Theme A IB Bio HL Practice Exam

What is the "Goldilocks zone"?

• A region where stars are born.

• A range around a star where conditions may allow liquid water to exist.

• A zone where planets are too hot for life.

• A region with no atmosphere.

Which base pairing is found in DNA?

• A-U and G-C

• A-T and C-G

• A-C and G-T

• A-G and C-T

What theory explains the origin of mitochondria and chloroplasts?

• Abiogenesis Theory

• Endosymbiosis Theory

• Panspermia Theory

• Spontaneous Generation Theory

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What is typically consistent within a species to maintain genetic stability?

• Chromosome number

• Body size

• Color pattern

• Habitat preference

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What did the Miller-Urey experiment demonstrate?

• The formation of DNA from RNA

• The formation of amino acids from inorganic molecules

• The creation of life from water

• The synthesis of proteins from lipids

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What role do hydrogen bonds play in DNA?

• They destabilize the DNA structure.

• They provide stability to the DNA double helix.

• They prevent DNA replication.

• They cause mutations in DNA.

What is a key feature of adaptive radiation?

• Decreased biodiversity

• Creation of species specialized for unique ecological roles

• Uniformity in species

• Lack of evolutionary change

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What is a characteristic of viruses?

• They have a cytoplasm.

• They can perform independent metabolism.

• They lack cellular components like cytoplasm.

• They have a cell membrane.

What is the main difference between allopatric and sympatric speciation?

• Allopatric speciation occurs without geographic separation, while sympatric speciation requires it.

• Allopatric speciation occurs with geographic separation, while sympatric speciation occurs within the same geographic area.

• Both allopatric and sympatric speciation occur with geographic separation.

• Sympatric speciation occurs with geographic separation, while allopatric speciation occurs within the same area.

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Which type of isolation is associated with sympatric speciation?

• Geographic isolation

• Temporal isolation

• Behavioral isolation

• Both B and C

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