Unit 3 of 5
Study guide for CLEP CLEP Biology — Unit 3: Evolution and Diversity. Practice questions, key concepts, and exam tips.
65
Practice Questions
13
Flashcards
8
Key Topics
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A researcher is studying the effects of a new pesticide on a population of rabbits. The pesticide is found to increase the expression of a gene that codes for an enzyme involved in detoxification. Which of the following best describes the likely outcome of this increased gene expression?
The rabbits will become more resistant to the pesticide over time.
The rabbits will experience no change in population size due to the pesticide.
The rabbits will experience a decrease in population size due to the pesticide.
The rabbits will become less resistant to the pesticide over time.
The rabbits will become more susceptible to other environmental toxins
Answer: A — Increased expression of the detoxification enzyme will allow the rabbits to break down the pesticide more efficiently, making them more resistant.
What is the main criterion used to classify organisms into different domains?
Cell wall composition
Membrane structure
Metabolic pathways
Ribosomal RNA sequences
Cell type and membrane-bound organelles
Answer: D — Ribosomal RNA sequences is correct because they are used to determine the evolutionary relationships among organisms and classify them into different domains, such as Archaea, Bacteria, and Eukarya.
A population of birds has a diverse gene pool, with some individuals having a genetic variation that allows them to survive in areas with limited food resources. If environmental conditions change and food becomes scarce, which of the following is most likely to occur?
The genetic variation will become less common in the population over time.
The population size will remain the same, but the genetic variation will not be affected.
The genetic variation will have no effect on the population's survival.
The genetic variation will become more common in the population over time.
The population will become extinct due to the genetic variation
Answer: D — Natural selection will favor individuals with the genetic variation, allowing them to survive and reproduce, thus increasing the frequency of the variation in the population.
What is the term for the frequency of alleles remaining constant from one generation to the next?
Mendelian inheritance
Gene flow
Hardy-Weinberg equilibrium
Natural selection
Genetic drift
Answer: C — Hardy-Weinberg equilibrium is correct because Hardy-Weinberg describes equilibrium.
Methanogens are
Bacteria
Fungi
Protists
Eukaryotes
Archaea
Answer: E — Archaea is correct because methanogens are a type of archaeon.
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