ZOO505 Final Term MCQs

ZOO 505 Final Terms M.C.Q Fall 2020

1. _________has revolutionized the biological sciences as well especially in the fields of Health Sciences and Agricultural Sciences. Molecular Biology
2. Membranes are lipid–protein assemblies in which the components are held together in a thin sheet by __________bonds. Non-covalent
3. More than _____percent of the membrane’s carbohydrate is covalently linked to proteins to form glycoproteins. 90
4. For each ATP hydrolyzed, three sodium ions are pumped out as______ potassium ions are pumped in. Two
5. Intermediate filaments are a chemically heterogeneous group of structures that, in humans, are encoded by approximately _________ different genes. 70
6. An E. coli chromosome is estimated to have about ____________super-coiled loops. 400
7. Which one of the following is an important stabilizing force in the chromatin? Electrostatic force
8. Which process is the basic process that ensures the continuity of life? Cell division
9. Which model for DNA replication proposed that the two parental strands separate and that each then serves as a template for a new progeny strand? Watson–Crick
10. The new DNA strand directed by this template is known as ________________. Lagging strand
11. Number of Origin of replication is depends upon the ___________. Organism
12. The center sequence of central dogma____________. DNA-RNA-Protein
13. Bacteria have only a single RNA polymerase, whereas eukaryotic cells have ______RNA polymerases. Three
14. A ___________is the DNA sequence that initially binds to the RNA polymerase. Promoter
15. Non coding region in the mRNA is called_____________. Intron
16. The sequences called ____________trigger the elongating polymerase to dissociate from the DNA and release the

RNA chain. Terminators

17. There are 27 of these repeats in the yeast Pol II CTD, ______in the worm Caenorhabditis elegans, _____in the fly Drosophila, and ______ in humans. 32, 45, 52
18. Crystal structure of the head module of yeast Mediator reveals that it contains ______subunits. 7
19. Which one of the following is factors is required factors? SL1 and UBF
20. __________stimulating transcription from the core promoter by recruiting Pol I. SL1
21. Which one of the following is stop codon? UAA
22. ORF stands for_____________. Open frame reading
23. Transfer RNA accounts for some___________ of all cellular RNA. 10%
24. The _________is the binding site for the aminoacylated-tRNA. A-site
25. Common mechanism used by many proteins to stimulate ___________attack of carbonyl groups. Nucleophilic
26. _____________are removed during RNA maturation. Introns
27. RNA Polymerases function only in the presence of___________. DNA
28. The space in the active center cleft, which may be occupied either by region 1.1 or by DNA, is highly _________charged. Positively