Chapter 23 Prokaryotes and Viruses

Which of the following statements show characteristics of Archaebacteria?

I. The cell walls do not contain peptidoglycan.

II. There are no membrane-enclosed organelles within their cytoplasm.

III. Their DNA consist of histone proteins.

IV. Their membrane lipid has unbranched hydrocarbon chain.

• I, II and III

• II, III and IV

• I, II and IV

• I, III and IV

Which compound in the cell wall that causes a Gram positive bacteria stain purple in colour when it is treated with crystal violet dye?

• Cellulose

• Lipoprotein

• Peptidoglycan

• Lipopolysaccharide

Cyanobacteria are

• Photoheterotrophs

• Photoautotrophs

• Chemoautotrophs

• Chemoheterotrophs

Which of the following statements are TRUE about organisms in the Domain Bacteria?

I. Consist of bacteria and cyanobacteria

II. Some are photoautotrophs

III. Genetic material is a single stranded DNA

IV. Organelles are not present

• I and II

• I, II and III

• I, II and IV

• I, II, III and IV

All answers listed below are true about bacteria except

• all are prokaryotes

• all are harmful

• all are unicellular

• they do not have nucleus

What material is found in most bacterial cell walls?

• Cellulose

• Chitin

• Peptidoglycan

• Amylose

A rod-shaped bacteria is called

• spiral

• bacillus

• coccus

• vibrio

The Gram-positive bacteria stain purple because

• they form endospore

• they have cellulose layer

• they have thin peptidoglycan layer

• they have thick peptidoglycan layer

Prokaryotes are differentiated from eukaryotes by

• lacking of true nucleus and cytoskeleton

• lacking of membrane bounded organelle

• the flagella do not show 9+2 microtubule arrangement

• All choices are true.

Which domain has cell wall containing peptidoglycan?

• Bacteria

• Archaea

• Eukarya