1. The three domains of life are a. eukaryotes, prokaryotes, and viruses. b. ani

Question

1. The three domains of life are a. eukaryotes, prokaryotes, and viruses. b. animals, plants, and microorganisms. c. Prokaryota, Eukaryota, and Protoctista. d. Archaebacteria, Eubacteria, and Eukaryota. e. Archaea, Bacteria, and Eukarya. 2. DNA in prokaryotes is found in a. the nucleoid b. the nucleolus. c. plasmids d. the nucleoid and plasmids. e. the nucleolus and plasmids. 3. The major structural component of bacterial cell walls is cellulose. b. chitin. c. proteoglycan d. peptidoglycan. e. arabinogalactan. 4. A Gram-positive bacterium is characterized by the a. presence of a thin cell wall. b. presence of a thick cell wall. c. absence of a cell wall. d. presence of an outer membrane. e. absence of ribosomes. 5. Which of the following includes the purple nonsulfur bacteria? a. chemoautotroph b. chemoheterotroph c. photoautotroph d. photoheterotroph e. chemoautotroph and photoheterotroph 6. Which of the following includes the cyanobacteria? a. chemoautotroph b. chemoheterotroph c. photoautotroph d. photoheterotroph e. chemoautotroph and photoheterotroph

Explanation / Answer

Answers :

Q1. The correct option is E (archaea, bacteria and Eukarya)

Q2. The correct answer is D (Nucleoid and plasmids).

Nucleoid : In bacteria, nuclear material is concentrated in a specific clear region of the cytoplasm called Nucleoid.

Plasmids : Plasmids are double stranded, covalently closed, autonomously replicating, extrachromosomal DNA molecules present in most of the bacteria genera.

Q3. The correct answer is D (Peptidoglycan)

Explanation : Peptidoglycan (murein), is a component of eubacterial cell walls that forms the mesh like structure around the cell. It is made up of a polysaccharide backbone consisting of alternating N- Acetylmuramic acid (NAM) and N-acetylglucosamine (NAG) residues Linked by beta 1-4 Glycosidic Bonds.

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