Biology Unit 1 study games — Introduction to Biology.
This unit covers scientific method, characteristics of life and biochemistry — essential concepts for Biology. Use our interactive study games to test your understanding, or review questions in traditional format below.
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This unit covers scientific method, characteristics of life and biochemistry — essential concepts for Biology. Use our interactive study games to test your understanding, or review questions in traditional format below.
Key Concepts Breakdown
1 Scientific Method
Students must understand the steps of the scientific method in order and be able to identify each component in a given experiment. The difference between a hypothesis and a theory, and between independent, dependent, and controlled variables, is frequently tested. Students must also distinguish between qualitative and quantitative observations.
Key Points
- Steps in order: observation → question → hypothesis → experiment → data analysis → conclusion
- A hypothesis is a testable, falsifiable prediction (if-then format); a theory is a well-supported explanation backed by repeated testing
- Independent variable: what the scientist changes; dependent variable: what is measured; control group: baseline with no manipulation
- Quantitative data = numbers/measurements; qualitative data = descriptions using senses
A student notices plants near a window grow taller than plants in a dark corner. She hypothesizes: 'If plants receive more light, then they will grow taller.' She grows 10 plants under bright light and 10 under dim light, watering all equally. After 2 weeks she measures height.
The independent variable is the amount of light, because the student deliberately changes it. The dependent variable is plant height, because it is being measured as a result. The amount of water is a controlled variable kept the same to ensure light is the only factor affecting the outcome.
2 Characteristics Of Life
Students must be able to list and define all eight characteristics of life and apply them to determine whether something is considered living. Exam questions often present an unusual example (virus, fire, crystal) and ask students to evaluate it against the characteristics. All eight must be present for something to be classified as alive.
Key Points
- The 8 characteristics: made of cells, reproduces, grows and develops, responds to stimuli, uses energy (metabolism), maintains homeostasis, has heritable DNA, evolves as a population
- Viruses are NOT considered living because they cannot reproduce or carry out metabolism independently
- Homeostasis = maintaining a stable internal environment (e.g., body temperature, blood sugar)
- All living things are made of one or more cells — the cell is the basic unit of life
A student argues that fire should be classified as living because it grows, consumes energy, and responds to wind. Is fire alive?
Although fire displays a few life-like behaviors, it fails most characteristics: it is not made of cells, does not contain DNA, cannot reproduce, and does not maintain homeostasis. Meeting only some criteria is not sufficient — all eight characteristics must be present for something to be considered alive.
3 Biochemistry
Students must know the four macromolecules (carbohydrates, lipids, proteins, nucleic acids), their monomers, and their primary functions. Understanding how polymers are built through dehydration synthesis and broken down through hydrolysis is essential. The structure and function of water and its properties are also commonly tested.
Key Points
- Carbohydrates: monomer = monosaccharide (e.g., glucose); function = quick energy and structural support (cellulose)
- Proteins: monomer = amino acid; function = enzymes, structure, transport, cell signaling
- Lipids: not polymers; made of glycerol + fatty acids; function = long-term energy storage, cell membranes
- Nucleic acids: monomer = nucleotide; DNA stores genetic information, RNA helps build proteins
During digestion, a starch molecule (a polysaccharide) is broken down into individual glucose molecules. What type of reaction is this, and what is added?
This is a hydrolysis reaction, in which water molecules are added to break the covalent bonds between glucose monomers. The prefix 'hydro' means water and 'lysis' means to break — each bond broken requires one water molecule. The reverse process, linking monomers together by removing water, is called dehydration synthesis.
Questions, answered.
What is Introduction to Biology?
Introduction to Biology is Unit 1 of Biology, covering scientific method, characteristics of life and biochemistry.
How to study for Biology Unit 1?
Start with the Quick Summary above, review the Key Concepts, then test yourself with our interactive study games. Aim for 80%+ accuracy before moving on.
How many questions are in this unit?
This unit has 25+ review questions across 5 different game modes.