Quiz: Important Biology Questions For Students!

37 Questions | Total Attempts: 214

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Quiz: Important Biology Questions For Students!

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Questions and Answers
  • 1. 
    From the perspective of a cell receiving messages, the three stages of cell signaling are:
    • A. 

      Paracrine, local, synaptic

    • B. 

      Reception, transduction, and cell response

    • C. 

      Reception, cell response, cell division

    • D. 

      Alpha, beta, and gamma stages

  • 2. 
    The signal transduction pathway in animals that use epinephrine:
    • A. 

      Involves activation of glycogen breakdown in liver cells

    • B. 

      Is a classic example of paracrine signaling

    • C. 

      Is a classic example of synaptic signaling

    • D. 

      Operates independently of receptors on the cell surface

    • E. 

      None of these decribes the epinephrine system

  • 3. 
    The process of signal transduction usually begins:
    • A. 

      After the target cell divides

    • B. 

      When the hormone is released into the blood

    • C. 

      When the signal molecule changes the receptor protien in some way

    • D. 

      After the third stage of cell signaling is completed

    • E. 

      None of these show the start of signal transduction

  • 4. 
    Sutherland discovered that epinephrine:
    • A. 

      Binds to calcium ions

    • B. 

      Lowers blood glucose by binding to cells

    • C. 

      Interacts with insulin inside muscle cells

    • D. 

      Does not interact directly with glycogen phosphorylase

  • 5. 
    Most signal molecules: , , and .
    • A. 

      Never enter the ctyosol of the cell

    • B. 

      Are water soluable

    • C. 

      Can't pass through the plasma membrane

    • D. 

      None of these are correct

    • E. 

      All of the above apply to most signal molecules

  • 6. 
    Ligand bound tryosine kinase signal receptors:
    • A. 

      Activate the kinase domain after they form dimers

    • B. 

      Activate the kinase domain before they form dimers

    • C. 

      Activate the G-protien that stimulates second messenger production

    • D. 

      Are not capable of hydrolyzing ATP

  • 7. 
    If an animal lacked adenylyl cyclase, it:
    • A. 

      Would not be able to transmit nerve inpulse via a synapse

    • B. 

      Could not convert GTP to ATP

    • C. 

      Would lack membrane bound receptors

    • D. 

      Would not respond properly to epinephrine signals

  • 8. 
    Which of the following is NOT considered a second messenger?
    • A. 

      CAMP

    • B. 

      Adenylyl cyclase

    • C. 

      Calcium ions

    • D. 

      Inositol triphosphate

  • 9. 
    Which one of the following is NOT part of the phosphorylation cascade model?
    • A. 

      A signal molecule binds to a membrane receptor protien

    • B. 

      Protien Kinase is activated

    • C. 

      ATP donates a phosphate group to an inactive protien kinase

    • D. 

      A specific protien is activated via phosphorylation

    • E. 

      All the above are part of the phosphorylation cascade

  • 10. 
    One of these statements about cell communication is incorrect. Which is it?
    • A. 

      Cell signaling was an early event in the evolution of life.

    • B. 

      Communicating cells may be close together or far apart.

    • C. 

      Most receptor molecules are bound to the outer membrane of the nuclear envelope.

    • D. 

      Protien phosphorylation is a major mechanism of signal transduction.

  • 11. 
    One of the major differences in cell division between prokaryotic and eukaryotic cells is that in prokaryotes:
    • A. 

      Cytokinesis does not occur

    • B. 

      Genes are not duplicated

    • C. 

      No spindle forms

    • D. 

      DNA replication does not occur

  • 12. 
    In eukaryotic organisms, chromosomes are duplicated________ cell division
    • A. 

      Before

    • B. 

      During

    • C. 

      After

    • D. 

      It depends on the specific organism

  • 13. 
    Which of the following organelles contain DNA and replicate primarily under their own direction?
    • A. 

      Centromeres

    • B. 

      Mitochondria

    • C. 

      Ribosomes

    • D. 

      Golgi

  • 14. 
    A centromere would be found:
    • A. 

      In the cytoplasm

    • B. 

      In the nucleous

    • C. 

      On a Chromatid

    • D. 

      In a ribosome

  • 15. 
    DNA is synthesized during the ______ phase of the cell cycle.
    • A. 

      G1

    • B. 

      S

    • C. 

      G2

    • D. 

      M

  • 16. 
    During both prophase AND metaphase of mitosis, sister chromatids:
    • A. 

      Have one-half the amount of DNA as does the original G1 Chromosome

    • B. 

      Move together toward one pole of the cell

    • C. 

      Are connected at a region called the centromere

    • D. 

      Are coiled or uncondensed

  • 17. 
    In mitosis, when do the centromeres split?
    • A. 

      Prophase

    • B. 

      Metaphase

    • C. 

      Anaphase

    • D. 

      Telophase

  • 18. 
    Depolymerization or breakdown of ____ happens as chromatids move toward the cell poles.
    • A. 

      Centrioles

    • B. 

      Kinetochore fibers

    • C. 

      Actin fibers

    • D. 

      Nucleoli

  • 19. 
    Density dependant contact inhibition is:
    • A. 

      When a cell stops metabolizing when it contacts another one in a cell culture.

    • B. 

      When a cell stops dividing when it contacts others in a cell culture

    • C. 

      When a girl slaps a boy because he touched her

    • D. 

      None of hte above describes contact inhibition

  • 20. 
    What is the haploid number of chromosomes in a beetle that has 34 chromosomes in its sperm cells?
    • A. 

      17

    • B. 

      34

    • C. 

      68

    • D. 

      Can't tell- need more information

  • 21. 
    When does the 2n-->n reduction occur in meosis?
    • A. 

      Metaphase I

    • B. 

      Anaphase I

    • C. 

      Metaphase II

    • D. 

      Anaphase II

  • 22. 
    Genetic recombination involves:
    • A. 

      Crossing over between nonsister chromatids

    • B. 

      Random fertilization of gametes

    • C. 

      Independant assortment of chromasomes

    • D. 

      All of the above are involved

  • 23. 
    Homologous chromosomes:
    • A. 

      Have identical genes

    • B. 

      Have genes for the same traits at the same loci

    • C. 

      Pair up in prophase II

    • D. 

      Are found in all haploid cells

  • 24. 
    When do centromeres split during meiosis?
    • A. 

      Anaphase I

    • B. 

      Anaphase II

    • C. 

      Metaphase I

    • D. 

      Metaphase II

  • 25. 
    A major difference between mitosis and meiosis is:
    • A. 

      Mitosis occurs only in the gonads

    • B. 

      Crossing over happens only in mitosis

    • C. 

      Duplicated chromosomes synapse with homologues in meiosis

    • D. 

      The nuclear membrane does not fragment in meiosis