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Biology 105 (NCSU) | 2026 Updated Study Guide, Practice Questions and Exam Preparation Material

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his document contains study and practice material for Biology 105 at North Carolina State University (NCSU), designed to support student learning and exam preparation in introductory biology. It includes questions covering foundational topics such as cell biology, genetics, evolution, ecology, and basic physiological systems. The material is structured to reinforce core biological concepts taught in first-year university biology courses. It is suitable for revision, practice questions, and exam readiness.

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Biology 105 NCSU
Study online at https://quizlet.com/_euewdv

1. Definition of Life HOMEOSTASIS (maintaining a stable environment within
a cell)

2. Metabolism Making and spending energy to do everything else (to
maintain homeostasis)

3. What is Science? An approach to find an answer to a question

4. Scientific Ques- material, falsifiable
tions Must Be...

5. Approach to col- measurable, observable, repeatable
lect data

6. Answer/Conclu- restrained to strength of Experimental Design
sion (strength)

7. Hypothesis IF (condition), THEN (measurement); possible explana-
tion of an event, based on previous knowledge (An "edu-
cated guess")

8. Independent and condition &
Dependent Vari- measurement
ables

9. Types of Scientif- 1. Observation / Description
ic Approaches 2. Correlation
3. Noncontrolled Experiment
4. Controlled Experiment

10. Designing a Con- 1. AskQuestion
trolled Experi- 2. Make Hypothesis
ment 3. Collect Data
--> How much data?
4. Make Conclusion
--> How strong is it?
--> Is it biased?

11. Junk Science Start with desired Conclusion, then find some supporting
data


, Biology 105 NCSU
Study online at https://quizlet.com/_euewdv


12. PseudoScience • Question NOT material, falsifiable
• Approach NOT measurable, observable, repeatable
• Exciting & sensational

13. Correlations causation
does not equal
_________

14. Fact one piece of empirical data; falsifiable

15. Law narrow, but strong prediction of events under specific
conditions (often a mathematical formula)

16. Scientific Theory broad & strongest explanation supported by a large body
of scientific research, with minimal influence of human
bias.

17. Accept vs. Be- You either ACCEPT or DO NOT ACCEPT that data lead
lieve to a specific conclusion; You do NOT believe in anything
in science

18. Supported vs. You either SUPPORT or REFUTE a hypothesis; Nothing
Proven or True is ever 100% (never "proven" or "true"), but
99% is very strong

19. Permian Extinc- ~250 mya; 95% of all marine species; 70% of land verte-
tion (The Great brates; 80% of insects
Dying)

20. Cretaceous Ex- ~65 mya; Dinosaurs
tinction

21. Holocene extinc- current extinction; ~100,000 species extinct/year;
tion megafauna (~10,000 ya); Amphibians; Plants

22. Classification Domain, Kingdom, Phylum, Class, Order, Family, Genus,
List Species

23. Scientific Names Genus + species = Scientific Name (Italicized)


, Biology 105 NCSU
Study online at https://quizlet.com/_euewdv

24. Grouping one species = one name; organize similar groups into
Species categories

25. Species Defini- A group of organisms capable of breeding in nature, and
tion producing viable offspring

26. Problems with •Only breeding organisms (by sexual means)
Species Defini- •No definition of range for "in nature"
tion •What is a "variety"/"breed" vs. "species"
•Range of characteristics/genetics

27. Scientific Names • Not precise (can refer to many species)
vs. Common • Different common names used in different places; Differ-
Names ent languages
• Common names can refer to different species
• Some species have no common names

28. Why Latin? • Dead language (meaning doesn't change)
• Shorter than detailed description • Used everywhere
• Used forever

29. Three Basic Cell Bacteria (prokaryote), Archaea (prokaryote), Eukaryota
Structures (eukaryote)

30. Domains Bacteria, Archaea, Eukaryota

31. Importance of • Food
Plants • Oxygen
• Ecosystems
--> Base of food chain
--> Hold soil; add nitrogen
• Human Society
-->Agriculture
-->Paper/Books
• Furniture & Clothing
• Medicine

32. First Plants Mosses (500mya); Ferns (300mya); Conifers (200mya);
Flowering Plants (100mya)



, Biology 105 NCSU
Study online at https://quizlet.com/_euewdv
33. Mosses • Most primitive plant
• NO vascular system, roots (cannot grow tall)
• Swimming sperm (need water to reproduce)

34. Vascular Tissue Height=compete for sunlight

35. Ferns • Ferns prominent 300 mya
• Vascular system*
- Allows for tall growth
• Leaves with cuticle & stomata
- Keeps water from evaporating
• Swimming sperm (no pollen)

36. Pollen= sperm

37. Gymnosperms • "Age of Cycads" (200 mya)
(conifers, • Vascular system; Leaves with cuticle & stomata
ginkgo) • Reproduction using pollen & seeds (no fruit)

38. Angiosperms • Widespread ~100 mya
(flowering • Vascular system; Leaves with cuticle & stomata
plants) • Reproduction using pollen & seed
- Symbiotic Dispersal: Flowers & Fruit

39. Flower vs Fruit Flowers= more efficient pollination
Seeds enclosed in Fruit (increased range because this
way uses animals for distraction)

40. Fruit vs Veg- Fruit=anything that grows from the ovary of a flower
etable (contains seeds); Vegetable=anything that grows from the
vegetative part of the plant (not a fruit)

41. All About Plant - Domain Eukaryota
Cells - Kingdom Plantae
- Photosynthesis (chloroplast)
- Lack of movement (cell wall, vacuoles & chemicals)

42. Creatures in the Jellyfish (cnidaria), Worms (3 phyla: flatworms, round-
Kingdom Ani- worms, segmented worms), Molluscs, Arthropods, Echin-
malia oderms, Chordates,

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