Biology 1 Midterm Exam Review A

25 Questions | Total Attempts: 164

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Biology 1 Midterm Exam Review A

Questions and Answers
  • 1. 
    Scientists use observations and data to form and test ___.
    • A. 

      Constants

    • B. 

      Hypotheses

    • C. 

      Theories

    • D. 

      Conclusions

  • 2. 
    What gives water many properties that are important to living things?
    • A. 

      Temperature

    • B. 

      Hydrogen bonds

    • C. 

      Density

    • D. 

      Specific heat

  • 3. 
    The four main types of carbon-based molecules in organisms are carbohydrates, lipids, nucleic acids, and ___.
    • A. 

      Starches

    • B. 

      Fatty acids

    • C. 

      Proteins

    • D. 

      Monosaccharides

  • 4. 
    If an organic molecule model contains carbon atoms arranged in a long chain, it is probably a model of ___.
    • A. 

      Starch

    • B. 

      A lipid

    • C. 

      Polar molecules

    • D. 

      Protein

  • 5. 
    Many factors should remain unchanged during an experiment. These factors are referred to as  ___.
    • A. 

      Levels

    • B. 

      Hypotheses

    • C. 

      Controlled variables

    • D. 

      Independent variables

  • 6. 
    DNA and RNA are two types of ___.
    • A. 

      Proteins

    • B. 

      Carbohydrates

    • C. 

      Lipids

    • D. 

      Nucleic acids

  • 7. 
    The smallest basic unit of matter is the ___.
    • A. 

      Atom

    • B. 

      Cell

    • C. 

      Compound

    • D. 

      Molecule

  • 8. 
    Which of the following is formed when an atom gains or loses electrons?
    • A. 

      Element

    • B. 

      Compound

    • C. 

      Molecule

    • D. 

      Ion

  • 9. 
    Atoms in molecules share pairs of electrons when they make ___.
    • A. 

      Ionic bond

    • B. 

      Covalent bond

    • C. 

      Hydrogen bond

    • D. 

      Polymers

  • 10. 
    Substances are changed into different substances when bonds break and reform during ___.
    • A. 

      Chemical equilibrium.

    • B. 

      Chemical reactions.

    • C. 

      Ion formation.

    • D. 

      Hydrogen bonding.

  • 11. 
    Fats, oils, and cholesterol are all types of ___.
    • A. 

      Hormones.

    • B. 

      Lipids.

    • C. 

      Cell membranes.

    • D. 

      Fatty acids.

  • 12. 
    Protein polymers are made of a series of ___.
    • A. 

      Amino acids

    • B. 

      Monosaccharides

    • C. 

      Histones

    • D. 

      DNA strands

  • 13. 
    The activation energy needed for a chemical reaction is decreased by a ___.
    • A. 

      Catalyst

    • B. 

      Reactant

    • C. 

      Substrate

    • D. 

      Product

  • 14. 
    Which aspect of a chemical reaction is affected by enzymes?
    • A. 

      Direction

    • B. 

      Rate

    • C. 

      Equilibrium

    • D. 

      PH

  • 15. 
    What pH would be considered a strong base?
    • A. 

      2

    • B. 

      6

    • C. 

      8

    • D. 

      12

  • 16. 
    Which of the following molecules found in the food we eat is most commonly broken down to make ATP (providing us with the most readily available energy)?
    • A. 

      Carbohydrates

    • B. 

      Lipids

    • C. 

      Proteins

    • D. 

      Vitamins

  • 17. 
    Which of the following is a major principle upon which cell theory is based?
    • A. 

      All cells form by free-cell formation.

    • B. 

      All cells have DNA.

    • C. 

      All organisms are made of cells.

    • D. 

      All cells are eukaryotic.

  • 18. 
    Identify the type of cell shown in Figure 3.1.
    • A. 

      Bacterial

    • B. 

      Animal

    • C. 

      Prokaryotic

    • D. 

      Eukaryotic

  • 19. 
    Which organelle is the storehouse for a cell's genetic information?
    • A. 

      Mitochondrion

    • B. 

      Chloroplast

    • C. 

      Centriole

    • D. 

      Nucleus

  • 20. 
    In the lock-and-key model of enzyme function shown in Figure 2.2, what is happening in step 2? 
    • A. 

      The catalyzed reaction is releasing a product.

    • B. 

      The active sites are restructuring the enzyme.

    • C. 

      The enzyme is causing new bonds to form between the substrates.

    • D. 

      The substrates are beginning to separate from each other.

  • 21. 
    What properties of carbon explain its ability to form different large and complex structures?
    • A. 

      Carbon can bond to the atoms of many other elements as well as to other carbon atoms.

    • B. 

      Carbon cannot bond easily to other carbon atoms but can bond easily to many other elements.

    • C. 

      Carbon can bond easily to other carbon atoms but cannot bond easily to many other elements.

    • D. 

      None of the above.

  • 22. 
     A researcher discovers a small molecule in muscle tissue that is rich in nitrogen, soluble in water, and lacks phosphorus. The molecule also contains carbon, hydrogen, and oxygen, in uneven ratios. The molecule must be a(n) _____.
    • A. 

      Amino acid

    • B. 

      Fatty acid

    • C. 

      Nucleic acid

    • D. 

      Monosaccharide

  • 23. 
    Which organic molecule is most important in satisfying the energy needs of animals? 
    • A. 

      Lipids, because they are easily digested and converted to glucose.

    • B. 

      Carbohydrates, because their bonds are easily broken to release ATP.

    • C. 

      Nucleic acids, because they are high in energy.

    • D. 

      Proteins, because they are made up of amino acids which are converted to ADP.

  • 24. 
     When comparing proteins, fats, and carbohydrates, the _____. 
    • A. 

      Proteins possess the most calories per gram.

    • B. 

      Fats possess the most calories per gram.

    • C. 

      Carbohydrates possess the most calories per gram.

    • D. 

      Three macromolecules have the same number of calories per gram.

  • 25. 
    Which of the following can affect the rate of biochemical reactions? 
    • A. 

      Use of a catalyst

    • B. 

      Increasing the temperature

    • C. 

      Changing the pH

    • D. 

      All of the above

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