On what basis have bacteria traditionally been classified?

1. On what basis have bacteria traditionally been classified? • Shape of colony • Size of colony • Gram stain • All of the above

2. Gram-positive bacteria • appear purple after Gram staining • frequently cause diseases that cannot be cured by antibiotics • have a thicker layer of peptidoglycan • All of the above are true

3. Gram positive bacteria differ from Gram-negative bacteria in • their response to the Gram stain • their susceptibility to antibiotics • the make up of their cell walls • All of the above

4. One structure you would NOT find in a bacteria cell is a • cell wall  • Cell membrane • Mitochondria • chromosome

5. Bacteria cells have • a cell wall only • a cell membrane only • both a cell membrane and an outer wall • a cell wall inside of their cell membrane

6. The most commonly encountered bacteria are roughly spherical. The microbiological term describing this shape is • Coccus • Bacillus • spirilla

7. Another common bacterial shape is that of a rod, often called • Coccus • Bacillus • spirilla

8. In bacterial cells, ribosomes are packed into the cytoplasmic matrix and also loosely attached to the plasma membrane. What is the function of ribosomes? • Site of energy production • Site of protein synthesis • Contains the genetic material • Lets things in and out of the cell

9. Which of the following statements regarding bacterial DNA is true • Bacteria only possess 4 chromosomes • It is a single circular loop • It contains histone proteins • It is only single stranded

10. Petri dishes are incubated in an inverted position in order to prevent • condensed moisture from dropping onto the colonies, thus contaminating them directly. • The agar from drying out. • the colonies from sinking into the medium. • The bacteria from over-heating.

11. Cloudiness is a sign that bacteria have grown in a _______________ after inoculation and incubation. • streak plate • tube of nutrient broth • Gram stain • Simple stain

12. The optimum temperature for incubating an organism is the one at which • it grows with the shortest generation time • it has the longest time between cell divisions • it is near one extreme of its range of tolerated temperatures • its enzymes begin to denature

13. The stage of bacteria growth where death and growth are equal • Lag • Log • Stationary • death

14. E.Coli bacteria are • Gram-negative cocci • Gram negative baccili • Gram positive cocci • Gram positive baccili

15. The process in which the chromosomes of a bacteria replicates and the cell divides is called • Transduction • Binary fission • Conjugation • Meiosis

16. Prokaryotes are unlike all other organisms in that their cells • Lack nuclei • Have cell walls • Have organelles • Lack nucleic acids

17. Which statement is true about bacteria? • Bacteria are living organisms that consist of one cell. • Bacteria are the smallest of all living things. • Bacteria are the oldest and most diverse life forms. • All three statements are true.

18. There are three common shapes of bacteria. They are • rods, spheres, and spirals. • rods, spirals, and tubes. • spheres, hexagons, and spirals. • none of the above.

19. What has caused some bacteria to become drug-resistant? • the misuse of antibiotics to try and cure viral infections like the common cold • that 50 percent of all antibiotics end up in animal feed, creating super bacteria • both 1 and 2 • none of the above

20. When streaking a plate, the loop should be flamed • At the beginning and end • At the beginning and end and between the first 2 quadrants • At the beginning and end and between the second and third quadrants • At the beginning and end and between each quadrant