Bacteria Morphology

Q1: The structure responsible for motility of bacteria is

A pilli

B flagella

C sheath

D capsules

Q2: Genetic system is located in the prokaryotes in

A nucleoid

B chromatin

C nuclear material

D all of these

Q3: Chemotaxis is a phenomenon of

A swimming away of bacteria

B swimming towards a bacteria

C swimming away or towards of bacteria in presence of chemical compound

D none of the above

Q4: Cyanobacteria have

A a gram-positive cell wall

B a gram-negative cell wall

C Neither (a) nor (b)

D No cell wall

Q5: Which of the following does not contain protein?

A Pili

B Flagellum

C Lipoteichoic acid

D Porin

Q6: The last step in synthesis of peptidoglycan is

A attachment of a peptide to muramic acid

B attaching two amino acids to form a cross-link

C attachment of a portion of peptidoglycan to a membrane lipid

D binding of penicillin to a membrane protein

Q7: Which of the following may be most likely to be missing from a gram-positive bacterium?

A Penicillin binding protein

B Peptidoglycan

C Lipopolysaccharide

D Phospholipid bilayer membrane

Q8: Microcapsules are composed of

A proteins

B polysaccharides

C lipids

D all of these

Q9: The common word for bacteria which are helically curved rods is

A cooci

B pleomorphic

C bacillus

D spirilla

Q10: The other name for peptidoglycan is

A mucopeptide

B murein

C both (a) & (b)

D none of these

Q11: Which of the following is analogous to mesosomes of bacteria?

A Mitochondria of eukaryotes

B Golgi apparatus of eukaryotes

C Lysosomes of eukaryotes

D None of these

Q12: Swimming towards a chemical of bacteria is termed as

A positive chemotaxis

B negative chemotaxis

C phototaxis

D magnetotaxis

Q13: Which of the following may contain fimbriae?

A Gram-positive bacteria

B Gram-negative bacteria

C Both (a) and (b)

D None of these

Q14: 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

A α- 1,4-glycosidic bond

B β-1,6-glycosidic bond

C α- 1,6-glycosidic bond

D β- 1,4-glycosidic bond

Q15: Periplasm is

A the area between the inner and outer membranes of gram-negative bacteria

B the area between the inner and outer membranes of Gram-positive bacteria

C the interior portion of mitochondria

D the area outside the cell membrane that is influenced by the polymers

Q16: Which of the following bacterial genera (that produces endospore) have medical importance?

A Clostridium

B Bacillus

C Both (a) and (b)

D None of these

Q17: A cluster of polar flagella is called

A lophotrichous

B amphitrichous

C monotrichous

D petritrichous

Q18: Peptidoglycan is found only in the bacterial

A cell membrane

B glycocalyx

C cell wall

D spore

Q19: Cytoplasmic inclusions include

A ribosomes

B mesosomes

C fat globules

D all of these

Q20: The bacteria deficient in cell wall is

A Treponema

B Mycoplasma

C Staphylococcus

D Klebsiella

Q21: The common word for bacteria which are spherical in shape is

A cocci

B bacilli

C spirilla

D pleomorphic

Q22: Gram positive cells have a

A second outer membrane that helps to retain the crystal violet stain

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

C thick capsule that traps the crystal violet stain

D periplasmic space that traps the crystal violet

Q23: Which of the following is not true about peptidoglycan?

A It is a polymer consisting of N-acetyl glucosamine, N-acetyl muramic acid and amino acids (alanine, lysine, etc.)

B It is present in prokaryotic cell wall

C It occurs in the form of a bag shaped macro molecule surrounding the cytoplasm membrane

D None of the above

Q24: The next to last step in peptidoglycan biosynthesis is

A synthesis of the NAM-peptide subunit

B removal of the subunit from bactoprenol

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

D cross-linking the peptide side chains of peptidoglycan

Q25: The location where the bacterial chromosome concentrates is called

A nucleus

B nuclein

C nucleoid

D nucleose

Q26: Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria

A 50% or more

B About 10%

C 11%+ 0.22%

D About 20%

Q27: The cell wall of

A gram-positive bacteria are thicker than gram-negative bacteria

B gram-negative bacteria are thicker than gram-positive bacteria

C both have same thickness but composition is different

D none of these

Q28: Which of the following organism has sterols in their cytoplasmic membrane?

