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________ RNA → DNA → Protein DNA → RNA → Protein Protein → DNA → RNA DNA → Protein → RNA 2. Which of the following nitrogenous bases is NOT found in DNA? Adenine Thymine Guanine Uracil 3. Roots are absent in _________ Bryophytes Gymnosperms Angiosperms Pteridophytes 4. In plants true roots first evolved among _________ Bryophytes Pteridophytes Angiosperms Gymnosperms 5. Oxygen generally composed of _______ of biomolecules in living organisms 18% 65% 35% 40% 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? Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) Fructose-1,6-bisphosphatase (FBPase) Sedoheptulose-1,7-bisphosphatase (SBPase) Phosphoribulokinase (PRK) 7. During photosynthesis, energy is converted from ___ energy into ___ energy, stored in the bonds of glucose Light; Chemical Kinetic; Chemical Mechanical; Light Chemical; Chemical 8. 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 Are the primary components of chromatin Directly repair DNA damage Code for histone proteins 9. What term describes a large, naturally occurring community of plants and animals that occupy a specific habitat, such as a forest, desert, or ocean? Ecosystem Biome Habitat Niche 10. What is the defining characteristic of imprinted genes? They code for the enzymatic machinery involved in epigenetic silencing They are permanently inactivated in all cells of the body They have an exceptionally high rate of spontaneous mutation Their expression is determined by their parental origin, leading to monoallelic expression Loading … Question 1 of 10
