Principles of Biology Lab II Midterm

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Biology

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144 Terms

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All living organisms share several key characteristics:

1. Order
2. Sensitivity or response to the environment
3. REPRODUCTION
4. Growth and development
5. Regulation
6. Homeostasis


1. Energy processing
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Living organisms are part of a highly __________ ____________.
structured; hierarchy
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Organization of Life:

1. Organelle- nucleus
2. Cells- human blood cells
3. Tissues- human skin tissue
4. Organs- stomach
5. Organ systems- digestive system
6. Organisms- pine tree
7. Populations- a group of pine trees
8. Communities- pine trees and animal species together
9. Ecosystem- coastal ecosystem including living organisms and the environment
10. Biosphere- ALL ecosystems on the Earth.
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Features of ALL cells:
the plasma membrane, cytoplasm, DNA, ribosomes
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Characteristics of prokaryotic cells
nucleoid, no membrane-bound organelles, cell wall, and some have flagella or pili
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Characteristics of eukaryotic cells
larger, more membrane-bound organelles, true nucleus (DNA surrounded by a membrane), and organized
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Function of a phylogenetic tree
they show the relationship of the three domains of life
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What are the three domains of life?
Bacteria, Archaea, Eukarya
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Define Taxonomy
the science of classifying organisms
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What is the scientific name for the common dog in binomial nomenclature?
Cannus lupus familiaris
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Forming a Hypothesis
Hypotheses must be testable and falsifiable.
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Experimental Design
Consider sample size, selection, and how to avoid bias.
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Experimental Variables
Determine the independent and dependent variables and what variables to control in the experiment.
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Interpreting Results
Gather data by measuring the dependent variable then assess whether the results are statistically significant
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Darwin's 3 principles of natural selection

1. Most characteristics of organisms are inherited or passed from parent to offspring.
2. More offspring are produced than are able to survive, so resources for survival and reproduction are LIMITED. Thus, there is COMPETITION for those resources in each generation.
3. Offspring VARY among each other in regard to their characteristics and those variations are inherited.
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Natural Selection
a process that leads to greater adaptation of the population to its environment.
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Finches from the Galapagos Islands
the beaks of the finches were different based on their distinct food sources.
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Explain evolution

1. Natural selection drives evolution, but first we need VARIATION
2. Variation arises from genetic mutations
3. Diversity is encouraged by SEXUAL reproduction
4. Environments change, and selective pressures shift forces adaptations
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T/F Evolution is a scientific theory.
True
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T/F Individuals evolve.
False, populations evolve
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T/F Theory of Evolution addresses how species change over time.
True
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Define species
group of organisms that can interbreed and produce fertile offspring
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Define gene pool
The collection of all the genes in a population
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rooted phylogenetic tree
Phylogenetic trees that originate back to one common ancestor
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Characteristics of a Virus
acellular and parasitic entities that are NOT CLASSIFIED within any kingdom.
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Progressive hypothesis of viruses
viruses arose from genetic elements that gained the ability to move between cells
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Regressive hypothesis of viruses
viruses are remnants of cellular organisms
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Virus-first hypothesis of viruses
viruses predate or coevolved within their current cellular hosts
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complex virus shape
T4 bacteriophage
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enveloped virus shape
Helical nucleocapsid: influenza virus \n Icosahedral nucleocapsid: HIV
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nonenveloped virus shape
Helical: tobacco mosaic virus \n Icosahedral: poliovirus
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Steps of viral infection

1. Attachment- phage attaches to the surface of the host cell
2. Entry- viral DNA enters the host cell
3. Replication- viral DNA replicates and its proteins assemble
4. Assembly- new viral particles are assembled
5. Release- the cell lyses, releasing newly made virions
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T/F Some hosts are used more than once to make new viruses
True
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Acute infection
symptoms get INCREASINGLY worse for a SHORT period followed by the elimination of the virus from the body by the immune system and recovery
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Long-term chronic infections
the continued presence of infectious virus following the primary infection and may include chronic or recurrent disease.
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Asymptomatic infections
viruses force cells to produce virions without causing any symptoms in the host.
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Examples of human viruses
Poliovirus, HIV, and Influenza virus (A/B)
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Live attenuated vaccine
weakened live virus inserted in PARTS
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Inactivated vaccines
dead organisms injected into patient to build immunity
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Toxoid vaccines
chemically or thermally modified toxins used to stimulate active immunity
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subunit vaccines
use antigenic fragments to stimulate an immune response
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Why is the COVID-19 vaccine different?
The RNA code is directly injected into you.
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anti-viral drugs
drugs that inhibit the virus by BLOCKING the actions of one or more of its proteins. Therefore, symptoms are MINIMIZED.
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Define ecology
the study of the interactions of living organisms with one another and with their environment
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Levels of Ecological research
\-Organismal Ecology \n -Population Ecology \n -Community Ecology \n -Ecosystem Ecology \n -Biosphere Ecology
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Define biomes
large ecosystems that cover huge geographic areas distinguished by characteristic temperature and precipitation
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How to characterize a population

