Biology — Semester B
Free Practice · 7 Questions · 180 min
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Question 1 of 7
TEKS 9A-9D Medium Word Diagram
Match each biomolecule to its function based on the diagram. Carbs Quick energy Lipids Long-term energy Proteins Build & repair Nucleic Acids Genetic info Which biomolecule stores genetic information?
A Lipids
B Carbohydrates
C Nucleic acids
D Proteins
Explanation
📌 The four biomolecules and their primary functions:
• Carbohydrates → quick energy (glucose, starch)
• Lipids → long-term energy, cell membranes
• Proteins → building, repair, enzymes
• Nucleic acids → store genetic info (DNA, RNA)
Question 2 of 7
TEKS 10A-10C Easy Image
The image shows the human respiratory system. Which structure is the primary site of gas exchange?
A Trachea
B Alveoli
C Bronchi
D Larynx
Explanation
Gas exchange (O₂ ↔ CO₂) happens at the alveoli, where their thin walls allow gases to diffuse between air and capillary blood.
Question 3 of 7
TEKS 9A-9D Easy Diagram

Which biomolecule serves primarily as long-term energy storage?

fatty acid(long carbon chain)Gglucose(quick energy)
A Carbohydrates
B Proteins
C Lipids (fats / oils)
D Nucleic acids
Explanation
Lipids store about twice the energy per gram as carbohydrates → ideal for long-term energy storage. Carbs are quick-access energy.
Question 4 of 7
TEKS 10A-10C Easy Diagram

The diagram shows the heart's four chambers. Which chamber pumps oxygenated blood to the body?

RightatriumLeftatriumRightventricle→ to lungsLeftventricle→ to bodydeoxygenatedsideoxygenatedsideHEART (anterior view)
A Left atrium
B Left ventricle
C Right atrium
D Right ventricle
Explanation
The left ventricle pumps oxygen-rich blood out through the aorta to the body. Right ventricle sends deoxygenated blood to the lungs.
Question 5 of 7
TEKS 11A-12F Easy Word Image
In the food web below, what would happen if all the frogs were removed?
A Snake population increases
B Nothing changes
C All organisms die
D Insect population increases and snake population decreases
Explanation
📌 If frogs are removed:
• Insects (grasshoppers) they ate would INCREASE (no predator)
• Snakes that ate frogs would DECREASE (less food)
• This demonstrates how removing one species affects the entire food web.
Question 6 of 7
TEKS 11A-12F Easy Word Diagram
The diagram shows a carbon cycle. Which process RELEASES carbon dioxide into the atmosphere? CO₂ in Air Plants Animals Decomposers Photosynthesis (absorbs CO₂) Respiration (releases CO₂) eating decomposition
A Condensation
B Nitrogen fixation
C Photosynthesis
D Cellular respiration
Explanation
📌 Processes that RELEASE CO₂:
• Cellular respiration (animals AND plants)
• Combustion (burning fossil fuels)
• Decomposition

Process that ABSORBS CO₂:
• Photosynthesis
Question 7 of 7
TEKS 9A-9D Easy Diagram

The diagram shows the four biomolecule types. Which is built from amino acids?

Carbohydratesmonomer:monosaccharidee.g., glucoseLipidsmonomer:fatty acide.g., fats, oilsProteinsmonomer:amino acide.g., enzymesNucleic acidsmonomer:nucleotideDNA, RNA
A Carbohydrates
B Proteins
C Nucleic acids
D Lipids
Explanation
Proteins are polymers of amino acids. Carbohydrates → monosaccharides; lipids → fatty acids/glycerol; nucleic acids → nucleotides.

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