AP BIO 11

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cuz213022
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117127
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AP BIO 11
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2011-11-15 19:57:55
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AP BIO 11
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AP BIO 11
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  1. All of the following are part of the phosphorylation cascade model except:
    A. a cellular response is initiated
    B. GTP donates a phosphate group to an active protein kinase
    C. a specific protein is activated via phosphorylation
    D. protein kinase is activated
    E. a signal molecule binds to a membrane receptor protein
    B. GTP donates a phosphate group to an active protein kinase
    (this multiple choice question has been scrambled)
  2. The steroid hormone testosterone functions inside a cell by
    A. acting as a signal receptor that activates ion-channel proteins
    B. becoming a second messenger that inhibits adenylyl cyclase
    C. binding with a receptor protein that enters the nucleus and activates specific genes
    D. coordinating a phosphorylation cascade that increases glycogen metabolism
    E. acting as a steroid signal receptor that activates ion-channel proteins
    C. binding with a receptor protein that enters the nucleus and activates specific genes
    (this multiple choice question has been scrambled)
  3. The response of a particular cell to a specific chemical signal depends on its particular collection of
    A. receptor proteins
    B. receptor proteins and relay proteins
    C. relay proteins
    D. receptor proteins, relay proteins, and proteins needed to carry out the response
    E. proteins needed to carry out the response
    D. receptor proteins, relay proteins, and proteins needed to carry out the response
    (this multiple choice question has been scrambled)
  4. All of the following are true of cell communication systems except:
    A. most signal receptors are bound to the outer membrane of the nuclear envelope
    B. cell signaling was an early event in the evolution of life
    C. in response to a signal, the cell may alter activites by changes in cytosol activity or in transcription of RNA
    D. protein phosphorylation is a major mechanism of signal transduction
    E. communicating cells may be far apart or close together
    A. most signal receptors are bound to the outer membrane of the nuclear envelope
    (this multiple choice question has been scrambled)
  5. Which of the following are widely used second messengers in signal-transduction pathways?
    A. calcium ions, cyclic AMP, and steroid hormones
    B. steriod hormones
    C. calcium ions and cyclic AMP
    D. calcium ions
    E. cyclic AMP
    C. calcium ions and cyclic AMP
    (this multiple choice question has been scrambled)
  6. The process of transduction usually begins:
    A. when the chemical signal is released from the alpha cell
    B. when the signal molecule changes the receptor protein in some way
    C. after the target cell divides
    D. after the third stage of cell signaling is completed
    E. when the hormone is released from the gland into the blood
    B. when the signal molecule changes the receptor protein in some way
    (this multiple choice question has been scrambled)
  7. Chemical signal pathways
    A. are absent in bacteria, but are plentiful in yeast
    B. operate in animals, but not in plants
    C. use hydrophilic molecules to activate enzymes
    D. involve the release of hormones into the blood
    E. usually involve signal molecules binding to a target cell surface protein
    E. usually involve signal molecules binding to a target cell surface protein
    (this multiple choice question has been scrambled)
  8. Most signal molecules:
    A. Bind to specific sites on receptor proteins in a membrane.
    B. Are able to pass through the plasma membrane by active transport.
    C. Bind to specific sites on receptor proteins in a membrane and are water soluble.
    D. Are water soluble.
    E. All of the above.
    C. Bind to specific sites on receptor proteins in a membrane and are water soluble.
    (this multiple choice question has been scrambled)
  9. From the perspective of the cell receiving the message, the three stages of cell signaling are:
    A. signal reception, signal transduction, and cellular response.
    B. The alpha, beta, and gamma stages.
    C. The paracrine, local, and synaptic stages.
    D. Signal reception, nucleus disintegration, and new cell generation.
    E. Signal reception, cellular response, and cell division.
    A. signal reception, signal transduction, and cellular response.
    (this multiple choice question has been scrambled)
  10. Which of the following is true of synaptic signaling and hormone signaling?
    A. Both are forms of paracrine signaling.
    B. Both use neurotransmitters, but hormone signaling is for adjacent cells in animals only.
    C. Hormone signaling is important between cells that are at greater distances apart than in synaptic signaling.
    D. Hormone signaling occurs in animals only.
    C. Hormone signaling is important between cells that are at greater distances apart than in synaptic signaling.
    (this multiple choice question has been scrambled)

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