1. Population size (N)
2. Total number of individuals
3. Population density
4. The number of individuals within a specific area
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T/F populations with fewer individuals are more stable compared to larger ones.
False, more individuals are stable based on their genetic variability.
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uniform distribution
Distribution where species are spaced evenly
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random distribution
species arranged in no particular pattern
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clumped distribution
species located in the same area
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How have humans overcome the caring capacity of the earth?
Multi-story house buildings
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The human population is growing exponentially, what potential problems could this cause?
Famine, disease, and large scale death.
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Define innate behavior
Genetically programmed behavior pattern of an animal.
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Define learned behavior
a relatively permanent change in behavior, or the potential for behavior, that results from experience
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examples of innate behavior
suckling of newborn mammals, birds building nests, spiders weaving webs
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example of learned behavior
habituation: an animal stops responding to a stimulus after a period of repeated exposure
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________ of the three domains are _____________.
two; prokaryotic
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Who were the first inhabitants of Earth?
prokaryotes
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Describe the earth's early atmosphere.
the atmosphere was anoxic, so only anaerobic organisms could survive, and autotrophic organisms converted solar into chemical energy.
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Describe cyanobacteria
blue-green algae evolved from simple phototrophs and began oxygenating the earth.
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Define extremophiles
organisms that live in extreme environments: \n Extreme heat, pressure, and cold
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Acidophiles
grow in pH 3 or below (acidic)
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Alkaliphiles
\n grow in pH 9 or above (basic)
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Thermophiles
grow in temperatures of 60-80 degrees Celsius (hot)
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Hyperthermophiles
grow in temperatures of 80-122 degrees Celsius (extreme hot)
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Psychrophiles
grow in temperature of -15-10 degrees Celsius (cold)
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Halophiles
grow in salt concentrations of at least 0.2 M (salty)
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Different prokaryotic shapes:

1. Cocci (spherical)
2. Bacilli (rod)
3. Spirilli (spiral)
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Bacteria vs. Archaea
Bacterial cells walls contain peptidoglycan \n Archaeal cells walls do not
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gram positive vs gram negative bacteria
Gram-positive: have simple cell walls with a thick layer of peptidoglycan. \n \n Gram-negative: more complex cell walls, less peptidoglycan, which is located between 2 membranes. More resistant to antibiotics.
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Structural differences and similarities between Bacteria and Archaea
Cell type: both Prokaryotic \n Cell morphology: both variable \n Cell wall: bacteria- contains peptidoglycan vs archaea- doesn't \n Cell membrane type: bacteria- BILAYER vs archaea- bi/mono \n P.M. lipids: bacteria- fatty acids vs archaea- phytanyl groups
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Prokaryote Reproduction
asexual binary fission
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steps of binary fission in prokaryotes
Parent cell, DNA duplicates, cytoplasm divides, and two daughter cells.
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Define epidemic
a disease that occurs in an unusually high number of individuals in a population at the same time.
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Define pandemic
a widespread, usually WORLDWIDE, epidemic
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Define endemic
a disease that is constantly present, usually at a low incidence, in a population.
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Define zoonoses and give an example
a disease that can be transmitted to humans from animals. \n example: SARS, Ebola
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How does antibiotic resistance occur?

1. high number of bacteria and a few of them are resistant to antibiotics
2. antibiotics kill bacteria causing the illness, as well as good bacteria protecting the body from infection
3. the resistant bacteria now have preferred conditions to grow and take over
4. bacteria can even transfer their drug resistance to other bacteria causing more problems
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Examples of good bacteria
probiotics (yogurt) \n \n natural gut bacteria \n \n microbiome of body \n \n started cultures (cheeses, beer, wine)
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Describe the gut microbiome
help us digest our food, produces crucial nutrients for us, and help train our immune systems to function correctly
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Viruses vs. Bacteria

1. Size- virus = small and bacteria = bigger
2. Reproduction- bacteria = reproduces and virus = need a host in order to multiply
3. Illness/Treatment- virus = shorter period of illness treated by rest/anti-virals and bacteria = longer period of illness treated by antibiotics
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Four sub classes of Eukaryotes
animal cells, plant cells, protists, and fungi
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Animal vs. Plant Cells
Plant cells have cell walls, vacuoles, and chloroplasts while animal cells do not
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T/F yeast is NOT a fungus
False, yeast is a fungus
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Define protists
eukaryotes that are not part of the plant, animal, or fungi kingdoms
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protist cell structure
Unicellular, colonial and multicellular, Nucleus and organelles
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How do protists protect themselves?
membrane, cell wall, silica-based shell, and pellicles of interlocking protein strips.
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How do protist move?

1. Pseudopodia
2. Cilia
3. Flagellum
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Protist metabolism
they exhibit many forms of nutrition and may be aerobic or anaerobic.
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Protist reproduction
Asexual: identical copy of parent; fission. \n Sexual: two parents, often involves conjugation (two join together and exchange genetic material using a second nucleus, then divide to produce four protists)
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Where do most protist live?
water (aquatic): freshwater, marine, damp soil, and snow environments \n a few protists live on DEAD organisms or their wastes \n (contributing to decay)
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Describe bioluminescence
protists that let off the light.
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Describe paramecium

1. primitive mouth = oral groove (eat)
2. anal pore (excrete waste)
3. Contractile vacuoles = excrete excess water
4. Cilia = enable movement
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protists as primary producers

1. some protists (including plankton) feed most of the world's aquatic species directly or indirectly.
2. approximately one-quarter of the world's photosynthesis is conducted by protists such as dinoflagellates, diatoms, and multicellular algae.
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Protists as decomposers

1. Protist saprobes are specialized to absorb nutrients from nonliving organic matter, such as dead organisms or their wastes.
2. Saprobic protists have the essential function of returning inorganic nutrients to the soil and water. This process allows for new plant growth.\`
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Pathogenic Protists
malaria and African sleeping sickness
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Plant parasites
P. viticola- destroys food crops causing downy mildew (yellow)
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Traits of Land Plants

1. the alternation of generations
2. a sporangium in which the spores are formed
3. a gametangium that produces haploid cells
4. apical meristem tissue in roots and shoots
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Explain alternation of generations
\*The gametophyte is haploid and produces haploid gametes by mitosis \n \*Fusion of gametes gives rise to diploid sporophytes, which produce haploid spores by meiosis