EOI Review Cells

Cell Transport PS-CR

Cell Cycle DNA

Genetics Classification

Evolution Behavior Ecology

Cells • Prokaryotic- (Pro: NO)

– No nucleus

– Usually unicellular

– Example: bacteria

– Have DNA: not stored in the nucleus

– No membrane organelles

Cells • Eukaryotic (Eu: DO)

– Has Nucleus

– Multicelluar

– Examples: Plants & Animals

– Has membrane organelles, such as mitochondria and chloroplasts

Cells

• Organelles – Nucleus- genetic info (brain of cell) – Cell membrane- selectively permeable (allows things

in & out) – Cell wall- support & protection – Cytoplasm- hold organelles in place – Ribosome- site of protein synthesis – Mitochondria- site of cellular respiration (energy

production) – Chloroplasts- site of photosynthesis (light energy into

chemical energy)

Organization Levels

• Organism – Organ systems

• Organs – Tissue

» Cell

» The basic unit of life –

• Cell (can be broken down further) – Organelles

• Molecules – Atoms

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The eukaryotic organism described above should be classified as —

1.an animal 2.a plant 3.a bacterium 4.a fungus

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Cell Transport

• Diffusion- movement of molecule from an area of [H] -> [L]

– passive transport: no energy required

– Can be liquid or gas

Cell Transport

• Osmosis- movement of H2O from an area of [H] -> [L]

– passive transport: no energy required

– water

Cell Transport • Hypertonic

– Hyper= more

– More solute in the solution than in the cell

– Water leaves cell

– Cell will shrink

Cell Transport • Hypotonic Solution

– Hypo= less

– Less solute in the solution than in the cell

– Water moves into the cell

– Cell could burst

Cell Transport • Isotonic Solution

– Iso= same

– Equal solute in the solution than in the cell

– Water moves into the cell and out of cell equally

– Cell is at equilibrium

Cell Transport • Facilitated Diffusion- movement of larger

molecules from [H] -> [L]

– passive transport: no energy required

Cell Transport • Active transport: is the movement

of molecules across a cell membrane in the direction against their concentration gradient, [L] -> [H]

– requires ATP (energy)

– Modifies protein (changes shape)

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Use the information to answer questions 4-6. A biology student wants to study how animal cells react when places in distilled water and in a salt solution. The student used the following procedure: 1) Place a small sample of cells on a microscope slide and place a cover slip over the sample. Add a few drops of distilled water under the cover slip. 2) Observe the cells in the distilled water solution under a microscope. 3) Place a small sample of cells on a microscope slide and place a cover slip over the sample. Add a few drops of 20% salt solution under the cover slip. 4) Observe the cells in the salt solution under a microscope. 4. What is the dependent variable in this experiment? A the salt concentration B the number of cells in the sample C the type of animal that the cells come from D the movement of water across the cell membrane D salts are moving out of the cells into the surrounding solution

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PS-CR • Photosynthesis

– Occurs in the chloroplasts of plant

– Takes sunlight and convert to glucose (C6H12O6)

– Makes food for itself and animals

6H2O + 6CO2 +SL -> C6H12O6 + 6O2

PS-CR • Cellular Respiration

– Occurs in the mitochondria of the plant or animal

– Takes glucose (C6H12O6) and coverts it into ATP (energy)

– Energy used to grow and other process in cell

– Both plants & animals can go through CR

C6H12O6 + 6O2 -> 6H2O + 6CO2 +ATP

PS-CR • Bromothymol Blue (BTB)

– Indicator for the presence of CO2

– BTB turns yellow in the presence of CO2

– BTB stays blue in the presence of O2

– BTB will turn green if there is both CO2 & O2

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8. Which method should a scientist use to view the site of photosynthesis in a plant cell? A use a magnifying glass to view the chloroplasts B use a magnifying glass to view the mitochondria C use a microscope to view the chloroplasts D use a microscope to view the mitochondria

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44. A scientist wants to measure how much gas is released by a plant to estimate how fast it is photosynthesizing. Which measurement should the scientist take? A meters of carbon dioxide B milliliters of oxygen C grams of carbon dioxide D centimeters of oxygen

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Elodea, a freshwater plant, releases gas bubbles when it is placed in direct light. In an

investigation, a student placed a lamp at different distances from an aquarium containing

Elodea. The student counted the number of bubbles produced by the Elodea plant. His

data are shown in the table below.

