Biology E1 Previous Test

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jessenliz2010
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258643
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Biology E1 Previous Test
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2014-01-28 17:12:12
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E1
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biology previous test
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  1. An -NH2 group is a _____ group.
     - carboxyl
     - hydroxyl
     - amine
     - methyl
     - carbonyl
    amine
  2. A hydrogen bond is a __________.
    attractive force between a hydrogen atom and either an oxygen or a nitrogen atom that are in other molecules or within the same molecule
  3. Which statement is not true?
     - Electrons closest to the nucleus are at the  - lowest energy level
     - No more than two electrons can occupy a single orbital
     - Electrons are unable to move out of the assigned orbital space
     - The innermost orbital holds two electrons
     - At the second energy level there are four possible orbitals with a total of eight electrons
    Electrons are unable to move out of the assigned orbital space
  4. A hydrolysis reaction results in ________.
     - formation of a macromolecule
     - bond breakage of a macromolecule
     - lipid molecule creation
     - nucleic acids being made
     - most macromolecules
    bond breakage of a macromolecule
  5. Allosteric enzymes have regions that:
     - bind with inhibitor or activator molecules
     - are associated with important energy-carrying nucleotides
     - are not affected by temperature of pH
     - have two active sites
     - have all of these
    bind with inhibitor or activator molecules
  6. Keratin is a:
     - myosin
     - microtubule
     - intermediate filament
     - microfilaments
     - all of these
    intermidiate filament
  7. Prokaryotes:
     - have nucleoid regions
     - are unicellular
     - may have cell walls
     - are either bacteria or archaens
     - are or have all of these
    - are or have all of these
  8. Which of the following is one of the two main functions of the nuclear envelope?
     - provides residence for ribosomes
     - separates the DNA from cytoplasmic machinery
     - provides total isolation of nuclear components
     - enables faster cell division
     - enables larger cell size
    separates DNA from cytoplasmic machinery
  9. Which of the following statements about exergonic reactions is FALSE?
     - the release energy
     - glucose metabolism is an example
     - their products have more energy than the reactants
     - some energy is converted to less biologically useful forms
     - bonds are broken
    their products have more energy than the reactants
  10. The components of membranes that account for most of their active functions are:
     - carbohydrates
     - sterols
     - proteins
     - fats
     - phospholipids
    proteins
  11. Toxic elements such as mercury are found in the human body because:
     - of contamination from the environment
     - trace amounts of these elements have vital biological functions
     - they are needed to kill bacteria
     - they may be ingested with food but inactivated by cells
     - in small amounts they are biologically inactive and tolerated by cells
    of contamination from the environment
  12. Four of these five structures are associated with membranes. What is the exception:
     - endoplasmic reticulum
     - granum
     - plasma membrane
     - chromosome
     - nuclear envelope
    endoplasmic reticulum
  13. The "high-energy bond" in ATP:
     - absorbs a large amount of free energy when the phosphate group is attached during hydrolysis
     - is formed when ATP is hydrolyzed to ADP and phosphate
     - is similar to the bonds in glucose molecules; that is why glucose can be used as a source of metabolic energy
