Biology: Bacteria Resistance to Chemical
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Questions and Answers

What principle of evolution best explains why some bacteria survived after exposure to a chemical that killed most of the population?

  • Gene flow
  • Sexual selection
  • Natural selection (correct)
  • Genetic drift

Which process allows some bacteria to survive when exposed to harmful chemicals?

  • Random mating
  • Inheritance of acquired characteristics
  • Symbiotic relationship
  • Possessing genetic variation (correct)

Which of the following is a direct result of the presence of genetic variation within a bacterial population?

  • Bacteria form a biofilm to protect themselves
  • Some bacteria are resistant to the chemical (correct)
  • The chemical mutates the bacterial DNA
  • All bacteria die when exposed to a new chemical

Why is it incorrect to say that bacteria change their DNA sequence in response to exposure to a chemical?

<p>Changes in DNA sequence are random, not a response to the environment (A)</p> Signup and view all the answers

What is the most likely outcome for bacteria that do not possess a genetic variation providing resistance to a harmful chemical?

<p>They are likely to die (B)</p> Signup and view all the answers

Which factor most likely contributed to the survival of some bacteria after chemical exposure?

<p>The bacteria possessed a genetic variation that provided resistance to the chemical (A)</p> Signup and view all the answers

What is a likely reason why most bacteria died upon exposure to a chemical?

<p>They had no genetic traits providing resistance to the chemical (B)</p> Signup and view all the answers

How can genetic variation within a bacterial population influence survival in toxic environments?

<p>It can lead to some bacteria having resistance to harmful chemicals (A)</p> Signup and view all the answers

Why is it unlikely that bacteria changed their DNA sequences in response to chemical exposure?

<p>DNA sequence changes occur randomly, not as a direct response to environmental changes (C)</p> Signup and view all the answers

What is the primary reason for the survival of some bacteria despite exposure to a lethal chemical?

<p>They carried a pre-existing genetic resistance to the chemical (A)</p> Signup and view all the answers

Study Notes

Natural Selection and Bacterial Resistance

  • A population of bacteria was exposed to a chemical, resulting in the death of most bacteria within 24 hours, while a few survived.
  • The survival of some bacteria was due to a genetic variation that provided resistance to the chemical.
  • This phenomenon is an example of natural selection.
  • The genetic variation that allowed the bacteria to resist the chemical was already present in the surviving bacteria, it was not acquired through mutation or ingestion/digestion of the chemical.
  • The correct answer is option C: They possessed a genetic variation that provided resistance to the chemical.

Chemical Resistance in Bacteria

  • A population of bacteria was exposed to a chemical, resulting in the death of most bacteria within 24 hours.
  • However, a few bacteria survived, indicating that they possessed a trait that allowed them to resist the chemical's effects.
  • The correct explanation for the survival of these bacteria is that they possessed a genetic variation that provided resistance to the chemical.

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A population of bacteria is exposed to a chemical, and some survive. Why did they survive? Choose the correct answer from the options.

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