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BSC 108 Kennedy Exam 3 - University of Alabama (Questions With Complete Solutions) Graded A+
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BSC 108 Kennedy Exam 3 - University of Alabama (Questions With Complete Solutions) Graded A+
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Name: Score:134 Multiple choice questions
Term 1 of 134
What are the characteristics of a tropical grassland?
most diverse ecosystem on Earth, near equator, high precipitation, year-round warmth,
flourishing vegetation
formed by blocked or ending rivers, soil is supersaturated, water is mainly still but can be
moving in some slanted areas
similarities among living organisms that are due to similar environmental pressures and
natural selection (convergent evolution)
high amount, but not enough rain to support a forest, grasses dominate, scattered trees
may be common
Term 2 of 134
One parent molecule is composed of two __________________ that separate.
complementary
complementary strands
origins of replication
replication bubbles, using the parent strands as templates
,Term 3 of 134
What is the nitrogen cycle?
the evolution of diversely adapted species from a common ancestor upon introduction to a
new environment
it encompasses all of the ecosystems on Earth
single-stranded nucleic acid
1. Planting crops adds nitrogen to the soil
2. Bacteria in soil and water fix nitrogen, resulting in NH4 (ammonium)
3. After fixed, some of the ammonium is taken up and used by plants
4. Nitrifying bacteria in soil also converts some NH4 into NO3 (nitrate) which is more often
acquired by plants
5. Plants use nitrogen to make molecules such as amino acids/proteins
6. Plants are consumed, along with the nitrogen they contain
7. Decomposers decompose dead animals, releasing nitrogen into soil and atmosphere
a. Humans combustion of fossil fuels and modern agricultural process are adding more
nitrogen to atmosphere
b. More is being released than consumed, contributing to global warming and pollution of
aquatic systems from nitrogen fertilizers
Term 4 of 134
What is a food chain?
small ring of self-replicating DNA separate from the larger chromosome(s)
sequence of food transfers between trophic levels of a community, beginning with
producers
evolutionary process in which one species splits into two or more species
far northern regions of the world, consist of always green needle-and-cone trees, such as
pine and spruce
,Term 5 of 134
What is descent with modification?
altered mRNA to be transcribed and different amino acids to be added to the polypeptide
chain
organisms that consume dead organic matter
a GMO that has received genes from an organism from another species
all organisms are related through descent from a common ancestor
these descendants spilled into various habitats over millions of years
accumulated various modifications that fit them to their specific ways of life
Term 6 of 134
What is recombinant DNA?
molecule containing DNA from two different sources
change in one base pair of a gene
a close relationship between two species
larger carnivores that consume smaller carnivores
Term 7 of 134
Natural selection can amplify or diminish only ________ traits, not ________ traits
heritable; acquired
environmental factors vary from place to place and time to time
double helix, twisted ladder
nucleus of a cell
, Term 8 of 134
What are analogies (analogous structures)?
temperate, not enough rain to support a forest, flat, rich soil, large number of animals
ocean, lakes, ponds, rivers, streams, coral reef, marsh, tundra, taiga, temperate forest,
tropical rain forest, temperate grassland, tropical grassland, desert
similarities among living organisms that are due to similar environmental pressures and
natural selection (convergent evolution)
flowing freshwater, higher O2 levels than stationary waters, natural, contains channels that
empty into larger bodies of water
Term 9 of 134
What is reproductive cloning?
manipulation of organisms or their parts to produce a useful product
plants and other autotrophs - produce the food for an ecosystem
purposeful breeding of domesticated plants and animals by humans (dog breeding)
using a body cell to make one or more genetically identical individuals
Term 10 of 134
Where and how does synthesis of two new complementary strands occur?
reproductive cloning of human cells by nuclear transplantation
high amount, but not enough rain to support a forest, grasses dominate, scattered trees
may be common
replication bubbles, using the parent strands as templates
manipulation of organisms or their parts to produce a useful product
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