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More Biology Questions

Discussion in 'DAT Discussions' started by RozhonDDS, Jul 17, 2006.

  1. RozhonDDS

    7+ Year Member

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    Here are some Biology questions.

    1) What happens to FAD in the first step of cellular respiration?
    a) reduced
    b) oxidized
    c) nothing happens
    d) it is not used

    2) What makes the muscles in the heart striated?
    a) cell membrane
    b)sacroplasmic reticulum
    c)overlapping actin and myosin

    3) What portion of the brain hormones and respitory levels?
    a)medulla
    b)hypothalmus
    c)thalmus
    d)cerebellum
    e)cerebrum
     
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  3. wlee009

    wlee009 Member
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    Answer for #1:A because FAD+ is reduced to FADH2 first in Kreb's cycle and then oxidized in electron transport chain
    Answer for #2:I think it's c but i'm not really sure
    I don;t understand question #3.... the question looks incomplete. But hormones are produced in hypothalamus and respiration is controlled by medulla
     
  4. DMD to Be

    DMD to Be not luffin' this weather.
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    1. A
    2. C
    3. B
    90% sure of this.
     
  5. dat_student

    dat_student Junior Member
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    yes, A is the right answer.

    yes. C is the right answer

    The question is incomplete but you are right:

    Functions of the medulla oblongata:
    1) controls autonomic functions (such as breathing and heartbeat)
    2) relays nerve messages from the brain to the spinal cord
    3) Processing of inter-aural time differences for sound localization (olivary nuclei)
    4) Function control of sneeze-, cough-, swallow-, suck-reflex, blinking, and of vomiting.

    The hypothalamus links the nervous system to the endocrine system by synthesizing and secreting neurohormones, often called releasing hormones...
     
  6. keibee82

    keibee82 Blue_tooth...
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    Isn't the answer for #1, D? because first step of cellular respiration
    is pyruvate decarboxylation which doesn't involve FAD. FAD comes
    into play in the Krebs cycle, where it gains electrons and reduced.
     
  7. tuan209

    tuan209 Member
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    why is the answer to this C? skeletal and cardiac muscles both have sacomeres, but smooth muscle does not. all 3 have thick and thin filaments, therefore all have actin and myosin.
     
  8. tuan209

    tuan209 Member
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    nevermind...i got it..hehe
     
  9. SundevilDMD

    SundevilDMD Sundevil
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    The answer to the first one is definatly nothing because the first step of cellular respiration which does not involve FAD or FADH2. It doesnt exist in the cytoplasm. The kreb cycle is where FADH2 is first made and that i am 100% sure of.
     
  10. SundevilDMD

    SundevilDMD Sundevil
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    The answer to the first one is definatly nothing because the first step of cellular respiration is GLYCOLYSIS which does not involve FAD or FADH2. It doesnt exist in the cytoplasm. The kreb cycle is where FADH2 is first made and that i am 100% sure of.
     
  11. dat_student

    dat_student Junior Member
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    Cellular respiration doesn't start with pyruvate decarboxylation. It starts with glycolysis. FAD is reduced to FADH2 during the krebs cycle. I guess it depends on what is considered to be the 1st step (e.g. everything before oxidative phosphorylation, or all the reactions that occur outside mitochondria...).

    If glycolysis is considered to be the 1st step what makes answer choice d (it is not used) wrong??

     
  12. keibee82

    keibee82 Blue_tooth...
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    GLYCOLYSIS and Cellular respirations are two different stages for glucose catabolism. Cellular respiration is an AEROBIC process and therefore first
    stage of cellular respiration cannot be glycolysis. Those are two different
    pathways. Cellular respiration have three stages. Pyruvate decarboxylation,
    Krebs cycle and electron transport chain. FAD comes into play in Krebs
    cycle.
     

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