DAT-2000 Questions with Complete Solutions 2023/2024

DAT-2000 Questions with Complete Solutions 2023/2024 1. # electrons in SUB SHELL - CORRECT ANSWER 4l + 2 2. # electrons per shell - CORRECT ANSWER 2n2 3. # orbitals per shell - CORRECT ANSWER n2 4. 1amu - CORRECT ANSWER 1amu=1g/mol Carbon weighs 12 g/mole= 12 amu 5. 2 Chambered Hearts - CORRECT ANSWER Fish 6. 2^n - CORRECT ANSWER how many stereoisomers can a molecule have with n chiral centers 7. 3Chambered Heart - CORRECT ANSWER Frogs and amphibians 8. 4 Chambered Heart - CORRECT ANSWER Mammals and bird 9. 5 classes of immunoglobins - CORRECT ANSWER IgD,A,M,E,G antibodies 10. a 9:3:3:1 phenotypic ratio is characteristic of what generation of a dihybrid cross?: - CORRECT ANSWER F2 generation 11. A band: covers the entire thick filament 12. A change in the gene pool due to chance is termed? - CORRECT ANSWER genetic drift. 13. a circus lion learns to stand up on a chair and jump through a hoop to receive a tasty treat. this is an example of? - CORRECT ANSWER operant conditioning 14. a complex behavioral response to a specific cue or releaser, which is exhibited by all members of the species as a stereotyped response to the same stimulus is known as a? - CORRECT ANSWER fixed action pattern 15. a fertilized egg is called ? which is haploid. - CORRECT ANSWER zygote 16. a form of asexual reproduction found in females, where growth and development of embryos occurs without fertilization by a male? - CORRECT ANSWER parthenogenesis 17. a genetic map involves using? - CORRECT ANSWER crossover frequencies. 18. a hollow ball of cells is called a ? - CORRECT ANSWER blastula 19. a multicelled organism that contains tentacles with specialized stinging cells called nematocysts. - CORRECT ANSWER hydra 20. a nucleotide is different from a nucleoside. What two components make up a nucleoside? give an example of a nucleoside? - CORRECT ANSWER sugar and a base. ATP is a nucleoside. Where as a nucleotide is made up from base, phosphate and sugar. 21. a pH gradient is seen during which cellular respiration process? - CORRECT ANSWER ETC 22. A planaria is a flatworm and contains both male and female? - CORRECT ANSWER reproductive structures 23. a process in which embryonic tissues influence adjacent tissues to differentiate is called? - CORRECT ANSWER embryonic induction 24. a protein of 210 amino acids is made from how many DNA nucleotides?: 630 25. a repressor which binds to the operator region in a operon can be deactivated by what? - CORRECT ANSWER inducer which binds to the binding site of the repressor. by doing so it acts as an allosteric effector altering the shape. 26. a series of mitotic cell divisions that follow fertilization is called? - CORRECT ANSWER cleavage. 27. A single gene sometimes affects many traits in an organism. A single gene may exert effects on several different phenotypic characteristics - CORRECT ANSWER pleitrophy 28. a sperm cell comes in contact with the jelly coat surrounding an egg cell known as the? - CORRECT ANSWER zona pellucida 29. a sperm cell is unable to fertilize oocytes upon immediate ejaculation, which process must occur first? This process is a functional maturation of the spermatozoa. The physiological changes that occur in the spermatozoa. These changes include changes in sperm intracellular ion [ ], motility, and metabolism. - CORRECT ANSWER capacitation 30. a suitable vector for recombinant DNA cloning can be? - CORRECT ANSWER bacteriophage and plasmids 31. a surgical bone repair is termed?: osteoplasty 32. a technique used to clone animals is called? - CORRECT ANSWER Somatic cell nuclear transfer 33. A the degree of unsaturation of a cell membrane increases, what happens to it fluidity? - CORRECT ANSWER the fluidity increases with the degree of unsaturation 34. a virus that infects a bacteria is called? - CORRECT ANSWER bacteriophage. 35. ABO blood types - CORRECT ANSWER erythrocytes have characteristic cell surface proteins that can be considered antigens; blood type A has antigen A so it produces anti-B antibodies; blood type B has antigen B so it produces anti-A antibodies; blood type O has no antigens so produces anti-A and anti-B antibodies (universal donor); blood type AB has both antigens and is the universal recipient 36. Abscisic acid - CORRECT ANSWER inhibitor of plant growth hormones 37. absolute configuration - CORRECT ANSWER describes the exact spatial arrangement of groups of atoms independent of other molecules. 38. acetaldehyde: name for ethanal