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Science Questions - All Grades

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Grade 9 Biogeochemical Cycles
The recycling of chemical elements throughout an ecosystem is
  1. energy.
  2. a trophic level.
  3. the phosphorus cycle.
  4. the biogeochemical cycle.
Grade 9 Cell Structure and Function
Grade 9 Human Reproduction
When does conception, or fertilization, occur?
  1. An egg matures in a female's ovary.
  2. All 23 pairs of chromosomes are present.
  3. A dominant gene overrides a recessive gene.
  4. Sperm from a male unites with an egg from a female.
Grade 9 Macromolecules
Phospholipids are the primary component of
  1. cell membranes.
  2. cell walls.
  3. ribosomes.
  4. steroids.
Grade 9 Cell Structure and Function
What is the most basic unit of life?
  1. cell
  2. organ
  3. organelle
  4. tissue
Grade 6 Lab Practices and Tools
Grade 9 Biogeochemical Cycles
Grade 10 Macromolecules
What type of macromolecules are the enzymes found in our bodies?
  1. lipids
  2. carbohydrates
  3. proteins
  4. nucleic acids
Grade 9 Macromolecules
The substrate binds to the enzyme at the
  1. neuroreceptor.
  2. active site.
  3. reception area.
  4. receiving site.
Grade 10 Acids and Bases
Which of the following represents an acid-base neutralization reaction?
  1. [math]AgCl + Na rarr NaCl + Ag[/math]
  2. [math]CH_3COOH + CH_3CH_2OH rarr CH_3COOCH_3CH_2 + H_2O[/math]
  3. [math]2H_3PO_4 + 6LiOH rarr 2Li_3PO_4 + 6H_2O[/math]
  4. None of the above
Grade 9 Food Chains and Webs
What is the ultimate source of energy in any food chain?
  1. the sun
  2. producers
  3. consumers
  4. decomposers
Grade 10 Macromolecules
Carbohydrates are made of which 3 elements?
  1. nitrogen, oxygen, and hydrogen
  2. carbon, hydrogen, and oxygen
  3. sulfur, hydrogen, and oxygen
  4. nitrogen, phosphorus, and oxygen
Grade 10 Acids and Bases
Grade 10 Macromolecules
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