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Twelfth Grade (Grade 12) Biology Questions

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Grade 12 Human Reproduction
What system plays a vital role in the existence of the human species?
  1. cardiovascular system
  2. respiratory system
  3. digestive system
  4. reproductive system
Grade 12 Cell Structure and Function
What type of cell does not have membrane-bound organelles?
  1. plant
  2. eukaryotic
  3. somatic
  4. prokaryotic
Grade 12 Cell Structure and Function
This organelle has no ribosomes function and has lipid synthesis.
  1. Endoplasmic Reticulum
  2. Rough Endoplasmic Reticulum
  3. Smooth Endoplasmic Reticulum
  4. None of the above
Grade 12 Macromolecules
Are enzymes reusable?
  1. yes
  2. no
  3. sometimes
Grade 12 Food Chains and Webs
Heterotrophs are known as                .
  1. antagonists
  2. inhibitors
  3. consumers
  4. nucleic acids
Grade 12 Evolution
What is phylogeny?
  1. history of evolution of organisms (tree diagram)
  2. order of taxa
  3. two-part key used to identify organisms by their physical features
  4. the science of classifying and naming organisms
Grade 12 Macromolecules
What property makes phospholipids the ideal organic molecule to make up the cell membrane?
  1. Phospholipids dissolve easily in water, so materials can pass through them without the need for energy.
  2. Phospholipids contain many mitochondria, so the cell membrane has all the energy it needs to undergo mitosis.
  3. Phospholipids maintain their shape all the time, so organisms made from these cells can grow very large.
  4. Phospholipids have hydrophobic and hydrophilic ends, so cells can live in an aqueous environment and still carry out all their functions.
Grade 12 Biochemical Pathways
Energy is released from ATP when                             .
  1. a phosphate group is added
  2. amino acids bond to proteins
  3. a phosphate group is removed
  4. it is heated by the Sun
Grade 12 Macromolecules
Enzymes and some hormones are examples of
  1. proteins.
  2. carbohydrates.
  3. lipids.
  4. nucleic acids.
Grade 12 Circulatory and Immune Systems
Grade 12 Cell Structure and Function
Grade 12 DNA, RNA, and Genetics
Which base is present in DNA but not RNA?
  1. cytosine
  2. uracil
  3. guanine
  4. thymine
  5. adenine
Grade 12 Macromolecules
The function of lipids is
  1. building cell membranes.
  2. long-term energy storage.
  3. insulation.
  4. all of the above
Grade 12 Macromolecules
How are enzymes denatured?
  1. water
  2. pH
  3. temperature
  4. temperature and pH
Grade 12 DNA, RNA, and Genetics
Grade 12 DNA, RNA, and Genetics
Grade 12 Cell Structure and Function
Grade 12 Biochemical Pathways
Photosynthesis occurs in the chloroplasts of
  1. ants.
  2. plants.
  3. grasshoppers.
  4. chickens.
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