23. Prokaryotic cells have DNA, but it is contained within a nucleus with a nucl

Question

23. Prokaryotic cells have DNA, but it is contained within a nucleus with a nuclear envelope nucleoid which has no nuclear envelope A) B) C) D) E) ribosome fimbriae 24. Bacteria that are unable to grow in the presence of oxygen are A) B) facultative anaerobes obligate anaerobes C) acrobic D mutualistic E) saprotroph 25. Bacteria have short, fine, hairlike appendages called A) B) C) D) mesosomes plasmids flagella spirilla E) fimbriac 26. Archaca include A) B) C) D) gram-positive, gram-negative and wall-less bacteria methanogens, halophiles and thermoacidophiles mutualistic, parasitic obligate and facultative anaerobes and commensalistic bacteria 27. Obligate anaerobes can only grow in the presence of oxygen. A) B) True False 28. Bacteria occur in which basic shape(s)? A) rod B) spherical C) spiral D) al of the above E) spherical, cuboidal and columnar 29. Amoeboids often have no definite shape and move and engulf prey by a cytoplasn extension called a A) food vacuoles B) contractile vacuoles C) trypanosome D) pseudopod E) trichocyst 30. Which one of the following statements about the Gram stain is false?

Explanation / Answer

Answers

23. (B) Nucleoid which has no nuclear envelop

24. (B) Obligate anaerobes

25. (E) Fimbriae

26. (B) Methenogens , halophiles and thermoacidophiles

27. (B) False

28. (D) All of the above

29. (D) Pseudopod

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