MCQs Plant Breeding and Genetics-43 Posted on 2025-11-03Author admin 0 1. Which of the following nitrogenous bases is NOT found in DNA? Adenine Uracil Thymine Guanine 2. ___________ is the ability of an organism to produce different phenotypes in response to different environmental conditions Dependence on external chemicals Inability to sense the environment None of these Phenotypic plasticity 3. In plants true roots first evolved among _________ Bryophytes Pteridophytes Angiosperms Gymnosperms 4. 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 5. CGIAR Genebank at _____________ is primarily responsible for conserving the world’s largest collection of rice germplasm ICARDA, Lebanon CIMMYT, Mexico IRRI, Philippines CIP, Peru 6. 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 7. Primary function of pollen is to _______ Protect the embryo Produce sperm cells Produce female gametes Facilitate fertilization 8. During photosynthesis, energy is converted from ___ energy into ___ energy, stored in the bonds of glucose Light; Chemical Mechanical; Light Kinetic; Chemical Chemical; Chemical 9. The central dogma of molecular biology describes the flow of genetic information as_________- Protein → DNA → RNA DNA → RNA → Protein DNA → Protein → RNA RNA → DNA → Protein 10. The primary product of photolysis in light reactions is _________ NADPH ATP Oxygen Glucose Loading …
