MCQs Botany-40 Posted on October 27, 2025December 3, 2025Author agropublishers 0 MCQs Botany-40 1. The central dogma of molecular biology describes the flow of genetic information as________ DNA → RNA → Protein Protein → DNA → RNA DNA → Protein → RNA RNA → DNA → Protein 2. Non-coding RNAs, such as microRNAs (miRNAs), can be considered part of epigenetic regulation because they___________ Directly repair DNA damage Code for histone proteins Are the primary components of chromatin Regulate gene expression at the post-transcriptional level without altering the DNA sequence 3. What term describes a large, naturally occurring community of plants and animals that occupy a specific habitat, such as a forest, desert, or ocean? Habitat Biome Niche Ecosystem 4. Roots are absent in _________ Angiosperms Pteridophytes Bryophytes Gymnosperms 5. In plants true roots first evolved among _________ Angiosperms Bryophytes Gymnosperms Pteridophytes 6. During photosynthesis, energy is converted from ___ energy into ___ energy, stored in the bonds of glucose Chemical; Chemical Mechanical; Light Kinetic; Chemical Light; Chemical 7. Which of the following nitrogenous bases is NOT found in DNA? Adenine Guanine Thymine Uracil 8. Oxygen generally composed of _______ of biomolecules in living organisms 40% 18% 65% 35% 9. What is the defining characteristic of imprinted genes? Their expression is determined by their parental origin, leading to monoallelic expression They are permanently inactivated in all cells of the body They have an exceptionally high rate of spontaneous mutation They code for the enzymatic machinery involved in epigenetic silencing 10. The regulation of the Calvin Cycle involves several key mechanisms. The light-activated enzyme Ferredoxin-Thioredoxin System (Fd-Trx system) reduces disulfide bridges on target enzymes. Which of the following enzymes is NOT activated by this reduction? Fructose-1,6-bisphosphatase (FBPase) Sedoheptulose-1,7-bisphosphatase (SBPase) Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) Phosphoribulokinase (PRK) Loading … Question 1 of 10