     - contributes to the "energy in" part of an endergonic reaction
    contributes to the "energy in" part of an endergonic reaction
  14. Cholesterol:
     - has a rigid backbone of four carbon rings
     - is the most common steroid in animal tissue
     - is a lipid without a fatty-acid component
     - is needed to produce sexual development and maturity
     - is all of these
    Is all of these
  15. The interaction of several polypeptide chains in a hemoglobin molecule is its _______ structure.
     - primary
     - secondary
     - tertiary
     - quaternary
     - combined
    quaternary
  16. A molecule is:
     - a combination of two or more atoms
     - a mixture of atoms
     - electrically charged
     - a carrier of one or more extra neutrons
    A combination of two or more atoms
  17. The enzyme responsible for breaking down alcohol is:
     - alcohol methylase
     - alcohol polyphosphorylase
     - hydroxyl alcoholgenase
     - transmenthylogenase
     - alcohol dehyrogenase
    alcohol dehyrogenase
  18. Isotopes of atoms:
     - are electrically unbalanced
     - behave the same chemically and physically but differ biologically from other isotopes
     - are the same physically and biologically but differ from other isotopes chemically
     - have the same number of protons but a different number of neutrons
     - are produced when atoms lose electrons
    Have the same number of protons but a different number of neutrons
  19. The active site of an enzyme:
     - is where the coenzyme is located
     - is a specific bulge or protuberance on an enzyme
     - is a groove or crevice in the structure of the enzyme complementary to the substrate
     - will react with only on substrate no matter how many molecules may resemble the shape of the substrate
     - rigidly resists any alteration of its shape
    is a groove or crevice in the structure of the enzyme complementary to the substrate
  20. Members of what domain are evolutionarily closest to eukaryotes?
     - animalia
     - protista
     - fungi
     - bacteria
     - archaea
    archaea
  21. A nucleolus is:
     - an extra nucleus
     - a darkly staining area in the nucleus where ribosomes are made
     - an area where the nucleus is synthesized
     - a membrane-bound organelle
     - the area in a prokaryote where DNA is concentrated
    A darkly staining area in the nucleus where ribosomes are made
  22. The LEAST inclusive (contains fewest members) of the taxonomic categories listed here is:
     - family
     - phylum
     - class
     - order
     - genus
    genus
  23. Glycogen is a polysaccharide used for energy storage by:
     - animals
     - plants
     - protistans
     - bacteria
     - archaea
    animals
  24. "Acidic" is an appropriate description for all EXCEPT which of the following: 
     - excess hydrogen ions
     - the contents of the stomach
     - magnesium hydroxide
     - HCI
     - a pH less than 7
    magnesium hydroxide
  25. The plasma membrane performs all functions except:
     - regulating the flow of materials into and out of the cell
     - providing a diffusion barrier
     - synthesizing proteins
     - facilitating communication with other cells
     - isolating the cell's contents from the environment
    synthesizing proteins
  26. The most likely reason that glucose dissolves in water is that it is:
     - an ionic compound
     - a polysaccharide
     - polar and forms many hydrogen bonds with water molecules 
     - a very unstable molecule
     - highly nonpolar
    polar and forms many hydrogen bonds with water molecules
  27. Disaccharides include:
     - sucrose
     - glucose
     - fructose
     - lactose
     - both sucrose and lactose
    both sucrose and lactose
  28. The column of water extending in tubes from plant roots to leaves is maintained by:
     - cohesion among water molecules
     - ionic bonds
     - covalent bonds
     - hydrophobic interactions
     - hydrophilic interactions
    cohesion among water molecules
  29. Four of the five answers listed below are types of intercellular connections. What is the exception?
     - tight junctions
     - gap junctions
     - plasmodesmata
     - adhering junctions
     - plasma membrane
    plasma membrane
  30. Where in cells are proteins manufactured?
     - Golgi bodies
     - vesicles
     - rough endoplasmic reticulum
     - lysosome
     - smooth endoplasmic reticulum
    rough endoplasmic reticulum
  31. Which of the following does not belong?
     - phospholipids
     - polysaccharides
     - unsaturated fats
     - steroids
     - saturated fats
    polysaccharides
  32. Which of the following is NOT true of enzyme behavior?
     - enzyme shape may change during catalysis
     - the active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts
     - all enzymes have an active site where substrates are temporarily bound
     - each enzyme can catalyze only a specific reaction
     - enzyme activity is not affected by pH and temperature
    enzyme activity is not affected by pH and temperature
  33. Which of the following is NOT a function of cell membrane proteins?
     - to move hydrophilic substances across the plasma membrane
     - to communicate with other cells
     - to isolate the inside of the cell from the outside
     - to identify cell type
     - to link cells together
    to communicate with other cells
  34. All of the following are factors in enzyme-catalyzed reactions that work alone or in combination to lower the activation energy EXCEPT:
     - helping substrates get together
     - orienting substrates in positions favoring reaction
     - breaking the laws of thermodynamics
     - shutting out water molecules
     - inducing a fit between enzyme and substrate
    breaking the laws of thermodynamics
  35. According to the first law of thermodynamics:
     - the energy of a system may increase if there is a corresponding decrease in energy elsewhere in the universe.
