Microbiology - chapter 4

4. Diplococci' means an irregular cluster of spherical bacterial cells. True/False

False

How does the precise structure of the cell wall differ in gram positive and gram negative bacteria?

Gram positive cell walls consist of many layers of peptidoglycan while gram negative cell walls consist of one or few layers of peptidoglycan. Gram negative cell walls contain peptidoglycan in its periplasmic space and the space is much larger. They do not contain techoic acids in the wall like gram positive cell wall

8.If you observe rod-shaped pink cells after gram staining, you can assume that they are capable of producing endotoxins. T / F

True

13. A bacterial genus that has waxy Mycolic acid in the cell wall is: a) Mycobacterium b) Mycoplasma c) Corynbacterium Streptococcus

a) Mycobacterium

27. An example of glycocalyx is a) a capsule b) pili c) outer membrane d) a cell wall

a) a capsule

2. The major locomotor structure in the bacteria are: a) flagella b) pili c) fimbriae d) cilia

a) flagella

17. The site for ATP synthesis in most prokaryotes is: a) ribosomes b) mitochondria c) cell wall d) cell membrane

a) ribosomes

28. Two major structures that help bacteria adhering to surfaces are a) Flagella and pili b) Glycocalyx and fimbriae c) Fimbriae and flagella d) Lypopolysacharide and techoic acid e) Pili and ribosomes

b) Glycocalyx and fimbriae

16. Lipopolysaccharide is an important cell wall component of: a) Gram-positive b) Acid-fast bacteria c) Gram-negative d) Mycoplasma

c) Gram-negative

12. A conjugation pilus allows bacteria to: a) Attach to surfaces aiding in the formation of biofilms b) Move using a rotating motion c) Transfer genetic material d) Infect their host

c) Transfer genetic material

3. Spirochaets have a twisting locomotion due to presence of: a) Peritrichous flagella b) cilia c) periplasmic flagella d) fimbriae

c) periplasmic flagella

14. Metachromatic granules are concentrated crystals of: a) fat b) dipicholinic acid c) sulfur d) Phosphate

d) Phosphate

1. Which of the following is not found in all bacterial cells a) cell membrane b) nucleoid c) ribosomes d) actin cytoskeleton

d) actin cytoskeleton

20. Endospores are: a) metabolically inactive b) resistant to heat and chemical destruction c) resistant to freezing and radiation d) all of the above

d) all of the above

19. Chemical analysis of bacterial cell structure detects calcium-dipicholinic acid. Identify it. a) cell wall b) capsule c) slime layer d) endospore

d) endospore

15. All of the following pertain to endotoxins except a) are specific bacterial cell wall lipids b) can stimulate fever and shock in human body c) involved in typhoid and meningitis d) found in acid-fast bacterial cell wall

d) found in acid-fast bacterial cell wall

21. A bacterial arrangement in packets of eight cells is described as: a) micrococcus b) diplococcus c) tetrad d) sarcina

d) sarcina

9.True pili used for conjugation are only found on gram negative bacteria. T / F

true