Endotoxin is part of which component

单选题 Endotoxin is part of which component of Gram-negative bacteria?

A、 Lipopolysaccharide (LPS)

B、 Lipoprotein

C、 Lipid bilayer

D、 Peptidoglycan

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单选题 Which structure is uniquely essential in bacteria compared to animal cells?

A、Ribosome

B、Mitochondrion

C、Golgi apparatus

D、Cell wall

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单选题 Which statement about microorganisms is true?

A、Bacteria are eukaryotic

B、Viruses contain ribosomes

C、Fungi are eukaryotic

D、Antibiotics treat all microbial diseases

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单选题 Which statement about acellular microorganisms is INCORRECT?

A、They are the smallest filterable microorganisms

B、They lack a typical cellular structure

C、They possess no energy-producing enzyme system

D、They contain both DNA and RNA

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单选题 Which factor is most important to maintain intrinsic bacterial morphology?

A、Cellular membrane

B、Ribosome

C、Cell wall

D、Chromosome

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单选题 Which characteristic is NOT true of prokaryotic microorganisms?

A、Organelles are rudimentary (only ribosomes present)

B、All possess a cell wall

C、No nucleus (only a nucleoid region)

D、Rickettsia is an obligate intracellular parasite

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单选题 What is the primary component shared by both Gram-positive and Gram-negative bacterial cell walls?

A、Teichoic acid

B、Lipopolysaccharide

C、Peptidoglycan

D、Outer membrane

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单选题 Which prokaryotic microorganism lacks a cell wall?

A、Mycoplasma

B、Chlamydia

C、Staphylococcus

D、Rickettsia

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单选题 Which structure is NOT essential for bacterial survival?

A、Cell wall

B、Cell membrane

C、Ribosome

D、Plasmids

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