     - the amount of energy in the universe is constant
     - chemical reactions do not create of destroy energy
     - energy can change from one form to another
     - all of these are true
    all of these are true
  36. Which is the smallest unit of life that can exist as a separate entity?
     - a cell
     - a molecule
     - an organ
     - a population
     - an ecosystem
    a cell
  37. In oxidation-reduction reactions, all of the following are true EXCEPT:
     - one molecule gives up electrons
     - one molecule gains electrons
     - cells release energy
     - the molecule that accepts electrons is oxidized
     - hydrogen ions are usually released
    the molecule that accepts electrons is oxidized
  38. DNA codes for the production of:
     - proteins
     - minerals
     - inorganic molecules
     - vital gasses
     - water
    inorganic molecules
  39. A solution with a pH of 9 has how many times fewer hydrogen ions than a solution with a pH of 6?
     - 2
     - 4
     - 10
     - 100
     - 1000
    1000
  40. The activation energy of a reaction refers to the minimum amount of energy:
     - released by the reaction
     - in the reactants
     - in the products
     - necessary to cause a reaction to proceed on its own
     - difference between the energy of the reactants and the energy of the products
    necessary to cause a reaction to proceed on its own
  41. Cilia and flagella are most similar in:
     - length
     - the kinds of cells that have them
     - the number that cells usually have
     - their internal composition and structure
     - their location along the cell's periphery
    their internal composition and structure
  42. The more acidic of two solutions has:
     - more hydroxyl ions
     - more hydronium ions
     - more hydrogen acceptors
     - more H+ ions per liter
     - a higher pH
    more H+ ions per liter
  43. The solvent, cohesive, and temperature stabilization properties of water are due to its:
     - ability to promote hydrophilic interactions
     - ionic bonds
     - hydrogen bonds
     - ability to promote hydrophobic interactions
     - nonpolar nature
    hydrogen bonds
  44. Nucleotides contain what kind of sugars?
     - three-carbon
     - four-carbon
     - five-carbon
     - six-carbon
     - seven-carbon
    five-carbon
  45. Hydrogenation is a chemical process that turns:
     - liquid oil to solid fats
     - turns amino acids into proteins
     - turns DNA into lipids
     - creates stable alternative energy sources
     - does none of these
    liquid oil to solid fats
  46. Which of the following affects the rate of diffusion through a selectively permeable membrane?
     - concentration gradient
     - temperature
     - molecular size
     - concentration and temperature
     - temperature and molecular size
     - concentration gradient, temperature, and molecular size
    concentration gradient, temperature, and molecular size
  47. In the chemical shorthand 14C, the 14 represents the number of:
     - excess neutrons
     - protons plus neutrons
     - electrons
     - protons plus electrons
     - radioactive particles
    protons plus neutrons
  48. One generalization of the cell theory is that:
     - all cells have a nucleus
     - all cells have cell walls
     - the cell is the smallest unit that displays the properties of life
     - cells can arise from nonliving matter
     - all cells are microscopic
    the cell is the smallest unit that displays the properties of life
  49. Which of the following is thought to be the descendant of engulfed ancient bacteria?
     - nuclei
     - Golgi bodies
     - ER
     - mitochondria
     - lysosomes
    mitochondria
  50. A peptide bond forms between which two functional groups?
     - hydroxyl and amino
     - hydroxyl and carboxyl
     - hydroxyl and methyl
     - carboxyl and amino
    carboxyl and amino

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