The bubbles released by Elodea contain mostly

A. Oxygen

B. Carbon dioxide

C. Nitrogen

D. Water vapor

Cell Cycle

• process in a cell leading to its division and duplication (replication) that produces two daughter cells – M phase: mitosis & cytokinesis (cell division)

• Mitosis (prophrase, metaphase, anaphase, telophase)

– G1 phase: period of cell growth

– S phase: DNA synthesis

– G2 phase: preparation for mitosis

– Interphase -includes G1, S & G2

Mitosis • Cell division

– Used for growth & repair (asexual resproduction)

– Produces 2 daughter cells that are genetically identical

– Chromosome numbers are diploid (2n)

– Somatic cells (body cells)

Meiosis • Cell division

– Used to create sex cells (sexual reproduction)

– Produces 4 daughter cells that are genetically different (genetic variation)

– Chromosome numbers are haploid (n)

– Gamete cells (sperm & egg)

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In the western red lily, Lilium philadelphicum, mitosis produces 24 chromosomes in each daughter cell. How many chromosomes does meiosis produce in each gamete cell of the western red lily? A.6 B.12 C.24 D.48

DNA • Deoxyribonucleic Acid

– Double stranded

– Made up a nucleotide

• Sugar: Deoxyribose

• Phosphate group

• Nitrogen Bases- – Adenine

– Thymine

– Cytosine

– Guanine

Replication • Making a copy of DNA

– Enzyme breaks hydrogen bonds between nitrogen bases

– DNA unzips

– New strand is made

– Follows the rule of complementary pairing

• Adenine matches with Thymine

• Cytosine matches with Guanine

RNA • Ribonucleic Acid

– Single stranded

– Made up a nucleotide

• Sugar: Ribose

• Phosphate group

• Nitrogen Bases- – Adenine

– Uracil

– Cytosine

– Guanine

Protein Synthesis

• Occurs on the ribosomes in the cytoplasm

• The protein design (code) comes from the DNA

• DNA does not leave nucleus so a copy is made (mRNA)

mRNA • Form of RNA that takes genetic info from DNA to

the ribosome for protein synthesis

• If my DNA strand was ATG GCC TTA GTA

• Then the mRNA strand made would be UAC CGG AAU CAU

DNA nitrogen base corresponding RNA nitrogen base T A A U G C C G

Protein Synthesis

Mutations • Can have

– Negative effect

– Neutral effect

– Positive effect (adaptations)

Mutations

Karotypes

• Determines the genes of an individual.

• Able to identify genetic disorders

• Trisomy – 3 chromsomes instead of 2

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Genetics

Alleles – different forms of the same gene

Example: Some alleles for the eye color gene are

• B – Brown eyes

• b – blue eyes

Traits

• Dominant Trait

– Written as a capital letter to show that it is overpowering

• Recessive Trait

– Written as a lowercase letter to show that it can be covered up

• Genotype – The actual allele

combination

– Example: • AA, Aa, or aa

• Phenotype – The physical appearance

which expresses the genetic trait.

– Example:

– brown eyes or blue eyes

• Homozygous

– When the two alleles are the same

– BB or bb

• Heterozygous

– When the two alleles are different

– Bb

Punnett Squares • Predict possible

genotypes of offsprings

– A= red color

– a= blue color

• AA x aa

• 100% of offspring will have a genotype of Aa which will express as a red phenotype

Peidgree

• Tool to look at the passing of certain genetic traits on to offspring based of generations

DNA fingerprint

• Electrophoresis

• technique used to identify a person’s individual DNA

• used in paternity testing and criminal investigation

DNA fingerprint • Can also be used to

determine how closely related two organisms are

Determining Pedigree type

• Autosomal- Traits on passed on somatic cell

• Sex-linked- trait is passed on the X chromosome

Incomplete Dominance • Neither trait wants to be dominates over the

other

• Phenotypes are blended

• Red x White = Pink

Co-dominance • Both traits want to dominant

• Both phenotypes are expressed

• Red x Blue = Red & Blue

Blood types

• Follows the law of dominance and co-dominance

• Type A= IAIA or IAi

• Type B = IBIB or Ibi

• Type AB = = IAIB

• Type O= ii

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17. In a certain group of lab mice black fur is dominant and brown fur is recessive. If two heterozygous mice mate and produce 16 offspring, how many of the offspring will probably have brown fur? A 0 B 4 C 8 D 12

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15. Robert is conducting breeding experiments with mice. He crossed two brown mice and found that 25% of their offspring were white. Which conclusion from this experiment is most logical? A White color is dominant over brown color B One of the parent mice is homozygous for the dominant allele C All of the offspring carry two copies of the recessive allele D The white offspring are homozygous for the recessive allele

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In a species of fly, the allele for red eyes (R) is dominant to the allele for brown eyes (r). Red eye color in the flies is not sex-linked. Students crossed male and female flies that had red eyes and recorded the eye color of their offspring. Their data are shown below.

