Question

what are key markers for the identification of bacteria?
○ peptidoglycan in cell membranes, ether - linked fatty acids, special transcription dna
○ special rna polymerase, peptidoglycan in cell walls, ester - linked fatty acids
○ cellulose in cell membranes, ester - linked lipids in cell walls, special transcription dna
○ special rna polymerase, peptidoglycan in cell membranes, chitin and cellulose cell walls

question 2 (multiple choice worth 3 points)
(06.01 mc)
according to the phylogenetic tree, which domains are more genetically related?
phylogenetic tree with bacteria, archaea, eukarya domains and their related organisms
○ eukarya and bacteria
○ eukarya and archaea
○ plants and animals
○ bacteria and archaea

Explanation:

First Question (Key markers for Bacteria identification)

To identify bacteria, we analyze each option:

• Bacteria have peptidoglycan in cell walls (not membranes), ester - linked fatty acids in cell membranes, and a special RNA polymerase. Let's check each option:
• Option 1: Peptidoglycan in cell membranes (wrong, it's in cell walls) and ether - linked fatty acids (archaea have ether - linked, not bacteria) and special transcription DNA (not a key marker for bacteria). So this is wrong.
• Option 2: Special RNA polymerase (bacteria have a distinct RNA polymerase), peptidoglycan in cell walls (correct for bacteria), ester - linked fatty acids (bacteria have ester - linked in cell membranes). This matches the key markers of bacteria.
• Option 3: Cellulose in cell membranes (bacteria don't have cellulose in cell membranes) and ester - linked lipids in cell walls (bacteria have peptidoglycan in cell walls) and special transcription DNA (not a key marker). Wrong.
• Option 4: Peptidoglycan in cell membranes (wrong) and chitin and cellulose cell walls (bacteria have peptidoglycan cell walls, not chitin/cellulose). Wrong.

From the phylogenetic tree, we can see the branching pattern. The tree shows that Eukarya and Archaea share a more recent common ancestor compared to Eukarya - Bacteria or Bacteria - Archaea. Plants and animals are both in Eukarya, but the question is about domains (Bacteria, Archaea, Eukarya).

• Option 1: Eukarya and Bacteria are less related as per the tree.
• Option 2: Eukarya and Archaea have a closer genetic relationship as seen from the tree's branching (the branches of Eukarya and Archaea are more closely connected).
• Option 3: Plants and animals are within Eukarya, but the question is about domains (Bacteria, Archaea, Eukarya), so this is not about domains.
• Option 4: Bacteria and Archaea are less related compared to Eukarya and Archaea.

Answer:

Special RNA polymerase, peptidoglycan in cell walls, ester - linked fatty acids (the second option)

Second Question (Phylogenetic tree - related domains)