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BSC 108 Exam 3 – Kennedy University Of
Alabama| Complete Questions And Verified
Answers
The structure of a strand of DNA. -correct-answer-it is a double helix, like a
twisted ladder.
the ladder rings are nucleotide subunits and they have a covalent bond to the
sugar phosphate backbone (made of deoxyribose and a phosphate group)
What are the nucleotide subunits? -correct-answer-adenine, guanine, cytosine,
and thymine
How are the subunits held together? -correct-answer-through a hydrogen bond
What are the nucleotide subunits compliments? -correct-answer-Adenine and
thymine
cytosine and guanine
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How does DNA replicate? -correct-answer-the parent strand breaks off into two
and then enzymes (DNA polymerases) attach the complimentary nucleotide to
each side, creating two separate daughter strands
What is the location site of where DNA replication begins on the double helix
called? -correct-answer-the origins of replication
what is an ecosystem -correct-answer-consists of a community interacting with
the physical environment
primary vs. secondary ecological succession -correct-answer-primary: a type of
ecological succession in which a biological community begins in an area without
soil (almost life-less area)
secondary: a type of ecological succession that occurs where a disturbance has
destroyed an existing biological community but left the soil intact. (like a flood
destroys everything but the soil is still in tact)
What are the different ways two species can interact in a community? (5) -correct-
answer-1. predation
2. competition
3. parasitism.
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4. commensalism
5. mutualism
How does two species interact in a community through predation? -correct-
answer-Which one species (predator) kills and eats another. (prey)
How does two species interact in a community through competition? -correct-
answer-Between species, the population growth of a species may be limited by
the population densities of competing species as well as the density of its own
population.
How does two species interact in a community through parasitism? -correct-
answer-Parasite lives on or in a host from which is obtains nourishment.
How does two species interact in a community through commensalism? -correct-
answer-Relationships between two organisms where one organism benefits from
the other without affecting it.
How does two species interact in a community through mutualism? -correct-
answer-Both species benefit from an interaction.
BSC 108 Exam 3 – Kennedy University Of
Alabama| Complete Questions And Verified
Answers
The structure of a strand of DNA. -correct-answer-it is a double helix, like a
twisted ladder.
the ladder rings are nucleotide subunits and they have a covalent bond to the
sugar phosphate backbone (made of deoxyribose and a phosphate group)
What are the nucleotide subunits? -correct-answer-adenine, guanine, cytosine,
and thymine
How are the subunits held together? -correct-answer-through a hydrogen bond
What are the nucleotide subunits compliments? -correct-answer-Adenine and
thymine
cytosine and guanine
,2|Page
How does DNA replicate? -correct-answer-the parent strand breaks off into two
and then enzymes (DNA polymerases) attach the complimentary nucleotide to
each side, creating two separate daughter strands
What is the location site of where DNA replication begins on the double helix
called? -correct-answer-the origins of replication
what is an ecosystem -correct-answer-consists of a community interacting with
the physical environment
primary vs. secondary ecological succession -correct-answer-primary: a type of
ecological succession in which a biological community begins in an area without
soil (almost life-less area)
secondary: a type of ecological succession that occurs where a disturbance has
destroyed an existing biological community but left the soil intact. (like a flood
destroys everything but the soil is still in tact)
What are the different ways two species can interact in a community? (5) -correct-
answer-1. predation
2. competition
3. parasitism.
, 3|Page
4. commensalism
5. mutualism
How does two species interact in a community through predation? -correct-
answer-Which one species (predator) kills and eats another. (prey)
How does two species interact in a community through competition? -correct-
answer-Between species, the population growth of a species may be limited by
the population densities of competing species as well as the density of its own
population.
How does two species interact in a community through parasitism? -correct-
answer-Parasite lives on or in a host from which is obtains nourishment.
How does two species interact in a community through commensalism? -correct-
answer-Relationships between two organisms where one organism benefits from
the other without affecting it.
How does two species interact in a community through mutualism? -correct-
answer-Both species benefit from an interaction.
