Biology EOC Review Pack. The answers. 1) List the characteristics of life. E nergy H omeostasis O rganization R eproduction A daptation & Evolution G rowth & Development A djust to a stimulus. 2) Explain the difference between independent & dependent variables.
Quantitative : quantity : numbers
data presented in graphs
Qualitative : words, descriptions
increased surface area
*Plants, animals, protists, fungi
& electrical signals
15) How do cells maintain homeostasis in:
Water moving in
Red blood cell in distilled water
Water moves in
Water moving out
Red blood cell in strong sugar/salt water
Salt/sugar Sucks! the H2O out = cell shrinks
ATP - Adenosine Triphosphate
ADP - Adenosine Diphosphate
31) What type of fermentation does
yeast use? What might it produce?
O2 + C6H12O6 CO2 + H2O
oxygen carbon dioxide
33) What is chemosynthesis? Where might it be used?
converting chemical energy into glucose; places with no sunlight
34) Equation for Photosynthesis:
CO2 + H2O O2 + C6H12O6
carbon dioxide oxygen
Pulls CO2 out of atmosphere
uses it as a reactant
Decreases global warming
Who does it?
Plants, plant-like protists, algae
Releases CO2 into atmosphere
CO2 is a product
Who does it?
ALL living things
Plants, plant-like protists, fungi, animals, bacteria…
Where: mitochondria35) Describe the role of photosynthesis and cellular respiration in the carbon cycle.
37) Draw & label a DNA strand 2 nucleotides long.
is where it’s
39) What type of bond is formed between the bases in DNA? Why is it important?
Weak Hydrogen bonds
Unzip easily for DNA replication & transcription
b. What is the role of mRNA?
c. What is the role of tRNA?
43) What are 3 main differences between DNA and RNA:
44) When in the cell cycle does DNA replication occur? Where in the cell does it happen?
46) What is Translation and where does it happen?
47) What is a codon?
tRNA48) Draw an animal cell and show the processes starting with DNA and finishing with protein synthesis.
amino acid to ribosome
Original: TAC CGA CCT GGG TAT ATG ACT
Complementary: ATG GCT GGA CCC ATA TAC TGA
50) Use the original DNA above to make an mRNA strand:
Original: TAC CGA CCT GGG TAT ATG ACT
mRNA: AUG GCU GGA CCC AUA UAC UGA
mRNA: AUG GCU GGA CCC AUA UAC UGA
Met Ala Gly Pro Ile Tyr Stop
What causes it? Over- or underproduction, or production of proteins at the wrong times
Give examples of 3 types of cancer & explain their known causes.
*gametes (sex cells)
*so a species can survive in changing environment
*so organism can grow
chromosomes separate at centromeres, begin to move to poles
chromosomes line up at equator
4th: chromosomes move
cell begins to pinch
1st: nuclear envelope dissolves; centrioles appear; chromatin coils up = chromosomes
Remember: puppy PMAT!
a. Diploid: 2n; has 2 sets of chromosomes
b. Haploid: n; has 1 set of chromosomes
56)a. What is crossing over? Exchange of genetic material in meiosis
b. When does crossing over occur? During Prophase I of meiosis
c. What’s the benefit of crossing over? Genetic variation=survival of the species
How does it increase variation? New genetic combinations
This diagram shows a diploid cell with two pairs of homologous chromosomes. Due to independent assortment, what is the possible genetic makeup of gametes produced?
ST, St, sT, st
(find all possible combinations of letters)
Define and give an example of each (with before and after mutation). Before After
Point mutation: substituting one N base for another
GGA TCG GGG TCG
Frameshift mutation: inserting or deleting one N base; changes entire strand from that point
GGA TCG GGA TAC G
How do mutations increase variation? Allows for genetic diversity=raw material for natural selection
How does it increase variation? Get more different combinations of alleles
60) How can reproductive variations benefit a species?
More variations = More chances species will survive during in a changing env.