Using the data in the table, what is the approximate ratio of red-eyed offspring to brown-eyed offspring? A. 1:1 B. 2:1 C. 3:1 D. 4:1

Classification

• groups of organisms on the basis of shared characteristics and giving names to those groups

Broad- includes many individuals

Specific- very small amount of individuals

Classification

• Cladogram- shows relationship between organims

Classification • Dichotomous Key- used to identify unknown

individuals based on specific characteristics

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Which organism in the table is most similar to a tiger (Panthera tigris)?

A. Coyote

B. Grey wolf

C. Blue whale

D. Lion

The Linnean classification system places organisms in groups based on how closely they are related. The kingdom is the classification level containing organisms that are most distantly related while the species level contains organisms that are most closely related. The Linnean classification of the largemouth bass is shown below.

Which of these levels of classification contains organisms that are more

distantly related than those in the order of Perciformes? A. Actinopterygii B. Micropterus C. Centrarchidae D. salmoides

Classification of Largemouth Bass

Kingdom Animalia

Phylum Chordata

Class Actinopterygii

Order Perciformes

Family Centrarchidae

Genus Micropterus

Species salmoides

Which of the following lists the levels of cell organization from least to most complex? A. Organs, cells, organ systems, tissues B. Cells, tissues, organs, organ systems C. Tissues, organs, organ systems, cells D. Cells, organs, organ systems, tissues

Evolution • Adaptation- a mutation that benefits an

individual to survive a certain environment

• Examples

– Blending in with surroundings

– Different beak structures depending on food source

Evolution • Adaptations must happen in the DNA- cannot

development because of a need

• Instead those that have the adaption survive passing on the trait to their offspirng

Wrong

Natural Selection

Evolution • Natural Selection-

organisms better suited to a particular environment survive and produce more offspring than those organisms less fit. – Green beetles more

visible. More are eaten

– Brown beetle more suited for environment- reproduce more.

Evidences of Evolution • Fossil records – see bones of organism once

living that are similar to those living today

• Embryology – see similarities in developing embryos

Evidences of Evolution

• Homologous Structures – have the same structure but not necessary the same function

• DNA analysis – Best indicator for determining are closely related two individuals are.

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Behavior

• Plant behaviors-

– Phototropism: the growth of a plant toward light. Can be positive (towards sun) or negative (away from sun);

– Gravitropism: plant growth in response to gravity. Roots grow down into the soil to anchor.

Behavior

• Animal behaviors- – Innate: behavior born with (hard-wiring)

• reflex: involuntary and nearly instantaneous movement in response to a stimulus (knee jerking when hit at doctors appt)

• instinct: performed without being based upon prior experience (sea turtles returning to sea)

• courtship: performed by male and female before mating (mating dance, flashing patterns, songs/calls)

• migration: seasonal movement of animals (birds/butterfly)

• hibernation/estivation: reduced metabolism during cold/hot periods (bears/frogs)

Behavior

• Animal behaviors-

– Learned: behavior that has been modified based on experience;

• Imprinting: forms a social attachment to another object (hatchlings imprint to mother)

• Trial and error: It is characterized by repeated, varied attempts which are continued until success (nest building, riding a bike)

• Conditioning: learning by association (Pavlov’s dog)

• Insight: learning which animals use previous experiences to respond to new situations (problem solving)

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62. Joshua is studying the mating behavior of hanging flies. Female hanging flies typically require their male mates to bring them a gift, such as a moth to eat. Joshua raised a group of female and male hanging fly larvae in isolation from adult hanging flies. When these larvae became adults, the females also required a gift from their mates. Which explanation is the best for this behavior? A the behavior is acquired randomly B the behavior is learned through imprinting C the behavior is learned through experience D the behavior is inherited through genes

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Ecology • Interactions of organisms and their

environment

Species

• Individuals that are able to reproduce and produce fertile offspring

Variation with a species • Niche – a role a species plays in an area

– What type of food the organism eats, where it lives, how it interacts with other species.

