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#genetics MCQ

6 public questions tagged with this topic.

BOTANY

Which of the following codons serves as the start codon in most organisms?

AUG is the start codon, coding for methionine, and serves as the initiation signal for translation. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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Membrane Transportation

Which of the following mutations leads to cystic fibrosis?

Cystic fibrosis is autosomal recessive disorder due to CFTR ABCC7 mutations at chromosome 7q31.2 with more than 2000 variants catalogued in CFTR2 database. F508del deletion of phenylalanine 508 in NBD1 causes misfolding, endoplasmic reticulum retention, proteasomal degradation and minimal surface expression, representing class II trafficking defect. G551D missense in NBD1 signature motif impairs ATP-dependent gating though protein reaches membrane, class III gating defect. R117H in transmembrane domain reduces conductance, class IV. G542X nonsense truncates protein, class I no synthesis. Compo

Ref: Cutting, Nat Rev Genet 2015, Cystic fibrosis genetics; CFTR2 database, cff.org.

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ABC MODEL+PYQS

Homeotic genes mainly encode:

Go with C — Transcription factors. Under ABC MODEL, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Structural proteins; B) Enzymes; D) Hormones. When two options sound similar, choose the one that matches the textbook definition most tightly.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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