What does it cause? Trisomy 21 = 3 chromosomes at pair 21 (down syndrome)
62) Define fertilization. Sperm & egg fuse together.
2 dominant alleles: TT 2 recessive alleles: tt
1 dom. & 1 rec.: Tt
LL=long L’L’=short, LL’=medium
64) Using the diagram, what is the:
25% II, 50% Ii, 25% ii
65) Two heterozygous tall pea plants are crossed. If tall is dominant to short, what are the expected phenotypic results?
3 tall: 1 short
Mr. Jones & Mrs. Jones
66) Blood Type question (Multiple Alleles): Mr. Jones has blood type A and Mrs. Jones has blood type AB. What is the chance that they will have a child with blood type A if both of Mr. Jones’s parents were AB?
Mr. Jones: A (IAIA or IAi)
Mrs. Jones: AB (IAIB)
Mr. Jones’ parents
67) Is it possible to have a child with type O blood if one parent is type A and the other is type B? Use a punnett square to prove your answer.
Yes it is
68) Color blindness is a sex-linked recessive trait. A mother with normal color vision and a colorblind father have a colorblind daughter. What does this conclude about the mother?
N: Normal vision
The mother has to be a carrier (heterozygous for colorblindness)
69) Two healthy parents have a child with cystic fibrosis. Use a punnett square to explain how this happened. What are the chances they will have another child with cystic fibrosis?
n: cystic fibrosis
Child with cystic fibrosis
25% chance of having another child with cystic fibrosis
70) A woman is diagnosed to be heterozygous for Huntington’s. Her husband is healthy. What are the chances their children have the disorder?
Hh or HH
71) A man is resistant to malaria. His wife has sickle cell anemia. What are the chances their children could be resistant to malaria?
n: sickle cell anemia
72) In chickens, feather color is co-dominant. One allele codes for black and another allele codes for white. The heterozygous bird is checkered. Cross two checkered birds. What is the phenotypic ratio that results?
BB: Black feathers
WW: White feathers
BW: checkered chicken
25% Black: 50% checkered: 25% white
73) In snapdragons, flower color is inherited by incomplete dominance. There is a red allele, a white allele, and the heterozygous is pink. What is the phenotypic ratio if you cross a white flower with a red flower?
74) Use the pedigree showing inheritance of hemophilia to answer the following questions:
*Remember: you may have to complete a Punnett square to answer the question correctly.
a. What is the genotype of individual I-1?
b. What is the genotype of individual I-2?
c. What is the phenotype of individual III-1? What is their genotype?
75) Black is dominant in rabbit fur color. Suggest a test cross to determine a black rabbit’s genotype if mated with a white rabbit, it has 14 offspring: 7 black & 7 white.
Test Cross: cross a known:
(homozygous recessive = white fur)
with the unknown; look at offspring
½ of offspring are black; ½ are white
Genotype of unknown black must be Bb
All black offspring
Give three examples. Height, skin color, eye color
77) Describe Gregor Mendel’s pea plant experiments. Tall pea + short pea = all tall (principle of dominance)
78) Why are males more likely to express a sex-linked disorder? Have only 1 X chromosome; if male gets 1 allele for disorder has no way to mask it
**Can see gender & chromosomal disorders (down syndrome)
84) How can genetic engineering allow us to produce human insulin using bacteria? Isolate insulin gene; insert into bacteria; bacteria clone gene
(red cat has
1.Cut DNA w/ restriction-enzyme. Put
fragments into gel.
