BACTERIA MORPHOLOGY QUIZ

Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria

11%+ 0.22%

About 20%

50% or more

About 10%

TRUE ANSWER : ?
YOUR ANSWER : ?

Chemically the capsule may be

polypeptide

either (a) or (b)

polysaccharide

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Gram positive cells have a

multiple layer of peptidoglycan that helps to retain the crystal violet stain

periplasmic space that traps the crystal violet

second outer membrane that helps to retain the crystal violet stain

thick capsule that traps the crystal violet stain

TRUE ANSWER : ?
YOUR ANSWER : ?

The cell walls of many gram positive bacteria can be easily destroyed by the enzyme known as

lysozyme

pectinase

lipase

peroxidase

TRUE ANSWER : ?
YOUR ANSWER : ?

In eukaryotic cells, ribosomes are

Not specific

80S

70S

60S

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following may be most likely to be missing from a gram-positive bacterium?

Peptidoglycan

Phospholipid bilayer membrane

Lipopolysaccharide

Penicillin binding protein

TRUE ANSWER : ?
YOUR ANSWER : ?

The bacteria deficient in cell wall is

Klebsiella

Staphylococcus

Mycoplasma

Treponema

TRUE ANSWER : ?
YOUR ANSWER : ?

The next to last step in peptidoglycan biosynthesis is

linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain

synthesis of the NAM-peptide subunit

removal of the subunit from bactoprenol

cross-linking the peptide side chains of peptidoglycan

TRUE ANSWER : ?
YOUR ANSWER : ?

The other name for peptidoglycan is

murein

mucopeptide

none of these

both (a) & (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

The cell walls of Gram positive bacteria contain two modified sugar, viz. N- acetylgucosamine (NAG) and N- acetylmuramic acid (NAM). They are covalently linked by

α- 1,6-glycosidic bond

β-1,6-glycosidic bond

β- 1,4-glycosidic bond

α- 1,4-glycosidic bond

TRUE ANSWER : ?
YOUR ANSWER : ?