introduction: themes in the study of life - mcccblinderl/documents/ch1intro.pdf · biology study of...
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Introduction: Themes in the Study of Life
Chapter 1
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definitions
Evolution
process of change transformed life over 3.5 billion years
Biology study of living things
evidence based answers
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Characteristics of life
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1. Regulation
keep internal conditions relatively constant under changing environmental conditions
Ex. body temperature
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2. Energy processing
• Capture
• Use
• Store
Heart rate max 1200 b/m
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4. Reproduction
Produce next generation
• Strategies
FYI
• Female birds, rabbits, reptiles can store sperm for months
• Tilapia (fish) brood eggs in the mouth
• Reef fish can switch sex in minutes
• Kangaroo raise young in a ventral pouch
• Leopard slug
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5. Response to environment
stimulus response
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6. Evolutionary adaptation
• Evolve over many generations
• Hereditable traits
Cuttlefish – capture energy, regulation,
reproduction, adaptation
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7. Order
Arrangement of structures
Function
Find the properties of life in this video Regulation, energy processing, growth and
development, reproduction, response, adaptation, order
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The biosphere
Communities
Populations
Organisms
Ecosystems
Organs and organ systems
Cells
Cell
Organelles
Atoms
Molecules
Tissues
Life studied at different organizational levels
molecules living planet
power of ten
Enhanced scale of universe
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The biosphere
Biosphere - all
environments on Earth
that support life
What are these
environments?
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Ecosystem - living things in
an area + nonliving
Ex. forest, ocean
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Communities - all living
species in an ecosystem
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Population - all individuals of
a species in a specific area
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Organisms
Organism - individual
Amoeba has
properties of life
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Organ system - organs that cooperate
for specific function
Organ - multiple tissue types to
function
Organ = leaf
Organ system = shoot system
Organ = heart
Organ system = ?
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Tissues – group of cells
that work together
Dermal tissue
Myocardial tissue
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• Cell –basic unit of life
– Organisms unicellular or multicellular
• Organelles – functional components of a cell
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Molecules – consist of two or more
atoms
Atom– smallest unit of matter that
retains the properties of an element
H2O NaCl C6H12O6
Chlorophyll
C55H72O5N4Mg
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Theme: Emergent properties
• Arrangement and interaction of parts in complex organisms lead to complex properties
Example: A heart cell cannot perform all the functions of a heart, but collectively, they pump blood
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Reductionism
• Study parts of system
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Systems Biology study of system
ex. a leaf, a brain
• Ex:
– How does drug for blood pressure affect other organs?
– How does increase in CO2 affect life on earth?
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Nucleus
Interaction of proteins
in a eukaryotic cell
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Themes: Organisms interact with environments, exchanging matter, energy
Ex: tree
water from soil roots help form soil
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Ecosystem Dynamics
– Cycling of nutrients
• materials used by plants/animals return to the soil via decomposition
• Rabbit decomposition
– Flow of energy
• sunlight producers consumers decomposers
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http://www.bcgrasslands.org/SiteCM/i/upload/
4D9BB688B89B4092F9D10BDAEF83EC41E7
62FBDB.jpg
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Sunlight
Ecosystem
Heat
Heat
Cycling
of
chemical
nutrients
Producers
(plants and other
photosynthetic
organisms)
Chemical energy
Consumers
(such as animals)
ECOSYSTEM
DYNAMICS
Cycling of
nutrients
and
Energy flow
heat
heat
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Energy Conversion
• Energy in different forms
– light, chemical, kinetic, thermal
Light sugar ATP motion heat
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• http://session.masteringbiology.com/myct
• Activity: Energy Flow and Chemical Cycling
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• Theme: Structure and function correlated
– leaf thin and flat, max capture of light
– birds wings aerodynamic
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Theme: Cells are basic unit of life
• Lowest level of organization that can perform all life activities
• Cells:
– Cell membrane
– DNA genetic information
– Replicate
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Two types of cells
Eukaryotic cell
– Membrane-enclosed organelles, and nucleus
– Plantae, Animalia, Fungi, Protista
Prokaryotic cell
– Simpler, smaller
– No nucleus or organelles
– Bacteria, Archaea
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• Theme: The continuity of life is based on heritable information (DNA)
• Chromosomes
– Strands of DNA (deoxyribonucleic acid)
– Contain genes
• Genes
– units of DNA that encode proteins
– Proteins determine traits
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• DNA double helix of nucleotide building blocks
