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embryonic state?

Discussion in 'DAT Discussions' started by Dencology, Nov 30, 2008.

  1. Dencology

    2+ Year Member

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    Guys i thought to post these q's here. it is a good review. they have a high chance to coming on your DAT: check them out and post your correct ans here:

    1. at what embryonic stage does embryo implant into the uterus?

    zygot
    16cell
    fertilized egg

    2. what is the difference b/w animal cell and bacteria cell?


    3. which of the following exhibit a situation where molecules are traveling acros their concentration gradient?


    a. active transport
    b. diffusion
    c. faciliated diffusion

    4. IF a disease exhibits autosomal recessive characteristics, which of the following situations will NOT occur? (explain your answer for this question)

    a. 2 homozygous dominant parents have a boy inherits the disease
    b. 2 heterozygote parents have a boys who inherits the disease.
     
    #1 Dencology, Nov 30, 2008
    Last edited: Nov 30, 2008
  2. Dentista08

    Dentista08 looking for a practice!
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    blastula (16-cell)
     
  3. chessxwizard

    7+ Year Member

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    2. Animal cell has histones, has a nucleus, has no plasmids, doesn't have a cell wall, has 80s ribosomes, etc... Bacteria has naked DNA floating around in a nucleoid, has plasmids that have genes for antibiotic resistance and fertility, has a cell wall, has 70s ribosomes... any reasonable science textbook should give you the full list of differences.

    3. You mean down their concentration gradient? Both diffusion and facilitated diffusion have molecules go down their concentration gradient, with the latter describing the use of a protein channel to get across the phospholipid bilayer. Active transport occurs with molecules going up their concentration gradient and involves energy expenditure, usually in the form of ATP hydrolysis.

    4. d = recessive disease allele. Since it exhibits autosomal recessive, sex does not matter and the progeny must have dd genotype to show the diseased phenotype. The only way to do this is if both parents are carriers of the allele. Thus, a child from 2 homozygous dominant parents cannot have recessive allele (DD x DD = only DD)
     

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