Genetics Test 2

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kingbken
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123580
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Genetics Test 2
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2011-12-14 01:57:17
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Genetics Test
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Genetics Test 2
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  1. The PSII reaction center, also known as P680, ____.
    1. absorbs light most strongly at 680nm
    2. reflects light most strongly at 680nm
    3. absorbs light most weakly at 680nm
    4. absors light most strongly at 700nm
    A. 4
    B. 3
    C. 2 and 3
    D. 2
    E. 1
    E. 1
    (this multiple choice question has been scrambled)
  2. How do Na+ ions enter a neuron when an action potential is initiated?
    A. the Na+/K+ ATPase
    B. the ligand-gated Na+ channel
    C. a gated NA+ pump
    D. a voltage-gated Na+ facilitated trasporter
    E. a voltage-gated NA+ channel
    E. a voltage-gated Na+ channel
    (this multiple choice question has been scrambled)
  3. What lines the plasmodesmata?
    A. integral membrane proteins
    B. the plasma membrane
    C. peripheral proteins
    D. DNA
    E. carbohydrates
    B. the plasma membrane
    (this multiple choice question has been scrambled)
  4. What process is responsible for organelle turnover in the cell and carries out the regulated destruction of the cell's own organelles for the purpose of recycling the components of which they are made?
    A. apoptosis
    B. autolysis
    C. autonomy
    D. autoplagy
    E. autophagolysosome
    D. autonomy
    (this multiple choice question has been scrambled)
  5. What is the reason that C3 plants must open their stomata even when the climate is hot and dry?
    a. to take in CO
    b. to take in CO2
    c. to take in water
    d. to let CO2 out of the leaf
    e. to take in O2
    b. to take in CO2
  6. With what structure is the RER often seen to be continuous, as seen by its association with ribosomes?
    A. the golgi complex
    B. the outer mitochondrial membrane
    C. the outer chloroplast membrane
    D. the inner membrane of the nuclear envelope
    E. the outer membrane of the nuclear envelope
    E. the outer membrane of the nuclear envelope
    (this multiple choice question has been scrambled)
  7. What integral membrane protein family made of two membrane-spanning chains (α and β) is involed in attaching cells to their extracellular microenvironment?
    A. laminins
    B. fibronectins
    C. integrins
    D. myosins
    E. lysins
    C. integrins
    (this multiple choice question has been scrambled)
  8. Which property appears to be most important in allowing cells to spread from a primary tumor into the rest of the body?
    A. increased adhesion
    B. fecundity
    C. increased autophagy
    D. decreased adhesion
    E. increased apoptosis
    D. decreased adhesion
    (this multiple choice question has been scrambled)
  9. Lysosomal enzymes are transported from the trans golgi complex in vesicles coated with wht protein?
    A. clathrin
    B. COPII
    C. acid phosphatase
    D. lysozyme
    E. dynamin
    A. clathrin
    (this multiple choice question has been scrambled)
  10. What is caused by the inability of NA+ ion channels to open for several milliseconds after their inactivation?
    A. a refractory period
    B. an action potential
    C. hyperpolarization
    D. depolarization
    E. termination
    A. a refractory period
    (this multiple choice question has been scrambled)
  11. What determines the direction of the Rubisco-catalyzed reaction?
    A. the concentration of O2 alone
    B. cofactors for Rubisco
    C. the concentration of CO2 alone
    D. rubisco itself
    E. the CO2/O2 ratio available to the enzyme
    E. the CO2/O2 ratio available to the enzyme
    (this multiple choice question has been scrambled)
  12. What is the distinguishing characteristic of a P-type pump?
    A. It must be protonated during the cycle
    B. It must be deprotonated during the cycle
    C. It must be pumped during the cycle
    D. It must be phosphorylated during the cycle
    E. It must be potassiumated during the cycle
    D. It must be phosphorylated during the cycle
    (this multiple choice question has been scrambled)
  13. In general, diseases that result from a deficiency of a single lysosomal enzyme are called ___.
    A. ancestral disorders
    B. lysosomal dissociation disorder
    C. Tay-Sachs Disease
    D. lysosomal storage disorders
    E. ancestral lysosomal disorders
    D. lysosomal storage disorder
    (this multiple choice question has been scrambled)
  14. Photoautotrophs include
    a. plants
    b. eukaryotic algae
    c. various flagellated protists
    d. members of several groups of prokaryotes
    e. all of the above
    e. all of the above
  15. What explains the fact that plants lack the specialized junctions seen in animal cells?
    A. the presence of the cell wall
    B. the presence of mitochondria
    C. the absence of centrioles, basal bodies, cilia, and flagella
    D. the presence of the large central vacuole
    E. the presence of chloroplasts
    A. the presence of the cell wall
    (this multiple choice question has been scrambled)
