Biology — Semester A
Free Practice · 10 Questions · 180 min
180:00 Exit
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Question 1 of 10
TEKS 4A-5D Medium Word Diagram
The diagram shows a cell in different solutions. In which solution will the cell shrink? Hypotonic Cell swells A Isotonic No change B Hypertonic Cell shrinks C
A C (Hypertonic)
B All solutions cause shrinking
C B (Isotonic)
D A (Hypotonic)
Explanation
📌 Hypertonic = more solute outside the cell
Water flows OUT of the cell by osmosis → cell shrinks (crenation)
Hypotonic → cell swells. Isotonic → no change.
Question 2 of 10
TEKS 1A-3F Easy Word Diagram
Which graph correctly shows exponential growth? A B
A B
B Both
C A
D Neither
Explanation
📌 Exponential growth = J-shaped curve (slow start, rapid increase)
Linear growth = straight line (constant rate)
Graph A shows exponential growth.
Question 3 of 10
TEKS 1A-3F Easy Word
In a controlled experiment, what is the independent variable?
A The control group
B The variable that is deliberately changed
C The variable that stays constant
D The variable that is measured
Explanation
📌 The independent variable is what the scientist deliberately changes/manipulates.
The dependent variable is what is measured as a result.
Question 4 of 10
TEKS 7A-7F Easy Word
Which scientist is credited with the theory of natural selection?
A Charles Darwin
B Gregor Mendel
C James Watson
D Louis Pasteur
Explanation
📌 Charles Darwin developed the theory of natural selection after studying finches in the Galápagos Islands.
Question 5 of 10
TEKS 4A-5D Easy Word
What is the function of the cell membrane?
A Controls what enters and exits the cell
B Produces energy
C Makes proteins
D Stores genetic information
Explanation
📌 The cell membrane is selectively permeable — it controls what enters and exits the cell.
It is made of a phospholipid bilayer.
Question 6 of 10
TEKS 4A-5D Easy Word Diagram
Which organelle is labeled X in the cell diagram below? Nucleus X ER Golgi
A Endoplasmic reticulum
B Nucleus
C Mitochondria
D Golgi apparatus
Explanation
📌 Organelle X has the bean-shaped structure with inner folds (cristae) → Mitochondria
Mitochondria = powerhouse of the cell = produces ATP through cellular respiration
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
Question 7 of 10
TEKS 8A-8C Easy Word
The correct order of taxonomic classification from broadest to most specific is:
A Domain, Phylum, Kingdom, Class, Family, Order, Genus, Species
B Kingdom, Phylum, Class, Order, Family, Genus, Species
C Species, Genus, Family, Order, Class, Phylum, Kingdom, Domain
D Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
Explanation
📌 Domain → Kingdom → Phylum → Class → Order → Family → Genus → Species
Memory: Dear King Philip Came Over For Good Spaghetti
Question 8 of 10
TEKS 1A-3F Easy Word
Which of the following is the BEST example of a hypothesis?
A If plants receive more sunlight, then they will grow taller
B Plants need water
C Photosynthesis is important
D All plants are green
Explanation
📌 A hypothesis is a testable, specific prediction.
'If plants receive more sunlight, then they will grow taller' is testable and specific.
Question 9 of 10
TEKS 4A-5D Medium Word Diagram
The Venn diagram compares photosynthesis and cellular respiration. Which belongs in the overlapping section? Photosynthesis • Uses CO₂ + H₂O • Produces glucose • In chloroplasts • Needs light Respiration • Uses glucose + O₂ • Produces CO₂ • In mitochondria • No light needed ? Both
A Occurs in the nucleus
B Uses sunlight
C Occurs only in animals
D Involves ATP and gas exchange
Explanation
📌 Both photosynthesis and cellular respiration:
• Involve ATP
• Occur in all living organisms (plants do both!)
• Use electron transport chains
• Involve gas exchange
Question 10 of 10
TEKS 8A-8C Easy Word
The scientific name for humans is Homo sapiens. 'Homo' represents the:
A kingdom
B genus
C species
D family
Explanation
📌 In binomial nomenclature: first word = Genus (capitalized), second = species (lowercase). Both italicized.

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