Lipids and Steroids Quiz
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Questions and Answers

What is the primary function of lipids?

  • To speed up biochemical reactions
  • To kill other bacteria
  • To form plasma membranes that enclose cells (correct)
  • To transport certain chemicals into and out of cells
  • Which group of compounds is structurally very different from lipids?

  • Proteins
  • Triglycerides
  • Steroids (correct)
  • Fatty acids
  • In a living cell, which organic compound group would tip the scale if separated and weighed?

  • Triglycerides
  • Fatty acids
  • Lipids
  • Proteins (correct)
  • Which proteins speed up biochemical reactions?

    <p>Enzymes</p> Signup and view all the answers

    What is the essential function of transporter proteins?

    <p>To transport certain chemicals into and out of cells</p> Signup and view all the answers

    Which organic compound group is important constituents of the plasma membranes of animal cells and mycoplasmas?

    <p>Steroids</p> Signup and view all the answers

    What is the main energy-supplying molecule of living cells?

    <p>Glucose</p> Signup and view all the answers

    Which type of carbohydrates consist of tens or hundreds of monosaccharides joined through dehydration synthesis?

    <p>Polysaccharides</p> Signup and view all the answers

    What is composed of glucose subunits and synthesized as a storage material by animals and some bacteria?

    <p>Glycogen</p> Signup and view all the answers

    Which compound is the main component of the cell walls of plants and most algae?

    <p>Cellulose</p> Signup and view all the answers

    Which group of organic compounds found in living matter provides the structure of membranes and some cell walls?

    <p>Lipids</p> Signup and view all the answers

    If lipids were to suddenly disappear from the Earth, what would be the consequence for living cells?

    <p>Immediate cell collapse</p> Signup and view all the answers

    What are characteristic functional groups in organic compounds?

    <p>Groups of atoms responsible for most chemical reactions</p> Signup and view all the answers

    Which organic compound includes sugars and starches?

    <p>Carbohydrates</p> Signup and view all the answers

    What is the main function of deoxyribose in living organisms?

    <p>Being a building block of DNA</p> Signup and view all the answers

    What is the principal function of carbohydrates in living systems?

    <p>Functioning as food reserves</p> Signup and view all the answers

    Which type of sugars are called monosaccharides?

    <p>Sugars with three to seven carbon atoms</p> Signup and view all the answers

    What is the role of hexoses and pentoses in living organisms?

    <p>Fueling cellular activities</p> Signup and view all the answers

    What ions do acids dissociate into in an aqueous environment?

    <p>H+ and anions</p> Signup and view all the answers

    How does the pH scale express the amount of H+ in a solution?

    <p>Linear scale from 0 to 14</p> Signup and view all the answers

    What happens to enzymes in cells when acid or base concentrations are too high or too low?

    <p>They denature and lose their function</p> Signup and view all the answers

    Which ions are free in a solution that is considered acidic?

    <p>H+</p> Signup and view all the answers

    Why is it important for organisms to maintain a balance of acids and bases?

    <p>To ensure proper enzyme function</p> Signup and view all the answers

    In terms of the pH scale, what does a change of one whole number represent?

    <p>A tenfold change in concentration</p> Signup and view all the answers

    What is the role of water in facilitating the passage of nutrients through cell membranes?

    <p>Water dissolves nutrients for easier passage</p> Signup and view all the answers

    How does water contribute to most chemical reactions inside living cells?

    <p>Water serves as a medium for reactions to occur</p> Signup and view all the answers

    What defines an acid based on its ability to donate?

    <p>Acids donate protons (H+)</p> Signup and view all the answers

    Which ions do bases dissociate into when in water?

    <p>Negatively charged hydroxide ions (OH-)</p> Signup and view all the answers

    What differentiates a salt from acids and bases?

    <p>Salts dissociate into cations and anions that are not H+ or OH-</p> Signup and view all the answers

    In the context of acid-base balance, the pH scale measures the concentration of which ions?

    <p>Hydrogen ions (H+)</p> Signup and view all the answers

    What is the primary function of pH buffers in living organisms?

    <p>To maintain a steady pH in the presence of waste products</p> Signup and view all the answers

    Which of the following is NOT a factor that can alter the pH in the environment's water and soil?

    <p>Nutrient absorption by plants</p> Signup and view all the answers

    What is the significance of adding pH buffers to a culture medium in a laboratory?

    <p>To prevent drastic pH changes that can inhibit bacterial growth</p> Signup and view all the answers

    Which of the following building blocks are carbohydrates primarily composed of?

    <p>Monosaccharides</p> Signup and view all the answers

    In the context of organic compounds, what differentiates simple lipids from complex lipids and steroids?

    <p>Simple lipids only contain carbon and hydrogen, while complex lipids and steroids contain additional elements</p> Signup and view all the answers

    What is the role of the pH scale in understanding acid-base balance?

    <p>To quantify the acidity or basicity of a solution on a numerical scale</p> Signup and view all the answers

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