C190 INTRO TO BIOLOGY OA 2026/2027 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
What item would be classified as Biotic? - (ANSWER)Fungus
What Item is an atom? - (ANSWER)Nitrogen
Largemouth bass have recently been introduced into ponds that previously did not contain any large,
predatory fish. Which adaptation would help the existing population of small, prey species of fish avoid
predation from the largemouth bass? - (ANSWER)Faster average swim speed
If global climate change continues (as predicted) to increase the average temperature of habitats around
the world, how would populations of spadefoot toads likely evolve in response to an increase in pond
temperatures? - (ANSWER)Spadefoot toads would likely evolve to have a higher percentage of toads
become carnivorous.
Male peacocks compete with one another to mate female peacocks. Males with more colorful tail
feathers attract female mates at a higher rate than those without. Therefore, male peacocks have
colorful tail feathers, whereas female peacocks do not. What is this an example of? - (ANSWER)Sexual
selection
A gardener maintains a species of rose that produce either yellow flowers (the dominant phenotype) or
white flowers (the recessive phenotype). One day, the gardener observes that a cross between two
yellow rose bushes has led to a single rose bush with orange flowers. What evolutionary mechanism is
involved in the change in the gene pool of this species? - (ANSWER)Mutation
Which two characteristics are found in organism C? - (ANSWER)Jaw and Lungs
Where is the ancestor of wolves and gorillas, but not frogs, depicted on this cladogram? -
(ANSWER)Point E
Which organism has neither bones nor a jaw? - (ANSWER)Lamprey
, C190 INTRO TO BIOLOGY OA 2026/2027 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
Which two organisms have eggs with shells? - (ANSWER)Crocodilians and Amphibians
Which organisms have four limbs and produce amniotic eggs without shells? - (ANSWER)Primates and
Rodents and Rabbits
Which species on the following cladogram has the most similar DNA sequence to species E? -
(ANSWER)D
A subatomic particle has a negative charge and is found in a shell of the atom. What is this particle? -
(ANSWER)An electron
What is the charge of a proton? - (ANSWER)+1 (positive)
A molecular bond results from an electron being transferred from one atom to another. Which type of
bond holds these atoms together? - (ANSWER)Ionic
Which situation describes covalent bonding? - (ANSWER)An atom shares an electron with another atom.
After a rainy day, a leaf has small droplets of water on its surface. Which property of water is this an
example of? - (ANSWER)Cohesion
A plastic water bottle is filled with water and placed in the freezer. The next day the frozen water has
expanded, causing the plastic bottle to rupture. Which characteristic of water is this an example of? -
(ANSWER)Density
A biological polymer consists of 358 amino acids linked together covalently. What is this polymer? -
(ANSWER)A protein
VERIFIED ANSWERS.
What item would be classified as Biotic? - (ANSWER)Fungus
What Item is an atom? - (ANSWER)Nitrogen
Largemouth bass have recently been introduced into ponds that previously did not contain any large,
predatory fish. Which adaptation would help the existing population of small, prey species of fish avoid
predation from the largemouth bass? - (ANSWER)Faster average swim speed
If global climate change continues (as predicted) to increase the average temperature of habitats around
the world, how would populations of spadefoot toads likely evolve in response to an increase in pond
temperatures? - (ANSWER)Spadefoot toads would likely evolve to have a higher percentage of toads
become carnivorous.
Male peacocks compete with one another to mate female peacocks. Males with more colorful tail
feathers attract female mates at a higher rate than those without. Therefore, male peacocks have
colorful tail feathers, whereas female peacocks do not. What is this an example of? - (ANSWER)Sexual
selection
A gardener maintains a species of rose that produce either yellow flowers (the dominant phenotype) or
white flowers (the recessive phenotype). One day, the gardener observes that a cross between two
yellow rose bushes has led to a single rose bush with orange flowers. What evolutionary mechanism is
involved in the change in the gene pool of this species? - (ANSWER)Mutation
Which two characteristics are found in organism C? - (ANSWER)Jaw and Lungs
Where is the ancestor of wolves and gorillas, but not frogs, depicted on this cladogram? -
(ANSWER)Point E
Which organism has neither bones nor a jaw? - (ANSWER)Lamprey
, C190 INTRO TO BIOLOGY OA 2026/2027 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
Which two organisms have eggs with shells? - (ANSWER)Crocodilians and Amphibians
Which organisms have four limbs and produce amniotic eggs without shells? - (ANSWER)Primates and
Rodents and Rabbits
Which species on the following cladogram has the most similar DNA sequence to species E? -
(ANSWER)D
A subatomic particle has a negative charge and is found in a shell of the atom. What is this particle? -
(ANSWER)An electron
What is the charge of a proton? - (ANSWER)+1 (positive)
A molecular bond results from an electron being transferred from one atom to another. Which type of
bond holds these atoms together? - (ANSWER)Ionic
Which situation describes covalent bonding? - (ANSWER)An atom shares an electron with another atom.
After a rainy day, a leaf has small droplets of water on its surface. Which property of water is this an
example of? - (ANSWER)Cohesion
A plastic water bottle is filled with water and placed in the freezer. The next day the frozen water has
expanded, causing the plastic bottle to rupture. Which characteristic of water is this an example of? -
(ANSWER)Density
A biological polymer consists of 358 amino acids linked together covalently. What is this polymer? -
(ANSWER)A protein
