Review Exercise # 47

PRACTICE QUESTIONS

Exercise # 47

Q1.The flagella movement is controlled by

a. Methylation and phosphorylation reactions

b. Oxidation and reduction reactions

c. Glycolysis and oxidative phosphorylation

d. Both b and c

e. None the above

Q2. Pili ( fimbriae) are

   a. They are more common in Gram –ive organisms

b. They are shorter than flagella

c. They are made of regularly arranged protein subunits called pilin and fimbrilin

d. They are of two types – common (attachment) and Sex (conjugate or F) pili.

e. All of the above

Q3. The cell wall of bacteria is composed of

a. N acetyl D glucosamine

b. D Iduronate

c. N acetyl muramic acid

d. A and C

e. B and C

Q4. The major difference between the cell walls of Gram +ve and –ive organism are

I.      Gram +ive has thin cell walls

II.    Gram +ive has thick cell walls and with teichoic acids ( glycerol and ribitol phosphodiesters)

III.  Gram -ve has thin cell walls and with no teichoic acids, and have LPS ( endotoxin)

a. I Only

b. III Only

c. I & II only

d. II & III only

e. All

Q5. LPS in Gram –ve bacteria has which of the following functions?

a. it is toxic and antigenic ( O antigen)

b. Blocks diffusion of LMW substances into the cells

c. It causes nonspecific inflammation including diarrhea, fever and septic shock

d. All of the above

  Q5. Which of the following are produced from Arginine?

I.      NO

II.    Urea

III.  Creatinine

a. I Only

b. III Only

c. I & II only

d. II & III only

e. All

Q6. Tryptophan is the precursor for

I.      Niacin

II.    Serotonin

III.  Melatonin

a. I Only

b. III Only

c. I & II only

d. II & III only

e. All

   

   Q7. Heme is formed from

I.      Succinyl choline + glycine

II.    Succinyl choline + aspartame

III.  Citrulline + glycine

a. I Only

b. III Only

c. I & II only

d. II & III only

e. All

Q8.Transposons are carried by

a. DNA

b. Plasmids

c. RNA

d. Bacteriophage

   

  Q9.Which of the following are not true?

I.      Autotrophs use organic compounds as main C source

II.    Heterotrophs use Co₂ as main C source

III.  Protrotrophs are parent cells that have no special nutritional requirements.

a. I Only

b. III Only

c. I & II only

d. II & III only

e. All

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