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Biochemistry and Human Health

Chemistry

Test your knowledge of the chemical elements, compounds, and reactions that sustain the human body.

biochemistry human-body health chemistry

8 Questions Medium Ages 5+ Nov 3, 2026

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About this Study Set

This study set covers Chemistry through 8 practice questions. Test your knowledge of the chemical elements, compounds, and reactions that sustain the human body. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 8 questions from the Biochemistry and Human Health study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which chemical element makes up the largest percentage of the human body by mass?

A Carbon
B Oxygen
C Hydrogen
D Nitrogen

2 Which acid is the primary chemical component of gastric juice in the human stomach?

A Sulfuric acid
B Acetic acid
C Hydrochloric acid
D Nitric acid

3 Which metal ion sits at the center of the heme molecule in hemoglobin to bind oxygen?

A Iron
B Copper
C Zinc
D Magnesium

4 Which chemical system is primarily responsible for maintaining the pH of human blood within a tight range of 7.35 to 7.45?

A Phosphate buffer system
B Bicarbonate buffer system
C Acetate buffer system
D Citrate buffer system

5 Which chemical element is essential for the thyroid gland to produce hormones that regulate metabolism?

A Iodine
B Selenium
C Potassium
D Calcium

6 Human bone matrix and tooth enamel are primarily composed of a crystalline mineral known as what?

A Calcite
B Gypsum
C Hydroxyapatite
D Fluorite

7 Which molecule serves as the principal high-energy chemical currency for standard cell processes?

A Glucose
B Adenosine triphosphate (ATP)
C Deoxyribonucleic acid (DNA)
D Cholesterol

8 Carbon monoxide is toxic to humans because it binds to hemoglobin with an affinity approximately how many times greater than oxygen?

A 2 times
B 10 times
C 200 times
D 5,000 times

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