48. Evaluate the following two statements All bacterial cells have a cell wall.

Question

48. Evaluate the following two statements All bacterial cells have a cell wall. All cells of all types have plasma membranes a) True /True b) True/False c) False /True d) False/False 49. Ciliates are an example of and are classified by their type of a) animal-like protists / movement b) plant like protists/ photosynthetic pigment c) fungus-like protists/ movement d) bacteria / cell wall 50. You look at a bacterial sample under the microscope after a Gram stain and observe pink spheres that are linked together in long chains. You can conclude that these cells are a) Gram negative streptococci b) Gram-positive streptococci c) Gram-negative streptobaci d) Gram positive staphylococci e) Gram-negative staphylococc Which of the following structures are found in eukaryotes but not in prokaryotes? a) Flagella b) Ribosomes c) Plasma membranes d) Organelles 51. 52. HIV is a human pathogen that infects helper T cells, causing them to die. What would you expect would happen to an individual's immune system after infection with HIV? a) The individual would have compromised innate immunity b) The individual would have no immune function at all c) The individual would have fewer activated cytotoxic T-cells and B-cells d) The individual would become unable to display exogenous antigens using MHC For the following 5 questions, fill in the blank with the name of the process that best fits the sentence, and bubble in the corresponding letter on your Scantron. A. Ammonification B. Nitrogen fixation C. Denitrification D. Nitrification is a process that can be carried out either by cyanobacteria or Rhizobium species that are associated with plants. 54. 55. The process that converts ammonia into nitrate is called 56. Nitrogenase is the enzyme involved in 57. The conversion of organic nitrogen to ammonia is called is the process that converts nitrate into atmospheric nitrogen gas. Page 9

Explanation / Answer

Ans 48 :c) False /true

Not all the bacterias have cell wall. Some genus of bacteria lack cell wall such as mycoplasms , due to which they are unaffected by the antibiotics that target the cell wall synthesis. All the cells have plasma membrane that protect the interior of the cell from the surroundings.

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