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