  16. How did the evolution of photosynthesis set the stage for the evolution of aerobic respiration?
    A. Photosynthesis produces a waste product (carbon dioxide) that led to the evolution of aerobic respiration.
    B. Photosynthesis inhibits glycolysis.
    C. Photosynthesis produces a waste product (sulfur) that led to the evolution of aerobic respiration.
    D. Photosynthesis uses carbon monoxide in the atmosphere.
    E. Photosynthesis produces a waste product (oxygen) that led to the evolution of aerobic respiration.
    E. Photosynthesis produces a waste product (oxygen) that let to the evolution of aerobic respiration.
    (this multiple choice question has been scrambled)
  17. How is a nerve impulse usually transmitted across a synapse from a presynaptic to a postsynaptic cell?
    A. via a neurotransmitter
    B. via Na+ ions
    C. via a direct connection
    D. via a spark
    E. via plasmodesmata
    A. via a neurotransmitter
    (this multiple choice question has been scrambled)
  18. A new type of communication system has been discovered that conists of thin, highly elongated tubules capable of conducting cell-surface proteins, cytoplasmic vesicles and calcium signals from one cell to another. This system is referred to as ___.
    A. T tubules
    B. tunneling nanotubes
    C. tunneling nanotypes
    D. sarcoplasmic tubules
    E. scanning tunneling EMs
    C. tunneling nanotypes
    (this multiple choice question has been scrambled)
  19. All collagen family members consist of ___ chains arranged in a ___.
    A. 4, double helix
    B. 3, triple helix
    C. 3, triple lattice
    D. 3, double helix
    E. 2, triple helix
    B. 3, triple helix
    (this multiple choice question has been scrambled)
  20. Which of the models below suggests that the Golgi cisternae are transient structures that form at the cis face of the stack by fusion of membranous carriers from the ER and that each cisterna travels through the Golgi complex from the cis to the trans end of the stack, changing in composition as it progresses?
    A. the vesicular transport model
    B. the secretory transport model
    C. the cisternal maturation model
    D. the cargo carrying model
    E. the chemiosmotic model
    C. the cisternal maturation model
    (this multiple choice question has been scrambled)
  21. What are the two sites within a cell at which protein synthesis is generally thought to occur?
    A. free ribosomes and cytosolic surface of SER
    B. cisternal surface of RER and free ribosomes
    C. cytosolic surface of RER and free ribosomes
    D. cytosolic surface of RER and cisternal surface of RER
    E. cytosolic surface of RER and cytosolic surface of SER
    C. cytosolic surface of RER and free ribosomes
    (this multiple choice question has been scrambled)
  22. Where are the enzyme that synthesize carbohydrates located?
    A. the lumen
    B. stroma
    C. chloroplast envelope
    D. grana
    E. thylakoids
    B. stroma
    (this multiple choice question has been scrambled)
  23. A cellular phenomenon called RNA interference is a process in which cells produce small RNAs called ___ bind to specific mRNAs and inhibit the translation of these mRNAs into proteins.
    A. RNAsi
    B. snRNAs
    C. siRNAs
    D. mRNAs
    E. isRNAs
    C. siRNAs
    (this multiple choice question has been scrambled)
  24. Which coated vesicles move materials in a retrograde direction from the golgi stack backwards towards the ER?
    A. COPII-coated vesicles
    B. COPI-coated vesicles
    C. both COPII-coated vesicles and COPI-coated vesicles
    D. cadmium-coated vesicles
    E. clathrin-coated vesicles
    B. COPI-coated vesicles
    (this multiple choice question has been scrambled)
  25. A tissue has been briefly labeled with radiolabeled amino acids. It is then transferred to a medium containing unlabeled amino acids. This can be done several times with different tissues samples for carying periods of time.
    A. pulse
    B. labelard
    C. pulse-chase
    D. chase
    E. statin
    C. pulse-chase
    (this multiple choice question has been scrambled)
  26. In chloroplasts, a proton gradient is established with a higher concentration of protons found in the ___ and a lower concentration in the ___.
    A. stroma, thylakoid lumen
    B. thylakoid lumen, intermembrane space
    C. intermemrane space, thylakoid lumen
    D. thylakoid lumen, stroma
    E. intermembrane space, matrix
    D. thylakoid lumen, stroma
    (this multiple choice question has been scrambled)
  27. The initial product of carbon fixation contains __ carbons, but it breaks down into two compounds containing carbons.
    A. 10,5
    B. 6,3
    C. 8,4
    D. 6,6
    E. 12,6
    B. 6,3
    (this multiple choice question has been scrambled)
  28. _____ is a process that strengthens certain synapses by repeated neuron stimulation over a short time period
    A. temporality
    B. denaturation
    C. long term deviation
    D. long term potentiation
    E. short term memory
    D. long term potentiation
    (this multiple choice question has been scrambled)
  29. The degradation of the extracellular matrix, along with cell surface proteins, is accomplished mostly by the enzyme famiy called ____.
    A. laminase
    B. fibronectinase
    C. matrix metalloproteinases
    d. None of the above.
    C. matrix metalloproteinases
    (this multiple choice question has been scrambled)
  30. The light-driven splitting of a water molecule is known as _____.
    A. photolysis
    B. condensation
    C. dehydration
    D. hydrolysis
    E. photonization
    A. photolysis
    (this multiple choice question has been scrambled)

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