17. Cnidarians have surface cells called choanocytes that contain prey capturing

Question

17. Cnidarians have surface cells called choanocytes that contain prey capturing structures known as nematocycts 18. Th e coelom of most deuterostomes develops from outpocketings of the endoderm of the gut. 19. Torsion is a unique characteristic of all mollusks. 20. Fishes may rely on their lungs for buoyancy 21. Sessile animals are often filter feeders 22. Fruits are expanded anthers 23. During double fertilization, one sperm nucleus unites with the micropspore mother cell. 24. Coenocytic fungi have many nuclei in one extensive cytoplasm. 25. Segmentation allowed the development of specialized appendages. 26. Animals that have nerves always have brains. 27. Mollusks have closed circulatory systems 28. You could kill a starfish by cutting off its arms 29. Reptiles never have gill slits. 30. The heart of an adult amphibian has three chambers. 31. Phloem transports organic nutrients from leaves to roots 32. Sieve tube members are found in xylem. 33. Tracheids are a type of cell in phloem. 34. Xylem transports water from roots to leaves. 35. Sponges have three tissue layers 36. Most higher plants have a minute diploid phase. 37. Many fungi depend on plants for mineral absorption. 38. If a lichen were sprayed with a chemical that blocked photosynthesis, it would probably die. 39. The insects include more species than any other group. 40. Poikilotherms are unable to produce body heat. 41. Leaves are broad and thin to minimize their absorption of oxygen. 42. Water can hold more oxygen than air can. 43. Book lungs are found in crustaceans and mollusks, while external feathery gills are found in arachinids. 44. Saprobes parasitize plants. 45. In coelomates, but not in pseudocoelomates, a peritoneum completely lines the coelomic cavity 46. Trypanosomes possess a kinetoplast ( a mass of mitochondrial DNA close to the nucleus 47. Psychrophiles live in extremely hot conditions9Above 100°c 48. Spirogyra is a plant protist 49. Shigella spp is a bacteria that causes dysentery 50. Anthrax is a bacteria that can be used in terrorism.

Explanation / Answer

17) False

18) False

19) True

20) False

21) True

22) False

23) False

24) True

25) True

26) False

27) False

28) False

29) False

30) True

31) True

32) False

33) False

34) True

35) False

36) False

37) False

38) False

39) True

40) True

41) False

42) True

43) False

44) False

45) True

46) True

47) False

48) True

49) True

50) True

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