Exam (elaborations)
IB 150 Exam 1 With Complete Solutions Latest Update
- Course
- IB 150
- Institution
- University Of Illinois - Urbana-Champaign
IB 150 Exam 1 With Complete Solutions Latest Update
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Solution 2024/2025Pepper
IB 150 Exam 1 With Complete Solutions Latest
Update
Biological science ANS✔✔ The study of life
Organism ANS✔✔ A living entity made up of one or more cells
5 fundamental characteristics of an organism ANS✔✔ 1. Cells
2. Replication
3. Information
4. Energy
5. Evolution
Hypothesis ANS✔✔ A testable statement based off of scientific theory
Theory ANS✔✔ A hypothesis that has been tested with a significant amount
of data
Experiment ANS✔✔ Allow researchers to test the effect of a single
Independent variable ANS✔✔ Variable being manipulated
- on the x axis
, Solution 2024/2025
Pepper
Dependent variable ANS✔✔ Variable being measured, depends on
independent variable
- on the y axis
Orders of increasing complexity ANS✔✔ 1. Organic molecules
2. Organelles
3. Tissues
4. Organs
5. Organisms
Cell ANS✔✔ Fundamental unit
- Semipermeable membrane that surrounds a space that contains various
organic molecules inside that
Homeostasis ANS✔✔ Organisms maintain a stable internal environment that
is distinct from the external environment
How does an organism maintain homeostasis? ANS✔✔ Work against the
natural flow of energy
- Endergonic reactions
Kinetic energy ANS✔✔ Energy of motion
Potential energy ANS✔✔ Energy that is stored in a population
, Solution 2024/2025
Pepper
1st law of thermodynamics ANS✔✔ Energy cannot be created or destroyed
Enthalpy (H) ANS✔✔ Total energy in a molecule
Exothermic ANS✔✔ Reaction releases heat
- Products have less PE than reactants
- delta H-
Endothermic ANS✔✔ Heat is taken in during the reaction
- Products have more PE than reactants
- delta H+
Second Law of Thermodynamics ANS✔✔ The total entropy always increases
in a system that includes the surroundings as well as the products of the
reaction
- Consequence: nothing can be 100% effiicient
Entropy (S) ANS✔✔ Amount of disorder of any system
Equilibrium ANS✔✔ maximum disorder
Less order ANS✔✔ delta s is positive
- more disorder from reactants to products
More order ANS✔✔ delta s is negative
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