• Genome = all the DNA in a cell (has all instructions)
D
N
A Ce
ll
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Nuclei containing DNA
Sperm cell
Egg cell
Fertilized egg with DNA from both parents
Embryo’s cells with copies of inherited DNA
Offspring with traits inherited from both parents
DNA is inherited
Before a cell divides, DNA is copied
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The human genome and others have been sequenced
http://imgs.sfgate.com/c/pictures/2004/08/30/mn_genome30gr.jpg
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Theme: Feedback mechanisms
• Allow body to self-regulate
• Negative feedback
– as more of product accumulates, the process that creates it slows and less product produced
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Negative feedback: insulin action
Describe how the sweating response is negative feedback
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D
D D
D
C
B
A
Enzyme 1
Enzyme 2
Enzyme 3
–
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• Positive feedback
– As more of product accumulates, the process that creates it speeds up and more product produced
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Positive feedback: uterine contractions
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Z
Enzyme 4
Enzyme 5
Enzyme 6 Z
Z
Z
Y
X
W
+
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Core Theme: Evolution “Nothing in biology makes sense except in the light of evolution”—
Theodosius Dobzhansky
All organisms living on Earth are descendants of common ancestors
– Shared features
• Ex. Backbone in vertebrates, cells, DNA
– Divergent features
• Ex. Number of toes in foot, cell wall
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Diversity of Life
• Evolution unifies biology
• ~1.8 million extant species have been identified and named to date (could be >10 million)
6,300 bacteria
10,000 fungi
290,000 plants
52,000 vertebrates
1 million insects
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Grouping Species
• Taxonomy
– name and classify species into groups
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Species Genus Family Order Class Phylum Kingdom Domain
Ursus americanus
(American black bear)
Ursus
Ursidae
Carnivora
Mammalia
Chordata
Animalia
Eukarya
Ursus americana
Ursus
Ursidae
Carnivora
Mammalia
Chordata
Animalia
Eukarya
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Three Domains of Life
• Domain Bacteria and Domain Archaea - prokaryotic cells
• Domain Eukarya
– Eukaryotic cells
Anthrax T. aquaticus Paramecium
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Bacillus anthracis
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Methanosarcinia rumen is anaerobic,
produces methane, is found in rumen of cows
Staphylothermus is found in 98oC hot spring,
thrives on sulfur
Halococcus salfodinae lives in high salt
http://www.microbiologyonline.org.uk
Methanobrevibacter smithii lives in the
human gut digests polysaccharides
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(a) DOMAIN BACTERIA
(b) DOMAIN ARCHAEA
(c) DOMAIN EUKARYA
Kingdom
Protista
Kingdom Fungi
Kingdom
Plantae
Kingdom Animalia
Kingdom Plantae
Eukarya includes
kingdoms: Plantae
Fungi
Animalia
Protista
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Unity in Diversity
Examples:
DNA is the universal genetic material that connects diverse organisms
All living organisms consist of at least one cell
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Cilia of Paramecium
Cross section of a cilium, as viewed with an electron microscope
Cilia of
windpipe
cells
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September 15, 2009 Niger --Scientists excavate the 43-foot-long (13-
meter-long) skeleton of a new species of sauropod--or four-legged plant-
eater. Spinophorosaurus nigerensis, had a tail studded with bony spikes that the
animal likely swung at predators
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• Charles Darwin On the Origin of Species by Means of Natural Selection in 1859
• 2 main points:
–Descent with modification • Species share a common ancestor
–Natural selection mechanism of evolution
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Attenborough video
Which orchids are the most successful?
What traits are selected for?
What is in the pollen?
Where is the pollen delivered?
Which orchids will send their genes to the next generation?
Think: millions of years of evolution results in adaptive traits in species
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• Darwin observed that:
1. Traits vary randomly
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2. More offspring produced than can survive "In October 1838, that is, fifteen months after I had
begun my systematic inquiry, I happened to read for
amusement Malthus on Population, and being well
prepared to appreciate the struggle for existence which
everywhere goes on from long- continued observation
of the habits of animals and plants, it at once struck me
that under these circumstances favourable variations
would tend to be preserved, and unfavourable ones to be
destroyed. The results of this would be the formation of
a new species. Here, then I had at last got a theory by
which to work".
Elephants start to breed at around age 30. They
breed to 90 years old. In that time, one elephant has
6 offspring. Darwin calculated that after 750 years,
there would be 19 million desendants from the
original breeding pair IF all survived.
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3. Competition
4. Reproductive fitness
5. Traits are heritable
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• Darwin inferred that:
– Because of natural selection, in time, more individuals in a population will have the advantageous traits
– No acquired traits inherited
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Population with varied inherited traits.
Elimination of individuals with certain traits.
Reproduction of survivors.
Increasing frequency of traits that enhance survival and reproductive success.
