biology, genetics, and nursing exams 💯 Save it, review it, master it ✨ ✍️ RN.Yasmeen 💙 #viral #fyp #trending #nclex #explore

⚠️Info: The number of potentially unique humans that could exist based on the human genome is astronomically large. If you treat each of the roughly 6 billion DNA base pairs as having four possible states, you get 4^(6 billion) possible genome combinations, a number so large it defies comprehension. Even more realistic estimates, which only consider known genetic variations, still yield about 2^(1.6 million) combinations, which is roughly 10^480,000, an unimaginably huge figure. This means that the vast majority of possible people will never exist. In that sense, we are extraordinarily fortunate to have been among those who get to live. And when our time comes to die, it is part of that same privilege, because so many possible lives never even begin. Comment 🙌 if you read the caption! Tag a friend who needs to see this!:) ————————————————————— 👉Follow @ourthirdimension 👈 👉Follow @ourthirdimension 👈 For content beyond this earth 🌍 ————————————————————— Credit @neildegrassetyson

DNA: Double stranded helix RNA: Single strand • DNA 🧬 (Deoxyribonucleic Acid): a single human chromosome contains millions of base pairs, stores all genetic information for an organism. • RNA (Ribonucleic Acid): much shorter, often only thousands of nucleotides, as it copies only a fraction of the DNA, carries out instructions from DNA, making proteins. #comparison #size #DNA #quiz #RNA

OCR A-Level Biology students - can you get full marks on this question on DNA replication? “Explain how the structure of DNA allows replication” - [5 marks] Scroll down for the model answer & mark scheme and find out! - - - - - - - - - - - - 1️⃣ DNA is double stranded 2️⃣ so, both strands can act as a template. 3️⃣ Hydrogen bonds between complementary bases are easy to break & reform 4️⃣ Complementary base pairing ensures correct sequence 5️⃣ e.g. Purine bases always pair to pyramidines 6️⃣ e.g 3 hydrogen bonds form between Cytosine and Guanine whilst 2 hydrogen bonds form between Adenine & Thymine Examiner Tips! 💡 *️⃣ Always use the term ‘complementary’ when discussing base pairs *️⃣ Give named examples to support your point - eg naming the number of hydrogen bonds between each base *️⃣ OCR regularly test on Purines & Pyrimidines so make sure you know which are which & how to identify them! (“Pure As Gold” - Purines AG & “Pyramids will CUT you” - Pyrimidines CUT) #biologytutor #alevelbiology #ocrbiology #ocralevelbiology #biologyrevision #dna #dnareplication #biologypastpapers #examtechnique #examstrategies #alevelrevision #year13revision #year12revision #studywithme #biologyhelp #ukeducation #scienceeducation #biostudent #biologyquestions #biologyskills #markschemespecific #biologyboost #biosheps #revisionreels #studenttips #parentsofgcseandalevel #alevelsupport #sixthformrevision #ucasprep #futuremedics