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WorksheetsBiology Fall Final Review 2025
Total questions: 90
Worksheet time: 45mins
Which statement best defines an independent variable in an experiment?
Factor kept the same across all groups
Baseline condition used for comparison only
Factor changed on purpose by the researcher
Factor measured as the outcome effect
In a typical graph of experimental results, which variable is placed on the y-axis?
Constant held unchanged
Control group baseline
Independent variable manipulated
Dependent variable measured
What is the primary role of a control group?
Eliminates the need for constants
Contains all manipulated variables
Serves as the baseline for comparison
Provides the measured outcome
Which description best matches a hypothesis?
Unchangeable factor in every trial
Testable scientific explanation
Final conclusion after data analysis
Measured response variable
During an osmosis egg lab, students use plain water while other groups add salt solutions. What is the independent variable?
Type of solution added
Temperature kept constant
Mass of the egg measured
Presence of a control group
Which scenario correctly identifies the dependent variable?
Soil type kept the same
Growth rate recorded over time
Students select plant species
Researcher changes light intensity
Why are constants necessary in an experiment?
They provide the outcome effect
They isolate the cause being tested
They change between treatments
They replace the control group
A student states, “If fertilizer concentration increases, then tomato height will increase.” What element of experimental design is this?
List of experimental constants
Description of a dependent variable
Hypothesis predicting results
Control group statement
Which tool is best for accurately measuring 25 mL of liquid in a biology lab?
Beaker for rough volume
Graduated cylinder precise
Balance for mass only
Thermometer for temperature
When concluding an experiment, what should the conclusion always refer back to?
Names of group members
Set of measurement tools
Original hypothesis tested
List of controlled constants
Which setup demonstrates a valid control group when testing the effect of caffeine on heart rate?
Participants drink water
Participants choose dosages
Participants exercise first
Participants switch brands
Which lab glassware is best for precise liquid measurement during experiments?
Erlenmeyer flask for swirling
Graduated cylinder for measurement
Test tube for small reactions
Beaker for approximate mixing
A beaker is primarily used for which task in a biology lab?
Measuring mass precisely
Heating genetic material
Mixing and rough volumes
Exact volume measurement
Test tubes are most appropriate for which scenario?
Running small-scale reactions
Recording long-term data
Weighing powdered samples
Titrating precise volumes
Which glassware is most accurate for volume measurement?
Flask with conical shape
Graduated cylinder with markings
Test tube with narrow body
Beaker with wide opening
Why must graph axes include unit labels?
To make lines straighter
To increase the number of points
To reduce measurement errors
To clarify what quantities mean
On a line graph of enzyme activity versus temperature, which axis should show temperature with units?
Y-axis showing temperature
X-axis showing temperature
Legend showing temperature
Title showing temperature
Which macromolecule typically provides quick energy at about 4 calories per gram?
Proteins for muscle contraction
Lipids for long-term energy
Nucleic acids for information
Carbohydrates for quick energy
What is the monomer of proteins that forms enzymes?
Monosaccharides units
Amino acids subunits
Nucleotides bases
Fatty acids chains
Which macromolecule has the highest energy yield around 9 calories per gram?
Lipids with fatty acids
Proteins with enzymes
Nucleic acids like DNA
Carbohydrates like starch
Which macromolecule stores genetic information?
Proteins in muscles
Lipids in membranes
Carbohydrates like glucose
Nucleic acids like DNA
Which macromolecule is digested first for energy in most diets?
Lipids for long-term reserve
Proteins for structure roles
Carbohydrates for quick fuel
Nucleic acids for heredity
Which macromolecule directly enables muscle contraction and forms enzymes?
Carbohydrates providing energy
Lipids storing fatty acids
Proteins built from amino acids
Nucleic acids storing genes
Which macromolecule has many cellular roles but is not mainly used for energy?
Lipids for long-term storage
Carbohydrates for rapid energy
Proteins for diverse functions
Nucleic acids for information
Which organelle primarily produces ATP for the cell?
Mitochondria perform cellular respiration to make ATP
Lysosome releases ATP during waste digestion
Nucleus generates genetic code for energy
Cell membrane pumps ATP across lipid bilayer
Which structure controls what enters and leaves the cell?
Flagella block unwanted molecules at surface
Cell membrane forms selective permeability barrier
Mitochondria regulate membrane channels
Nucleus manages cytoplasm traffic directly
Which organelle digests worn‑out parts and foreign material?
Nucleus recycles proteins with ribosomes
Flagella sweep debris into vacuoles
Lysosome contains hydrolytic enzymes for breakdown
Mitochondria oxidize debris into ATP
Which structure primarily moves a cell through fluid?
Lysosomes push the membrane forward
Nucleus directs motion via pores
Flagella act as propelling whip‑like appendages
Mitochondria rotate the cytoskeleton
Which structure stores DNA in eukaryotic cells but not in prokaryotes?
Cell membrane packages DNA into vesicles
Flagella carry DNA in their microtubules
Mitochondria house all genetic material
Nucleus encloses chromosomes in a membrane
Which principle of cell theory states that all organisms are composed of cells?