3. Result: DNA fingerprint
2. Add electricity.
Shorter fragments move farther
b. How was it prepared? gel electrophoresis
c. Based on the evidence (Evs), who is guilty – suspect 1 or 2? Suspect 2
90) What is the Human Genome Project? Complete mapping of all genes in human genome
Why is it useful? To ID people with genetic disorders early (prevention/treatment); find cures for disorders
92) What did Louis Pasteur contribute to our understanding of the origins of life? Disproved spontaneous generation of microorganisms (broth experiments)
94) How did early Earth’s conditions contribute to the development of life? No free O2 = first organisms anaerobic & simple (prokaryotic)
95) Explain the evolution of eukaryotic cells and aerobic organisms. (Endosymbiont Theory) evolution of prokaryotic cells to eukaryotic cells
(aerobic bacteriamitochondria; cyanobacteriachloroplast)
Where do you find the oldest/youngest fossils? Oldest in bottom layer; youngest on top
97) Which is more accurate – relative dating or radiometric dating? Explain each concept briefly. Relative dating uses rock layers; Radiometric: uses radioactive isotopes
Which is referred to as absolute dating? Radiometric dating
They all evolved from a common ancestor because of similar arrangement of bones.
100) How are variation and natural selection related? Variations are raw material for natural selection to happen
101) What is the role of geographic isolation in speciation? Physical barrier separating individuals of a population; they no longer interbreed = produce two species
102) How does the environment select adaptations? Individuals with adaptations best suited to environment survive, reproduce, pass on genes
103) Define the following and explain how they are related to natural selection:
* Pesticide Resistance – organisms with resistant genes survive, reproduce, pass on genes
* Antibiotic Resistance – bacteria with resistant genes survive, multiply, pass on genes (MRSA, TB)
105) Based on the cladogram, which are more closely related – bacteria and marsupials or birds and marsupials?
107) Who came up with the two word naming system? Carolus Linnaeus
What is this naming system called?
2-name name- system
108) Name the 8 levels of our current classification system starting from largest (most similarities) to smallest (most specific).
113) Animals: multicellular, eukaryotic, heterotrophic
a. Chordata –
i. Mammals: have hair, mammary glands, internal fertilization, & are endothermic
ii. Amphibians: “double life”; spend part of their life in water and part on land; ectothermic; external fertilization; go through metamorphosis
b) Arthropoda- “jointed appendages”
* Insects – 3 body segments; 6 legs; exoskeleton made of chitin; mostly internal fertilization; open circulation system
c) Annelida- Segmented worms; breathe & excrete wastes through skin; bilateral symmetry; also use nephridia to excrete waste
a) Nonvascular plants: Mosses- do not contain vascular tissue (xylem & phloem); must grow near water; reproduce with spores
b) Gymnosperms (conifers) – “naked seed”; seeds are enclosed in cones; have needles instead of leaves; have vascular tissues (xylem & phloem)
c) Angiosperms- flowering plants; produce seeds enclosed in fruits; vascular tissue
“Xy” goes high
“Phlo” goes low
Increased surface area=increased activity (helps maintain homeostasis)
116) What adaptations are necessary for plant life on land?
Vascular tissue, pollination must occur; seeds/spores dispersed by abiotic/biotic factors (wind/water/animals);
118) What are xylem and phloem? Vascular tissue
What do they do? Xylem moves water up from roots to leaves;Phloem moves sugar from leaves to roots
“Xy” goes high
“Phlo” goes low
120) What adaptations do plants have to ensure reproductive success? pollen/attractive flower colors, fragrance, fruit, open time, nectar amount
122) Describe the following disease causing pathogens. Are they a virus or bacteria? Which should be treated with antibiotics?
