MCQs Botany [40] Posted on October 27, 2025Author agropublishers 0 1. The central dogma of molecular biology describes the flow of genetic information as________ RNA → DNA → Protein DNA → Protein → RNA Protein → DNA → RNA DNA → RNA → Protein 2. 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 Biome Ecosystem Habitat 3. Non-coding RNAs, such as microRNAs (miRNAs), can be considered part of epigenetic regulation because they___________ Are the primary components of chromatin Regulate gene expression at the post-transcriptional level without altering the DNA sequence Code for histone proteins Directly repair DNA damage 4. Roots are absent in _________ Bryophytes Angiosperms Gymnosperms Pteridophytes 5. During photosynthesis, energy is converted from ___ energy into ___ energy, stored in the bonds of glucose Mechanical; Light Light; Chemical Chemical; Chemical Kinetic; Chemical 6. 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) 7. What is the defining characteristic of imprinted genes? 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 They have an exceptionally high rate of spontaneous mutation 8. Oxygen generally composed of _______ of biomolecules in living organisms 65% 35% 40% 18% 9. Which of the following nitrogenous bases is NOT found in DNA? Adenine Uracil Guanine Thymine 10. In plants true roots first evolved among _________ Gymnosperms Bryophytes Angiosperms Pteridophytes Loading … Question 1 of 10
