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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 Macromolecules
Are enzymes reusable?
  1. yes
  2. no
  3. sometimes
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 Circulatory and Immune Systems
Grade 12 Macromolecules
Enzymes and some hormones are examples of
  1. proteins.
  2. carbohydrates.
  3. lipids.
  4. nucleic acids.
Grade 12 Respiration, Digestion, and Excretion
What does an increase in the rate of contractions of the diaphragm and rib muscles indicate?
  1. decreased reduced hemoglobin in the blood.
  2. decreased hydrogen ion concentration.
  3. increased concentration of oxyhemoglobin in the blood.
  4. increased concentration of bicarbonate ion in the blood.
Grade 12 Respiration, Digestion, and Excretion
What is the function of the cilia found in the respiratory system function?
  1. bring air into the lungs.
  2. initiate the coughing reflex.
  3. force air out of the lungs.
  4. move mucus towards the glottis.
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
How are enzymes denatured?
  1. water
  2. pH
  3. temperature
  4. temperature and pH
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 Respiration, Digestion, and Excretion
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.
Grade 12 Macromolecules
All are properties of water except
  1. adhesion.
  2. cohesion.
  3. heat capacity.
  4. enzyme ability.
Grade 12 Biochemical Pathways
How do enzymes make reactions go faster?
  1. They lower activation energy.
  2. They raise the activation energy.
  3. They supply extra reactants.
  4. They limit the amount of products in the reaction.
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