Biology Flashcards

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Biology Flashcards
2011-09-10 13:47:07

Biology of Humans
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  1. People with lactose intloerance produce insufficient amounts of ________________.
    The Enzyme Lactase
  2. The large Diversity of Biological molacules is possible because of the extensive presence of _____________.
  3. Hydrocarbons are organic molacules that contain only_______________.
    Carbon and Hydrogen Atoms
  4. Variations in the properties of different organic molecules are most closley associated with _______________.
    the presence ofr absence of functional groups
  5. A dehydration reaction is the process in which____________
    water molecules are formed when polymers are synthesized from monomers.
  6. Which of the following pairs of molacules share the same chemical composition but differ in molecular structure?
    glucose and fructose
  7. What is the main sugar use by cells for energy?
  8. Glucose plus fructose forms a disaccharide called
  9. Plant cell walls consist mainly of ___________
  10. The charateristic that all lipids have in common is that____________.
    non of them dissolves in water.
  11. Some fats are called "saturated" fats because ____________.
    all carbons in the carbon skeleton contain the maximum number of hydrogen atoms.
  12. The building blocks of protiens are called __________.
    Amino Acids
  13. A polypeptide is a long chain of amino acids bonded together by________________.
    peptide bonds
  14. The linear sequence of amino acids in a polypeptide is called its___________ Structure.
  15. The building blocks of amino acid molacules are called_____________.
  16. A specific stretch of DNA that programs the amino acid sequence of a polypeptide is callled a ___________.
  17. A shortage of phosphorus in the soil would make is especially difficult for a plant to manfacture_______________.
  18. Two strands of DNA double helix are held together by __________that form between pairs of nitrogenous bases.
    hydrogen bonds
  19. A nucleotide is composed of a(n) ____________.
    phosphate group,a nitrogen-containing base,and a five-carbon sugar.
  20. The Secondary Structure of a protein results from__________.
    Hydrogen Bonds
  21. Tertiary Structure is NOT directly dependant on ____________.
    peptide bonds
  22. Which one of the following represents the correct sequence of information flow in a cell?
    DNA to RNA to Protein
  23. If a strand of DNA has the nitrogen base sequence ATTTGC, what will be the sequence of the matching strand.
  24. If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases,how many guananine bases does it contain?
  25. Defensive protiens are manufatured by the _____________ system.
  26. What type of bond joins the monomers in a protiens primary structure?
  27. A functional cholesterol that does not harm is its role ___________.
    as a compnent of animal cell membranes.
  28. which of these is a source of lactose?
  29. Which of these is a polysaccharide?
  30. _____________ is the most abundant organic compound on earth.
  31. Is RNA a lipid?
  32. How many hydrogen atoms can conect to a carbon atom?
    up to 4 covalent bonds.
  33. In the space filling model of a molecule, the shape of each atomis depicted as a ___________.
  34. Glycogen is __________.
    a polysaccharide found in animals.
  35. glucose+glucose-> _________by ______.
    maltose+water = dehydration synthesis
  36. What is cellulose?
    A carbohydrate- it consists of carbon,oxygen, and hydrogen.
  37. An important characteristic of the double-stranded DNa molacule is that __________.
    Hydrogen bonding between base pairs is responsible for formation of a double helix.
  38. One difference between DNA and RNA is that ___________.
    DNA uses the bases CGAT whereas RNA uses the bases CGAU
  39. As a result of experimentation on lactose-intolerant individuals, scientists foun that____________.
    a small change in DNA nuucleotide sequence can have a major effect on the production of the lactase.
  40. As a reseult of studying lactose intolerance in people from different geographic regions, scientist were able to determine that____________.
    Natural selection could favor anyone with a mutation for a permanentlly active lactasae gene.
  41. 1 meter = ______ Centimeters
  42. __________ are surface appendages that allow a bacterium to stick to a surface.
  43. What is the function of a bacterium's capsule?
  44. The DNA containing region of a bacterial cell is the____________.
    Nucleated Region
  45. Where is a bactierial cell's DNA found?
    nucleoid region
  46. in a bacterium, where are protiens syntheesized?
  47. What name is given to the rigis sturcture, found outside the plasma membrande, that surrounds and suports the bacterial cell?
    Cell Wall
  48. The _____ is the bacterial structure that acts as a selective barrier, alloing nutrients to enter the cell and wastes to leave the cell.
    Plasma Membrane
  49. What kind of cells have cell walls and organelles?
    Plant Cells
  50. True of False: the large centtral vacuole, chloropasts and cell wall are found in animal cells?