Environmental Factors

• Abiotic Factors- nonliving factors in the environment (sunlight, soil, water, temperature, oxygen, CO2, nitrogen

• Biotic Factora- living factors in the environment (Humans, Animals, dead things, trees)

Symbiosis • The relationship between

two different species living closely together – Predation (one benefits-

one dies)

– Mutualism (both benefit)

– Parasitism (one benefits- one is harmed)

– Commensalism (one benefits- other unaffected)

Predation One organism hunts and feeds on another

organism

Mutualism both species benefit from the relationship

Clownfish live within sea anemones, which normally sting other fish. The fish gets protection, and the anemone benefits because the clownfish keep it clean of bacteria.

Parasitism one organism gains benefits at the other’s

expense

Leech sucks the blood of a human

Commensalism one species benefits and the other is not hurt

nor helped

Epiphytes are plants that grow on other plants without harming them. They never set root in the ground!

Biogeochemical Cycles

• Water cycle

• Carbon cycle

• Nitrogen cycle

Water Cycle

Water Cycle Processes • Evaporation

– Water entering into the atmosphere

• Precipitation

– Water falling from the atmosphere

• Condensation

– Change from water vapor to liquid which usually forms clouds or fog

• Transpiration

– Change from liquid to water vapor usually in plants for movement of water from roots to leaves.

Carbon Cycle

Carbon Cycle Processes

• Photosynthesis – Takes in carbon as carbon dioxide

– Releases carbon as glucose

• Cellular Respiration – Releases carbon as carbon dioxide

• Burning of Fossil Fuels – Releases carbon as carbon dioxide

• Decomposition – Releases carbon as carbon dioxide

Nitrogen Cycle

Nitrogen Cycle Processes

• Ammonification – decomposers releasing nitrogen to the soil

• Nitrification – Bacteria changing ammonia into nitrates

• Denitrification – releasing nitrogen to the atmosphere from nitrates in the soil

• Nitrogen-fixation – plants taking nitrogen directly from the atmosphere and making ammonia

Autotrophs vs Heterotrophs

• AUTOTROPHS

• Two types:

• 1. Photoautotrophs use sunlight to convert energy into glucose

• 2. Chemoautotrophs use the compounds around them to survive.

• AKA producers

• HETEROTROPHS

• AKA consumers

• Organisms that eat other consumers.

Diet Types

• Herbivores – organisms that only eat producers, plants or autotrophs.

• Carnivores – organisms that eat other consumers

• Omnivores – organisms that eat both plants and animals

Food Chain • Simple passage way of energy and nutrients in an

ecosystem

Food Web

• Food web - interconnected food chain to show how species are related in an ecosystem

Ecological Pyramids

• Energy Pyramid: the producers are at the bottom with the total amount of sun energy captured.

• Each trophic level that the energy flows into only receives 10% of the energy from the previous level.

• The other 90% is lost as heat

Pyramid of Numbers

• Population decreases at each level

Pyramid of Biomass • Biomass – amount of living matter

• Natality – Birth rate of organisms in an area

• Mortality – death rate of organims in an area

• Immigration – movement of individuals into an area

• Emigration – movement of individuals out of an area

• Biomass – the amount of living matter in an area

• Population Density – the number of individuals in an area

• Carrying Capacity

– The maximum number of species in an area

• Limiting Factors

– The factor that restricts the growth of an organism • Ex: water, food, space

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An experiment is designed to clear an oak-hickory forest and replant the area with pines. Which of the following species would be most threatened by this experiment?

1.Cardinal 2.Hooded warbler 3.Field sparrow 4.Summer tanager

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This graph shows the sizes of lynx and hare populations between the years of 1845 and 1940. If a predator of the lynx enters the food chain, you might expect the number of —

1.lynx and hares to become equal 2.lynx to increase 3.hares to increase 4.hares and lynx to decrease

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In the graph below, what is the population of deer at the carrying capacity of the environment?

1.30 2.10 3.50 4.70

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This graph suggests that from 1840 to 1920, the carrying capacity for sheep in Tasmania was approximately —

1.0.75 million 2.1.00 million 3.1.75 million 4.2.25 million

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A mushroom and a humpback whale are alike because both are —

1.motile 2.prokaryotic 3.unicellular 4.heterotrophic

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