Multi-antibiotic (drug) resistant Clostridium difficile (C.diff) is a species of bacteria, which can form endospores in response to adverse environmental conditions - Leaving Cert Biology - Question 14(c) - 2020
Question 14(c)
Multi-antibiotic (drug) resistant Clostridium difficile (C.diff) is a species of bacteria, which can form endospores in response to adverse environmental conditions.... show full transcript
Worked Solution & Example Answer:Multi-antibiotic (drug) resistant Clostridium difficile (C.diff) is a species of bacteria, which can form endospores in response to adverse environmental conditions - Leaving Cert Biology - Question 14(c) - 2020
Step 1
Draw a large labeled diagram of a typical bacterial cell.
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Answer
To draw a typical bacterial cell, include the following parts:
Cell Wall: A rigid structure that maintains the shape of the cell.
Cell Membrane: A semi-permeable membrane that controls the movement of substances in and out of the cell.
Cytoplasm: The gel-like substance within the cell where metabolic processes occur.
Nucleic Acid (DNA): Free-floating DNA that carries genetic information, often in the shape of a circular strand.
Plasmid: Smaller DNA molecules that can replicate independently, often containing genes for antibiotic resistance.
Flagella/Capsule/Slime Layer: Optional structures that aid in movement or protection.
Step 2
Name the method of asexual reproduction exhibited by bacteria.
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The method of asexual reproduction exhibited by bacteria is binary fission.
Step 3
Describe the process of this asexual reproduction in bacteria.
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In binary fission, the process begins with the replication of the bacterial DNA. Once the DNA is copied, the cell elongates, and the cell walls begin to grow inward, dividing the cell into two halves. Eventually, the cell membrane pinches off, resulting in two genetically identical daughter cells.
Step 4
Name each of the stages of the growth curve labelled A, B and C.
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Stage A: Lag Phase
Stage B: Log Phase
Stage C: Stationary Phase
Step 5
What is a suitable label for axis Y?
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A suitable label for axis Y would be Population or Number of Micro-organisms.
Step 6
Indicate on your diagram when endospore formation is most likely to occur.
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Endospore formation is most likely to occur during the Stationary Phase of the growth curve, specifically when resources become scarce and conditions are unfavorable.
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