All living things are made of cells
Cells are the basic unit of life
All cells come from preexisting cells
Cells arise spontaneously from chemicals
Which principle explains why a scraped knee heals over time?
All living things are made of cells
All cells come from preexisting cells
Cells function only when specialized
Cells are the basic unit of life
Which statement describes the basic unit of life?
Membranes are the primary living unit
Tissues are the smallest living structures
Cells are the fundamental unit of life
Organelles are independent living organisms
Which scientist first observed cork cells under a microscope?
Louis Pasteur using fermentation studies
Robert Hooke using early compound microscopes
Anton van Leeuwenhoek with hand‑built lenses
Theodor Schwann investigating animal tissues
A cell increases ATP demand during exercise. Which organelle’s activity should rise first?
Nucleus initiating mitosis for energy
Cell membrane thickening to store ATP
Mitochondria boosting cellular respiration
Lysosomes accelerating macromolecule digestion
If a cell’s lysosomes are defective, which outcome is most likely?
Complete halt of ATP production immediately
Loss of DNA from the nucleus membrane
Membrane becomes fully impermeable
Accumulation of waste and damaged organelles
A bacterium swims rapidly. Which structure most directly causes this movement?
Multiple nuclei driving locomotion signals
Mitochondria powering flagellar rotation directly
Flagella propelling the cell through liquid
Cell membrane forming cilia for propulsion
Which feature distinguishes eukaryotic cells from prokaryotic cells?
Presence of a membrane‑bound nucleus
Entire absence of a cell membrane
Ability to digest waste using lysosomes
Exclusive possession of mitochondria always
Which choice best links an organelle to its function?
Cell membrane — stores all genetic material
Mitochondria — produce ATP via respiration
Nucleus — controls traffic across membrane
Flagella — digest worn‑out cellular parts
Which statement best defines diffusion in cells?
Passive movement of small molecules down gradient
Active pumping of ions against concentration gradient
Bulk vesicle transport bringing materials into cell
Selective passage of water through protein channels
What is osmosis?
Passive movement of water across a membrane
Active transport of glucose using ATP energy
Endocytosis of large particles into the cytoplasm
Exocytosis releasing proteins to extracellular space
Which transport process requires ATP to move substances against a gradient?
Facilitated diffusion via carrier proteins
Active transport across the plasma membrane
Osmosis through aquaporin channels
Diffusion through the lipid bilayer
A cell placed in a hypotonic solution will most likely
Rapidly exocytose solutes to balance
Gain water and swell over time
Remain stable with no net change
Lose water and shrink significantly
A cell in a hypertonic solution tends to
Lose water and shrink in volume
Absorb solutes via passive diffusion
Gain water and swell noticeably
Stay unchanged due to equal solutes
In an isotonic environment, a cell will
Use ATP to force water inward
Lose water until cytoplasm collapses
Gain water until the membrane bursts
Maintain stable volume with no net water flow
Which statement best describes endocytosis?
Water movement through semipermeable membranes
Release of cellular products to extracellular space
Passive movement of gases across phospholipids
Energy-using process bringing materials into cell
Which process is defined as exocytosis?
Carrier-mediated movement without ATP usage
Water diffusion across a semipermeable barrier
Passive entry of ions following concentration gradient
Energy-dependent expulsion of materials from cell
Stem cells are unique because they
Have impermeable membranes to solutes
Contain more mitochondria than other cells
Are undifferentiated and can specialize
Always divide by meiosis in adult tissues
Which scenario shows diffusion rather than osmosis?
Oxygen moving from high to low concentration
Water entering a vacuole through aquaporins
A vesicle fusing to release hormones
Sodium pumped inward using ATP energy
A scientist places red blood cells in a solution with lower solute concentration than the cytoplasm. Predict the outcome.
Cells remain unchanged due to equality
Cells actively pump water to maintain
Cells shrink as water exits cytoplasm
Cells swell as water enters by osmosis
Which choice correctly contrasts passive transport with active transport?
Passive targets macromolecules; active targets water
Passive does not require ATP; active does
Passive uses vesicles; active uses channels
Passive moves up gradient; active moves down
Which statement best defines an enzyme in cellular reactions?
Carrier that stores energy released by reactions
Molecule that raises activation energy for reactions
Protein catalyst that lowers activation energy
Reactant consumed to start a chemical reaction
What is activation energy in a chemical reaction?
Energy stored inside the enzyme
Energy needed to start the reaction
Energy released when bonds form
Energy absorbed by endothermic products
In enzyme activity, what is a substrate?
Reactant the enzyme acts on
Energy carrier for the reaction
Protein that shapes the active site
Product formed after catalysis
Which description matches the lock-and-key model of enzymes?
Substrate fits the enzyme's active site
Active site binds every molecule equally
Enzyme changes shape randomly each time
Substrate breaks the enzyme permanently
Which process absorbs energy overall?
Endothermic reaction
Activation energy step
Exothermic reaction
Catalyzed reaction
Which process releases energy overall?
Exothermic reaction
Endothermic reaction
Lock-and-key fitting
Substrate binding
A student claims enzymes speed reactions by supplying energy. What is the correct explanation?
