BSC 1005 Exam 4 questions with
complete solutions A+ rated
population - correct answer ✔✔- a group of organisms of the same species living together in
the same geographic location
evolution - correct answer ✔✔- Change over time
- allege frequency changes
- population evolves, not the individual
fitness - correct answer ✔✔- an organisms ability to survive and reproduce in a particular
environment
- higher fitness = increased change of alleles being passed to the next generation
natural selection - correct answer ✔✔- the differential survival and reproduction of individuals
within a population in response to environmental pressure
- occurs in patterns
directional selection - correct answer ✔✔predominant phenotypes near one end of the
spectrum
stabilizing selection - correct answer ✔✔predominant phenotypes near middle of the spectrum
diversifying selection - correct answer ✔✔predominant phenotypes are at both ends of the
spectrum
,Staphyloccus aureus - correct answer ✔✔- aka: staph
- 30-40% of people carry on skin and in noses
- sometimes strains are harmless; others cause diseases
- drug resistant strains exist
Methicilin-resistant staphylococcus aureus (MRSA) - correct answer ✔✔- infectious bacterium
- developed resistance to antibiotics
- affect people with a weak immune system
antibiotics - correct answer ✔✔- chemical that kills bacteria
- interfere with the function of essential bacteria cell structures
bianary fission - correct answer ✔✔- one parental cell divides into two daughter cells
antibiotic resistance - correct answer ✔✔- caused by acquiring new alleles in bacteria
- kills 23,000 people in the US per year
- random mutation
- gene transfer (passing genes between bacteria)
Nebular Hypothesis - correct answer ✔✔- explanation for the formation of the universe
- the entire solar system was formed at the same time due to the collapse of a swirling solar
nebula
igneous rock - correct answer ✔✔- formed from cooling and hardening of molten lava
- used for radiometric dating
, sedimentary rock - correct answer ✔✔- formed from pre existing rocks and dead organisms that
are buried and become cemented
- fossils
radiometric dating - correct answer ✔✔the amount of radioactivity present in a rock is used as
a geologic clock
radioactive isotopes - correct answer ✔✔unstable forms of elements that decay into other
elements by emitting energetic particles (radiation)
isotope half life - correct answer ✔✔- the time it takes for half the isotope in a sample to break
down
- different radioactive isotopes decay at different rates
- constant for every isotope
- used to determine the age of the materials in which they're found
estimated age of the earth - correct answer ✔✔4.5 billion years (life started over 3 billion years
ago)
Harold Urey, Stanley Miller (1953) - correct answer ✔✔- replicated the chemical environment of
early earth in the lab (H2, CH4, NH3 and H2O)
- their experiments yielded new organic molecules, including amino acids, sugars, lipids and
nucleotides
- showed that it is possible to produce molecules of life from inorganic materials
geological time scale of earth - correct answer ✔✔- produced using the fossil record and
radiometric dating
3.7 billion years ago... - correct answer ✔✔- oldest known fossil
complete solutions A+ rated
population - correct answer ✔✔- a group of organisms of the same species living together in
the same geographic location
evolution - correct answer ✔✔- Change over time
- allege frequency changes
- population evolves, not the individual
fitness - correct answer ✔✔- an organisms ability to survive and reproduce in a particular
environment
- higher fitness = increased change of alleles being passed to the next generation
natural selection - correct answer ✔✔- the differential survival and reproduction of individuals
within a population in response to environmental pressure
- occurs in patterns
directional selection - correct answer ✔✔predominant phenotypes near one end of the
spectrum
stabilizing selection - correct answer ✔✔predominant phenotypes near middle of the spectrum
diversifying selection - correct answer ✔✔predominant phenotypes are at both ends of the
spectrum
,Staphyloccus aureus - correct answer ✔✔- aka: staph
- 30-40% of people carry on skin and in noses
- sometimes strains are harmless; others cause diseases
- drug resistant strains exist
Methicilin-resistant staphylococcus aureus (MRSA) - correct answer ✔✔- infectious bacterium
- developed resistance to antibiotics
- affect people with a weak immune system
antibiotics - correct answer ✔✔- chemical that kills bacteria
- interfere with the function of essential bacteria cell structures
bianary fission - correct answer ✔✔- one parental cell divides into two daughter cells
antibiotic resistance - correct answer ✔✔- caused by acquiring new alleles in bacteria
- kills 23,000 people in the US per year
- random mutation
- gene transfer (passing genes between bacteria)
Nebular Hypothesis - correct answer ✔✔- explanation for the formation of the universe
- the entire solar system was formed at the same time due to the collapse of a swirling solar
nebula
igneous rock - correct answer ✔✔- formed from cooling and hardening of molten lava
- used for radiometric dating
, sedimentary rock - correct answer ✔✔- formed from pre existing rocks and dead organisms that
are buried and become cemented
- fossils
radiometric dating - correct answer ✔✔the amount of radioactivity present in a rock is used as
a geologic clock
radioactive isotopes - correct answer ✔✔unstable forms of elements that decay into other
elements by emitting energetic particles (radiation)
isotope half life - correct answer ✔✔- the time it takes for half the isotope in a sample to break
down
- different radioactive isotopes decay at different rates
- constant for every isotope
- used to determine the age of the materials in which they're found
estimated age of the earth - correct answer ✔✔4.5 billion years (life started over 3 billion years
ago)
Harold Urey, Stanley Miller (1953) - correct answer ✔✔- replicated the chemical environment of
early earth in the lab (H2, CH4, NH3 and H2O)
- their experiments yielded new organic molecules, including amino acids, sugars, lipids and
nucleotides
- showed that it is possible to produce molecules of life from inorganic materials
geological time scale of earth - correct answer ✔✔- produced using the fossil record and
radiometric dating
3.7 billion years ago... - correct answer ✔✔- oldest known fossil