a. HIV – virus; causes AIDS
b. Influenza – virus; causes flu
c. Small Pox – virus
d. Streptococcus (strep throat) – bacteria; treat w/ antibiotics (the only living pathogen on this slide)
a. Sickle cell anemia and malaria: carriers resistant to malaria
b. Lung/mouth cancer & tobacco use tobacco causes mutations cancer
Type I is genetic
Type II: can be genetically predisposed, BUT proper diet/exercise can help treat
e. PKU and diet – genetic disorder diagnosed at birth; proper diet prevents mental retardation
125) Passive vs. Active Immunity – passive-get from mother at birth; temporary; active-encounter antigens, antibodies are formed in response
126) What are vaccines and how do they work?Weakened form of pathogen; causes antibody & memory cell production to fight off future invasions
Symptoms: chills, fever, aches, fatigue
Treatments: used to be Chloroquine, but parasite evolved resistance
Causal organism: protist: Plasmodium
a. Lead – causes learning disabilities (ADD); birth defects
b. Mercury – biomagnification; birth defects from infected fish
a. Phototaxis (positive/negative) – positive: Euglenas move toward light; negative: squinting in bright light; rolly pollies run away when turn over log
b. Suckling – innate behavior to find nourishment immediately following birth
c. Migration – seasonal movement for breeding/feeding grounds
d. Estivation – decreased metabolic activity thru drought
e. Hibernation – decreased metabolic activity thru winter
a. Habituation- get used to repetitive behavior b/c no negative consequence
b. Imprinting – forms a permanent attachment to mother upon hatching; helps recognize appropriate mate
c. Classical Conditioning- Pavlov’s dogs; learning by association
d. Trial and Error- random; proper response is rewarded
c. Territorial Defense- males fight males of same species; strongest, best adapted male gets to mate
a) Phototropism – leaves/stems bend toward light (positive response)
b) Thigmotropism – response to touch; causes vining
c) geotropism/gravitropism – leaves/stems respond negatively to gravity pull; roots respond positively
135) List the levels of ecological organization from smallest to largest:
*Single of a species
*Group of organisms,
*All living things
in an area
*Biotic & abiotic
factors in an area
*Portion of earth
where all life is
Define and give an example of the following symbiotic relationships.
ex: barnacles on a whale
ex: fleas on a dog
d. What type of symbiosis could Nitrogen fixation represent? Explain. Mutualism: nitrogen-fixing bacteria on plant roots get glucose, plant gets N in a form it can absorb
examples: food, disease, predators, space
# of organisms
abiotic = nonliving factors
ex: air currents, temperature, light, soil, moisture; pH
biotic factors = living factors
How are they related?
interdependent in ecosystems
Why are they important in ecosystems?
abiotic factors = shelter, resources needed for survival
biotic factors = all organisms depend on others for food, shelter, reproduction and/or protection
linear diagram showing feeding relationship
Draw a food chain including the following organisms: heron, minnow, plankton Plankton minnow heron
141) How much energy is passed from one trophic level to the next?10%
What happens to the rest?
lost as heat
Draw & label a
2°C, 3°C, Carn.
Where would you find bacteria in the food web & what is its primary role? At all levels; decomposer
Where would you find fungi in the food web & what is its primary role? At all levels; decomposer
143) What are some factors that influence birth and death rates in the human population?Disease, sanitation, availability of resources, education of women
Pre-Industrial revolution = slow growth
Post-Industrial revolution = exponential growth
What does it indicate about possible future growth? Continue to grow exponentially
reduce availability of resources
resources are quickly used & polluted; disease spreads quickly
Future generations will have fewer
resources available to them
Plants & Animals release CO2 as a waste product of respiration
ii. How have humans impacted the carbon cycle? Increased carbon emissions.
Deforestation = less carbon removed thru photosynthesis
What impact does deforestation have?
Habitat loss = Biodiversity loss
Discuss habitat fragmentation.
Separation of wilderness areas from other wilderness
Can cause edge effects; extinction; difficult for animals to find food/mates; overall species diversity declines
a. What are some biological alternatives to chemical pesticides?Biological controls: natural predators (ladybugs, praying mantis, spiders) eat pests
What are the pros and cons?
Pro = reduction of harmful chemicals in our food/environment; beneficial organisms are not affected
Cons = food is more expensive
c. Explain bioaccumulation and biomagnification.
Bioaccumulation – harmful chemicals build up in fat tissues
Biomagnification – organisms at the top of the food chain/web have more of the harmful chemical in their bodies
Ozone molecules are broken apart; allows greater # of harmful UV rays to penetrate our environment
What causes it and why is it a problem?
Increased UV causes skin mutations
Habitat preservation (Yellowstone), recycling, reintroduction programs, ecotourism, laws to protect endangered species