4 3 2 1
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• Natural selection results in adaptations
Ex. Bat wings
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Examples of adaptations
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Descent with modification leads to adaptation
Ex. Mammalian limb
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• natural selection
– ancestral species descendent species
– Ex. finch species of Galápagos Islands
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COMMON
ANCESTOR
Warb
ler
finch
es
Inse
ct-e
ate
rs Seed
-eate
r
Bu
d-e
ate
r
Inse
ct-e
ate
rs
Tre
e fin
ch
es
Green warbler finch
Certhidea olivacea
Gray warbler finch
Certhidea fusca
Sharp-beaked
ground finch
Geospiza difficilis Vegetarian finch
Platyspiza crassirostris
Mangrove finch
Cactospiza heliobates
Woodpecker finch
Cactospiza pallida
Medium tree finch
Camarhynchus pauper Large tree finch
Camarhynchus
psittacula Small tree finch
Camarhynchus
parvulus Large cactus
ground finch
Geospiza conirostris Cactus ground finch
Geospiza scandens
Small ground finch
Geospiza fuliginosa
Medium ground finch
Geospiza fortis
Large ground finch
Geospiza magnirostris
Gro
un
d
finch
es
Seed
-eate
rs
Cactu
s-
flow
er-e
ate
rs
Evolutionary tree shows
ancestral relationships
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http://www.cartage.org.lb/en/themes/Sciences/Zoology/Biologicaldiverstity/
Classification/cladogram_1.gif
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• Fossils
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• Fossils document the evolution of life on Earth over billions of years
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THE SCIENTIFIC METHOD
• The word Science means “to know”
• Inquiry
– search for information and explanation
• 2 types of scientific inquiry:
– discovery
• Describe nature
– hypothesis-based
• Design experiments to test a hypothesis
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Hypothesis - tentative answer to well-framed question, an educated guess
• leads to predictions that can be tested
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Hypotheses
• must be testable
• test one hypothesis at a time
• Must be falsifiable
• does not need to be correct
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• Independent (experimental) variable • the one aspect that varies among test groups
• Control group
– baseline group for comparison
• Controlled variables
– Held constant, do not vary among groups
• Dependent variable
– What is measured
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• failure to falsify hypothesis does not prove hypothesis
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EXAMPLE • 2005, NJEM published results of study of Echinacea for
prevention and treatment of the common cold.
• The research team tested 3 preparations of the roots of a
Echinacea angustifolia. They extracted the root using
procedures that represent some of the different ways that
Echinacea is used to treat colds.
• Hypothesis:
• Independent variable:
• Control group:
• What is a placebo?
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437 healthy adult volunteers were assigned at random to receive one
of the three root preparations or a placebo. The volunteers received
Echinacea or a placebo in two phases: a preventive phase and a
treatment phase. The preventive phase lasted 7 days. On the 7th day,
the volunteers were exposed to a nasal spray with a virus that induces
a cold in ~ 2 days. Then, volunteers were isolated for 5 days while
the research team observed and tested them as to the appearance and
severity of cold signs and symptoms.
Dependent variable(s):
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The researchers found that none of the 3 preparations of Echinacea
at the 900 mg per day dose had effects on whether volunteers
became infected with the cold virus The 3 preparations did not affect
the severity or duration of symptoms among those who developed
colds.
Critics of this study believe the dose of E. angustifolia used was too
low.
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• Hypothesis
– Zinc helps people recover from colds
Y axis???
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Data • Qualitative = descriptions
• Quantitative = measurements-organized into tables and graphs
http://thesituationist.files.wordpress.com/2008/
02/jane-goodall.jpg
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Limitations of Science
• Results must be repeatable
• Science must use natural processes!
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Theories in Science
• Theory
– Broader in scope than hypothesis
– General and can lead to new testable hypotheses
– Supported by large body of evidence
Theory of gravity
Theory of evolution
Theory of round earth
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EXAMPLE • In a Univ. of Virginia. study, 3 drugs, interferon,
chlorpheniramine and ibuprofen were investigated for the effects on symptoms of the common cold
• Chlopheniramine – antihistamine that blocks cold symptoms
• Ibuprofen (advil) – anti-inflammatory
• Interferon – antiviral drug
• Hypothesis:
• What is a double blind study?
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The researchers tested the treatment in a double blind, placebo-
controlled trial in 150 young male and female adults.
A Q-tip containing virus inserted was inserted into the nose. All
developed colds.
Treatment with the three drugs or placebo started as soon as the
cold developed. The drugs were given orally at 12 hour intervals.
For 5 days, the volunteers scored their symptoms of sneezing, runny
nose, sore throat, cough, and headache. The virus concentration in
nasal secretions was determined.
Independent variable
3 controlled variables
Control
Dependent variable(s)
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results
the average total symptoms of volunteers receiving the
actual drugs were reduced by 33 -73 % compared to
those on non-active placebo treatment.
Conclusion:
The new treatment is licensed to Coldcure, Inc., in
Richmond for development into commercial use.