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Some Biology ?s

Discussion in 'Pre-Dental' started by Beagle, Aug 8, 2002.

  1. Beagle

    Beagle Meet BEAGLE
    7+ Year Member

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    these are questions from the online Kaplan free test, but I do not have answers...any help is appreciated!

    1. Which of the following illustrates the principle of induction in invertebrates
    A. in an embryo, the presenve of a notochord beneath the ectoderm results in the formation of a neural tube
    B. A neuron synapses with antoher neuron via a neurotransmitter
    C. Eye muscles contrstict in responce to light
    D. The maternal parent induces spontaneous expression of recessive genes

    I thought the answer was A, but then if you look carefully, the question is asking about INVERTEBRATEs????


    2. If two individuals with geneotypes AaBbCc mate, what is the probability that they will produce offspring with geneotype AABBCC?
    A. 1/64
    B. 1/32
    C. 1/16
    D. 1/4
    E. 1/2
    How do you even do this problem?

    3. Muscle movement on the cellular level is initated by the release of CA from the terminal cisternae. Terminal cisternae are associated with
    a. sarcoplasmic reticulum
    B. myosin-cross bridges
    C. myoglobin
    D. caniliculi
    E. Thin filaments

    Anyone know the answer? Is this ? too picky?


    4. Inbreeding within a population is likely to lead to:
    A. an increased number of mutations
    B. an increased expression of recessive traits
    C. An increased expression of dominant traits
    ???? They all sound good to me!

    5. According to the first law of thermodynamics
    A. energy transfer leads to less organization
    B. A system that is isolated from any energy source increase in entropy
    C. Evolution is possibly through the absorption of energy
    D. Energy is balanced by living organisms
    E. Total energy in an isolated system remains constant

    Is the answer E???


    6. According to the second law of thermodynamics
    1. matter cannot be destroyed or created
    2. conservation of heat to work leads to less organization
    3. entropy is unchanged or increases following a thermodynamic process
    A. 1 only
    B. 2 only
    C. 1 and 3
    D. 2 and 3
    E. 1,2, and 3


    Thanks so much!!!
     
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  3. nycdoc

    nycdoc Senior Member
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    For #2, if I remember correctly, do a punnet square for each trait.
    Aa X Aa = 1 AA, 2 Aa, 1aa. So the chance of getting an AA is 1/4.
    This is the same for each of the other crosses:Bb XBb=1/4 BB
    Cc X Cc=1/4 CC. Now multiply the 3: 1/4 X 1/4 X 1/4 and you get 1/64
     
  4. DesiDentist

    DesiDentist G. S. Khurana, DMD, MBA
    Moderator Emeritus Exhibitor 10+ Year Member

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    It's early. If I made any mistakes please correct me.

    DesiDentist
     
  5. ItsGavinC

    Dentist Moderator Emeritus 15+ Year Member

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    I agree with Desi's answers:
    1 - A
    2 - E
    3 - A
    4 - B
    5 - E
    6 - B

    But be forewarned, the answer key for that online test is incorrect. Also, you can miss only 4 questions on the online Bio section and you'll still get an 18 overall. The database for grading/scoring the online kap test is loaded with problems.

    Use this exam to get your brain thinking, but don't gauge your performance by it.
     
  6. johnkimx1

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    number 1 is A
    under chordates there are amphioxus (lancelets and tunicates) who are invertebrates

    good luck
     
  7. samurai361

    2+ Year Member

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    uh no Gavin and Desi are wrong on #2, it's definitely done the way nycdoc described.

    (probability of AA * probability of BB * probability of CC)

    Do a punnet square for each individual probability, ie for A:
    AA Aa
    Aa aa

    So (1/4) * (1/4) * (1/4) = 1/64

    I am 100% certain.
     
  8. khangreen

    2+ Year Member

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    Regarding 4, A would not be right since the possibility of a mutation is always constant. Inbreeding means they have the same recessive genes and have higher chance to produce a homozygous recessive individual than if it were random mating withing a larger population.
     

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