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Chapter 22: Q. 15 (page 570)

The lipopolysaccharide layer (LPS) is a characteristic of the wall of ________.

a. archaean cells

b. Gram-negative bacteria

c. bacterial prokaryotic cells

d. eukaryotic cells

Short Answer

Expert verified

The lipopolysaccharide is the characteristic of the cell wall of gram-negative bacteria.

Step by step solution

01

Explanation

The prokaryotes-both bacteria and archaean contain the cell wall. The archaeal cell wall is made up of pseudopeptidoglycan while the bacterial cell wall is made up of a peptidoglycan layer. There are two groups of bacteria- gram-positive bacteria have the thick peptidoglycan layer with no outer lipopolysaccharide layer while gram-negative cell wall is made up of a thin peptidoglycan layer with an outer lipopolysaccharide layer. The eukaryotes like plants and fungi contain cell wall but it is made up of cellulose.

02

Final answer

Hence, the correct option is 'b'.

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Most popular questions from this chapter

Pseudopeptidoglycan is a characteristic of the walls of ________.

a. eukaryotic cells

b. bacterial prokaryotic cells

c. archaean prokaryotic cells

d. bacterial and archaean prokaryotic cell

Think about the conditions (temperature, light, pressure, and organic and inorganic materials) that you may find in a deep-sea hydrothermal vent. What type of prokaryotes, in terms of their metabolic needs (autotrophs, phototrophs, chemotrophs, etc.), would you expect to find there?

MRSA has emerged as a serious infectious disease, with the first case of methicillin-resistant S. aureus being detected in 1961. Why are medical professionals so concerned when antibiotics exist that can kill MRSA?

  1. MRSA can transfer methicillin-resistance to other bacteria.
  2. Patients are not treated with correct antibiotics rapidly enough to prevent serious illness.
  3. MRSA could acquire additional antibiotic resistance genes from other bacteria to become a “super bug.”
  4. All of the above.

Which of the following statements about the nitrogen cycle is false?

a. Nitrogen fixing bacteria exist on the root nodules of legumes and in the soil. b. Denitrifying bacteria convert nitrates (NO3 - ) into nitrogen gas (N2 ).

c. Ammonification is the process by which ammonium ion (NH4 + ) is released from decomposing organic compounds.

d. Nitrification is the process by which nitrites (NO2 - ) are converted to ammonium ion (NH4 + ).

Prokaryotes stain as Gram-positive or Gram-negative because of differences in the cell _______.

a. wall

b. cytoplasm

c. nucleus

d. chromosome
See all solutions

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