A Clostridum

B Proteus

C Mycoplasma

D Bacillius

Q29: The arrangement, in which flagella are distributed all round the bacterial cell, is known as

A lophotrichous

B amphitrichous

C peritrichous

D monotrichous

Q30: In which of the following, lipo-polysaccharide is a major constituent of outer membrane of the cellwall?

A Gram-positive bacteria

B Gram-negative bacteria

C Fungi

D None of these

Q31: Which is most likely to be exposed on the surface of a gram-negative bacterium?

A Pore protein (porin)

B Protein involved in energy generation

C Lipoteichoic acid

D Phospholipids

Q32: A single polar flagella is known as

A monotrichous

B lophotrichous

C amphitrichous

D none of these

Q33: The protein from which hook and filaments of flagella are composed of, is

A keratin

B flagellin

C gelatin

D casein

Q34: Which of the following structure(s) is /are external to cell wall?

A Flagella

B Stalks

C Sheath

D All of these

Q35: Which of the following is true about cell wall of gram-positive bacteria?

A It consists of multiple layers

B It is thicker than that associated with gram-negative bacteria

C It contains teichoic acids

D All of these

Q36: Teichoic acids are typically found in

A cell walls of gram positive bacteria

B outer membranes of gram positive bacteria

C cell walls of gram negative bacteria

D outer membranes of gram negative bacteria

Q37: The cell walls of many gram positive bacteria can be easily destroyed by the enzyme known as

A lipase

B lysozyme

C pectinase

D peroxidase

Q38: Bacteria having no flagella are unable to

A move

B reproduce

C stick to tissue surfaces

D grow in nutrient agar

Q39: The common word for bacteria which are straight rod in shape is

A cooci

B bacilli

C spirilla

D pleomorphic

Q40: Porins are located in

A the outer membrane of gram-negative bacteria

B the peptidoglycan layer of gram-positive bacteria

C the cytoplasmic membrane of both gram-negative and gram-positive bacteria

D the periplasmic space of gram-negative bacteria

Q41: Which of the following is exposed on the outer surface of a gram-negative bacterium?

A O-antigen of lipopolysaccharide (LPS)

B Polysaccharide portion of lipoteichoic acid (LTA)

C Braun lipoprotein

D Electron transport system components

Q42: Which of the following has Chinese letter arrangement?

A Bacillus anthracis

B Mycobacterium tuberculosis

C Clostridium tetani

D Corynebacterium diphtheriae

Q43: Chemically the capsule may be

A polypeptide

B polysaccharide

C either (a) or (b)

D none of these

Q44: Single or clusters of flagella at both poles is known as

A monotrichous

B petritrichous

C amphitrichous

D none of these

Q45: The cocci which forms a chain is

A Streptococci

B diplococci

C Staphylococci

D Tetracocci

Q46: Which of the following has peptidoglycan as a major constituent of cell wall?

A Gram-negative bacteria

B Gram-positive bacteria

C Fungi

D None of these

Q47: The cooci which mostly occur in single or pairs are

A Streptococci

B Diplococci

C Tetracocci

D None of these

Q48: Flagella move the cell by

A many flagella beating in a synchronous, whip-like motion

B an individual flagellum beating in a whip-like motion

C spinning like a propeller

D attaching to nearby particles and contracting

Q49: In eukaryotic cells, ribosomes are

A 70S

B 60S

C 80S

D Not specific

Q50: Name the component of flagellum.

A Filament

B Hook

C Basal body

D All of these

Q51: The cocci which forms a bunch and irregular pattern are

A Staphylococci

B diplococci

C Tetracocci

D Streptococci

Q52: Peptidoglycan is also known as

A N-acetyl muramic acid

B murein mucopeptide

C N acetylglucosamine

D mesodiaminopimetic acid

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