microChemQA

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Author:
eingram
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131232
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microChemQA
Updated:
2012-01-30 13:18:33
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micro lab chemistry review
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micro lab chemistry review
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  1. What the most abundant component of almost all living cells, is essential for cellular functioning and makes up between 65% and 75% of an average cell's mass?

    water
  2. No living organism can survive without what?
    water
  3. Water is an excellent dissolving medium or ______
    solvent
  4. What is able to separate and surround many different kinds of solutes (dissolving substances)?
    water
  5. What are able to produce hydrogen ions (H+) whenthey dissociate (dissolve) in water?
    acids
  6. Most _____ produce or releasehydroxide ions (OH-) when they dissociate (dissolve) in water.
    bases
  7. What are substances which dissociate (dissolve) in water to form ions (charged particles) other than H+or OH-?
    salts
  8. What is a measure of the amount of H+ in a solution?
    pH
  9. pH value 7 is described as ____. (At this pH, the H+ concentration is equal to the OH- concentration.)
    neutral
  10. pH values below 7 (ex., 3 or 5, with more H+ present than OH-) are described as _______.
    acidic
  11. pH values above 7 (ex.,10 or 12, with less H+ present than OH-) are described as ___ or ____.
    basic or alkaline
  12. What are substances which microorganisms possess (or which may be added to the organisms' culture or growth media) that help keep the pH from changing too drastically so that microorganisms can survive.
    buffers
  13. If, as living organisms (like bacteria) grow, the pH changes too much, bacterial __________ may be inhibited,and the bacteria may ______
    enzymes, die
  14. Carbon is found in ______ molecules, which are relatively complex and are capable of complicated biological functions.
    organic
  15. Organic macromolecules such as_____ ______, ______, ______ are assembled in living cells and are important to cells' survival
    carbohydrates, lipids, proteins, nucleic acids
  16. Carbon atoms form how many covalent bonds with each other (or with other chemical elements)?
    4
  17. What are assembled in living cells and are important to cells' survival?
    nucleic acids
  18. The principle function ofcarbohydrates is to ________ by serving as a ready source of _____
    • fuel cell activities
    • energy
  19. Monosaccharides, or single-sugar carbohydrates are what very common hexose (containing 6 carbon atoms)?
    glucose
  20. What is the main energy supplying molecule for living cells?
    glucose
  21. Other biologically important monosaccharides are the pentoses, such as ____ present in the nucleic acid DNA.
    deoxyribose
  22. Cells form chemical bonds, such as those linking multiple monosaccharides together, through a type of reaction known as ___.
    dehydration synthesis
  23. A molecule of ________ is released when dehydration synthesis occurs.
    water
  24. Cells digest (break down)disaccharides and larger carbohydrates by adding _______ molecules between sugar units.
    water
  25. What is hydrolysis?
    when cells digest disaccharides and larger carbs by adding water between sugar
  26. What are essential to the structure and function of membranes which separate living cells from their environments?
    lipids
  27. Cell membranes contain two rows(a bilayer) of ______, each made of glycerol, two fatty acids, and a phosphate group.
    phospholipids
  28. What enable the cell membrane to act as a barrier separating the contents of a cell from the water-based environment around the cell?
    phosopholipids
  29. Waxes (such as those present inthe cell walls of acid fast bacteria like Mycobacterium tuberculosis) are considered to be a type of complex _____.
    lipid
  30. What are organic molecules containing carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur?
    proteins
  31. What typically make up 50% or more of a cell's dry weight (weight of the cell after water hasbeen removed from it)?
    proteins
  32. What are proteins which speed up cells' chemical reactions?
    enzymes
  33. What are the building blocks of proteins?
    amino acids
  34. How many different amino acids occur naturally in proteins?
    20
  35. One protein may contain from 50 to hundreds of ____ molecules arranged in an almost infinite number of ways. This allows cells to form a practically endless number of different proteins.
    amino acid
  36. Chemical bonds between ___ in proteins are called ___ bonds
    • amino acids
    • peptide
  37. Peptide bonds are formed by ____ reactions as water is removed between units.
    dehydration synthesis
  38. The unique, genetically-determined order (or sequence) of the amino acids in a proteingives the protein its ____ structure, while its _____ structure involves the twisting or folding of the polypeptide chain.
    • primary
    • secondary
  39. What structure gives each proteina unique three-dimensional shape?
    tertiary
  40. Some proteins also have _____ structure, with two or more individual polypeptide chains aggregating together to form the functional protein
    quaternary
  41. The overall shape of a protein may be _______ (compact and relatively spherical) or______ (long, thin, and thread-like).
    • globular
    • fibrous
  42. Extreme temperature, extreme pH, and other extreme conditions may cause protein ____, with loss of normalshape and functioning.
    denaturation
  43. DNA and RNA are both considered to be _______.
    nucleic acids
  44. Both DNA and RNA are made of building block structural units known as _____.
    nucleotides
  45. Each nucleotide is comprised of what three subunits
    • nirogen base
    • pentose sugar
    • phosphate group
  46. The four nitrogen-containingbases in DNA are: _____
    • A adenine
    • T thymine
    • G guanine
    • C cytosine
  47. The pentose sugar in DNA is ______.
    deoxyribose
  48. The four nitrogen-containingbases in RNA are:
    • A adenine
    • U uracil
    • G guanine
    • C cytosine
  49. The pentose sugar in RNA is ________.
    ribose
  50. In each _____-stranded DNA molecule, the nitrogen-containing bases on the separate strands hydrogen-bond(pair) with each other.
    double
  51. In DNA the nitrogen-containing base adenine (A) always pairs with the nitrogen-containing base____
    T thymine
  52. The nitrogen-containing base guanine (G) always pairs with the nitrogen-containing base _____.
    C cytosine
  53. What type of chemical reaction is responsible for bonding the separate nucleotides to each other during DNA replication?
    dehydration synthesis
  54. Adenosine triphosphate (abbreviated ___) is the main energy-carrying molecule used by all cells.
    ATP
  55. What stores the chemical energy released by certain chemical reactions, and it provides the energy required in order for other chemical reactions to occur?
    ATP
  56. ATP is made up of ____ and ____, with three ______ attached.
    • Adenine
    • ribose
    • phosphate groups
  57. Based on its name and structure, is ATP chemically moresimilar to carbohydrates, lipids, proteins, or nucleic acids?
    nucleic acids

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