They store energy for the products
They lower the activation energy needed
They provide heat to the solution
They raise the energy of reactants
If activation energy is lowered, what most likely happens to reaction rate?
It increases under the same conditions
It decreases significantly
It stops after initial binding
It stays exactly the same
Which scenario best illustrates the lock-and-key model?
Enzyme melts to fit multiple substrates
Substrates attach anywhere on the protein
Any molecule can bind any enzyme surface
Only a specific substrate binds the active site
Which statement distinguishes endothermic from exothermic reactions?
Endothermic release more energy than absorbed
Endothermic absorb more energy than released
Exothermic cannot be catalyzed by enzymes
Exothermic require higher activation energy
Which input is required for photosynthesis besides carbon dioxide and water?
Heat from mitochondria
Light energy from sunlight
Nitrogen gas from air
ATP energy from glucose
Which process releases energy for cellular work?
Cellular respiration in mitochondria
Fermentation in chloroplasts
Photosynthesis in chloroplasts
Transpiration in stomata
Which outputs are produced by photosynthesis?
Glucose and oxygen
ATP and water
Carbon dioxide and heat
Nitrogen and proteins
Which process produces water as a byproduct?
Photolysis only
Photosynthesis in leaves
Cellular respiration
Nitrogen fixation
Which term describes organisms that make their own food?
Consumer organisms
Producer organisms
Detritivore animals
Parasite organisms
What do plants take in for photosynthesis?
Carbon dioxide and water
Proteins and minerals
Oxygen and ATP
Glucose and nitrogen
Which term best matches “must consume others for energy”?
Phototroph organisms
Chemotroph organisms
Heterotroph organisms
Autotroph organisms
Which statement about energy roles is correct?
Photosynthesis releases energy as heat
Respiration stores light energy
Photosynthesis stores chemical energy
Respiration creates glucose molecules
In an energy pyramid, which trophic level has the least available energy?
Primary consumers next
Primary producers at base
Secondary consumers above
Top predators at apex
Why are top predators few in number compared to lower levels?
Energy increases at higher levels
Energy is lost between levels
Energy cycles without loss
Energy is stored only by predators
Which pair correctly matches process inputs with outputs?
Photosynthesis: O2 to CO2
Respiration: CO2 to glucose
Respiration: glucose to ATP
Photosynthesis: glucose to ATP
Which definition matches trophic level?
Role of decomposers
Rate of energy transfer
Total mass of ecosystems
Feeding level in food webs
Which term describes the total mass of organisms in a given area?
Trophic mass level
Biomass of a community
Producer capacity index
Energy density value
If frogs are removed from a pond food web, what is a likely immediate effect?
No change in energy transfer
Increase in snake populations
Decrease in insect populations
Increase in algae biomass
Introducing a new producer species most directly affects which factor first?
Biomass at the base
Predator birth rates
Oxygen demand in fish
ATP in consumers
Which statement compares photosynthesis and respiration accurately?
Photosynthesis and respiration make oxygen
Both release energy as heat
Both convert ATP to glucose
Photosynthesis stores, respiration releases
Which molecule is a direct energy currency produced by respiration?
ATP molecules
Glucose sugar
Oxygen gas
Carbon dioxide
What role do producers play in energy flow?
Release ATP directly to predators
Consume other organisms
Recycle nitrogen into glucose
Convert light into chemical energy
Which input is NOT required for cellular respiration?
Glucose molecules
Light energy
Enzymes in cells
Oxygen gas
Which misconception is corrected by energy pyramids?
Energy is infinite in ecosystems
Energy is equal across all levels
Energy decreases up the pyramid
Energy is gained at higher levels
In an energy pyramid, if Level 2 has 500,000 kcal, how much energy entered at producers?
5,000 kcal
50,000 kcal
5,000,000 kcal
500,000 kcal
Which term best describes using senses or measurement tools to gather data?
Theory
Observation
Inference
Bias
A student notes clouds darken, then predicts rain soon. What is the prediction based on?
Logical inference
Scientific law
Direct observation
Personal bias
Which statement defines bias in scientific work?
Logical interpretation
Evidence-based explanation
Consistent natural pattern
Personal preference influence
Which option best describes a scientific theory?
Well-supported explanation
Single observation report
Personal opinion statement
Rule proven without exceptions
What does a scientific law primarily describe?
Why a process happens
Consistent observed pattern
Temporary research idea
Personal belief system
Level 3 of an energy pyramid receives 50,000 kcal. Estimate energy at Level 1 producers assuming ~10% transfer per level.
50,000 kcal
5,000 kcal
500,000 kcal
5,000,000 kcal
A lab result conflicts with previous findings. What should scientists do first?
Ignore the new data
Repeat and verify tests
Change all theories immediately
Publish without review
Why do theories not “become” laws?
Laws require less evidence
They serve different purposes
Theories are always wrong
Laws explain causes deeply
Which water property enables hydrogen bonding between molecules?
Complete neutrality
Nonpolarity of water
High ionic strength
Polarity of molecules
