1. EOC PRACTICE EXAM
MOST MISSED QUESTIONS

2. 2. A person with swollen gums rinses his mouth with warm salt water, and the swelling decreases. Which has occurred?
The swollen gums have absorbed the saltwater solution
The saltwater solution lowers the temperature of the water in the gums
The salt in the solution has moved against the concentration gradient
The water in the gums ahs moved from a high to low concentration of water
D. The water in the gums has moved from a high to low concentration of water

3. 3. Which organelle is the site where amino acids are synthesized into proteins?1 2 3 4
B. 2… RIBOSOMES are where proteins are made…they can be attached to the endoplasmic reticulum 2 1 4 3

4. ANSWERS TO QUESTIONS 1-9
B D C
D A C
3. B D B

5. 10. What process produces many variations in phenotype?
Independent assortment
Asexual reproduction
Regeneration
cloning
A independent assortment

6. INDEPENDENT ASSORTMENT…each chromosome separates independently of other chromosome pairs

7. 11. One parent has PKU (phenylketonuria), which is caused by recessive alleles. The other parent does not have PKU alleles. What is the chance that the couple will have a child with PKU?
P P 0%
50%
25%
100%
Parent with PKU would
have to be homozygous
Recessive… pp
Parent without PKU alleles
Would have to be
homozygous
Dominant… PP Pp p
A…O%

8. 14. Which plant is most likely a gymnosperm?
Vascular tissue
Seeds
Flowers
cones 1 X 2 3 4
PLANT 1 because it contains cones…
Gymnosperms contain cones
Angiosperms produce flowers
Ferns are vascular plants that don’t produce seeds
Nonvascular plants (like mosses) don’t have vascular tissue (xylem & phloem)
Plant 1
Plant 2
Plant 3
Plant 4

9. 16. If the xylem in a young tree is damaged, which process is first affected?
Performing photosynthesis
Transporting sugar to roots
Transporting water to the leaf
Absorbing water from the soil
C. Transporting water to the leaf

10. 17. A plant species lives in an area with limited sunlight
17. A plant species lives in an area with limited sunlight. Which adaptation would be most useful to the plant?
Colorful flowers
Large leaves
Deep roots
Thin cuticle
A. LARGE LEAVES

11. 20. Which substance is considered to be a factor affecting the Earth’s ozone layer?
Chlorofluorocarbons (CFCs)
Ethyl alcohol
Nitrogen gas
Water vapor
A. chloroflurocarbons

12. ANSWERS TO QUESTIONS 10-20
A A D
A C B
C C A
D B

13. 24. What is represented by A?
Substrate
Product
Enzyme
complex
Substrate….
notice “A” changes by end of reaction….structure B/C/D is the enzyme & does not change throughout the reaction

14. B. Only species Y is anaerobic
25. Two different species of bacteria are examined. Scientists find that Species X always produces CO2 and H20 during cellular respiration. Species Y always produces ethyl alcohol and Co2. Which conclusion can be made from these observations?
Only species Y is aerobic
Only species Y is anaerobic
Both species X & Y are aerobic
Both species X & Y are anaerobic
B. Only species Y is anaerobic

15. 29. Which is a used of genetically engineered bacteria?
Identifying the remains of an unknown person
Developing a DNA fingerprint for blood left at a crime scene
Making human insulin for diabetes
Producing corn that is resistant to herbicides
C. Making human insulin for diabetes

16. ANSWERS TO QUESTIONS 21-31
21. C B C
22. C B B
23. D A D
24. A A

17. 36. After initial infection, B cells recognize the measles virus
36. After initial infection, B cells recognize the measles virus. How is this helpful in the human immune response?
The B cells use this recognition to defend the body against other pathogens, such as bacteria
The B cells more quickly recognize & respond to any other virus that invades the body
The B cells produce antibodies more quickly if the measles virus is encountered again
The B cells transfer this recognition to T- cells, which will then devour the viruses.
C. The B cells produce antibodies more quickly if the measles virus is encountered again

18. 39. A scientist performs an experiment to see if acid rain have an effect on the health of a particular type of plant. Threes sets of plants werw treates with acidic solutions of known pH while the control set was treated with a solution of neutral pH7
Acid has no effect on the health of this type of plant
High acidity is helpful to this type of plant
Low acidity is harmful to this type of plant
High acidity is harmful to this type of plant

19. C. Low acidity is harmful to this type of plant
All 10 plants are dead at pH of 2 No plants died at pH of 7. No evidence that high pH is helpful…we just see that plants did not die at the higher pHs

20. ANSWERS TO QUESTIONS 32-40
32. A D A
33. D C C
34. B B C

21. 50. A cloned plant has a diploid chromosome number of 12
50. A cloned plant has a diploid chromosome number of 12. what is the diploid chromosome number of the plant cell that was used to produce the cloned plant? 6 12 18 24 12

22. ANSWERS TO QUESTIONS 41-50
41. D D D
42. A C D
43. B A B
44. C

23. 51. Due to independent assortment, what is the possible genetic make up of gametes produced by this organism
SsTt
Ss, Tt
S, s, T, t
ST, St, sT, st
D. ST, St, sT, st

24. 57. Which sequence shows increasing ecological levels of organization?
Organism…population…community… ecosystem
Ecosystem…population…organism...
community
Community…ecosystem…population … organism
Population…organism…ecosystem…

25. A. Organism: population: community: ecosystem

26. 60. What will most likely happen if decomposers are removed from the carbon cycle?
The amount of carbon dioxide in the atmosphere will increase
The amount of carbon dioxide in the atmosphere will decrease
The amount of carbon dioxide used by producers will increase
The amount of carbon dioxide needed by consumers will decrease

27. B. The amount of carbon dioxide in the atmosphere will decrease
Decomposition released carbon dioxide into the atmosphere…
So if decomposers are removed…
no decomposition…
less carbon dioxide going into atmosphere

28. ANSWERS TO QUESTIONS 51-60 51. D 55. C 58. B 52. C 56. C 59. B
53. A A B
54. C