Which one of these statements is true about ATP synthase ?Group of answer choicesThe beta subunits may be all in the empty conformation at the same time at some point in the catalytic cycle.Rotational catalysis refers to the rotation of the beta subunits as ATP is made.The movement of protons through the F0 subunit induces rotation of the c subunits.The gamma subunit associates with all three beta subunits at the same time.all of the above are true
Question
Which one of these statements is true about ATP synthase ?Group of answer choicesThe beta subunits may be all in the empty conformation at the same time at some point in the catalytic cycle.Rotational catalysis refers to the rotation of the beta subunits as ATP is made.The movement of protons through the F0 subunit induces rotation of the c subunits.The gamma subunit associates with all three beta subunits at the same time.all of the above are true
Solution
Para responder a esta pregunta, es importante entender el funcionamiento de la ATP sintasa y sus subunidades. Vamos a analizar cada una de las afirmaciones:
-
The beta subunits may be all in the empty conformation at the same time at some point in the catalytic cycle.
- Esta afirmación no es correcta. Las subunidades beta de la ATP sintasa no están todas en la conformación vacía al mismo tiempo. En cualquier momento dado, cada una de las tres subunidades beta está en una de las tres conformaciones diferentes: una que une ADP y fosfato inorgánico, otra que sintetiza ATP, y otra que libera ATP.
-
Rotational catalysis refers to the rotation of the beta subunits as ATP is made.
- Esta afirmación no es correcta. La catálisis rotacional se refiere a la rotación del eje central (subunidad gamma) y no de las subunidades beta. Las subunidades beta cambian de conformación en respuesta a la rotación de la subunidad gamma.
-
The movement of protons through the F0 subunit induces rotation of the c subunits.
- Esta afirmación es correcta. El movimiento de protones a través de la subunidad F0 induce la rotación del anillo de subunidades c, lo que a su vez impulsa la rotación de la subunidad gamma.
-
The gamma subunit associates with all three beta subunits at the same time.
- Esta afirmación no es correcta. La subunidad gamma interactúa con las tres subunidades beta, pero no de la misma manera al mismo tiempo. La rotación de la subunidad gamma cambia la conformación de cada subunidad beta de manera secuencial.
-
All of the above are true.
- Esta afirmación no es correcta, ya que no todas las afirmaciones anteriores son verdaderas.
Por lo tanto, la afirmación correcta es: The movement of protons through the F0 subunit induces rotation of the c subunits.
Similar Questions
Which ONE of the following is responsible for the rotation in ATP synthase needed to produce ATP?Group of answer choicesThe F1 stator.The beta subunits.The c subunits.The lipid anchor.
A decrease in the observed rate of ATP synthase rotation in mitochondria isolated from L156P cells relative to that observed in mitochondria isolated from wild-type cells would support which of the hypotheses given in the passage?A.Hypothesis 1 onlyB.Hypothesis 2 onlyC.Hypotheses 1 and 2 onlyD.Hypotheses 2 and 3 only
You discover a chemical that affects the function of ATP synthase. When exposed to this chemical, ATP synthase allows protons to travel through it to the matrix but the gamma subunit does not turn at all. What would be the effect of this chemical on a cellular level?Group of answer choicesA) more ATP will be madeB) more oxygen will be usedC) less electron transport through the electron transport chain will occurD) no change because catalysis will still occur in the beta subunitsE) A and B
Which of the following statements about bacterial motility is TRUE? Choose all the correct statements. Group of answer choicesGliding motility independent of flagella is seen in some cyanobacteriaCilia composed of microtubules are responsible for movement in many groups of bacteriaBacterial flagella rotate to propel the bacteria through a liquid medium.An ATPase releases energy from ATP to drive rotation of bacterial flagella
Within a mitochondrion, in what direction do protons move through ATP synthase?Group of answer choicesFrom both the cytosol and mitochondrial matrix into the intermembrane space.From the cytosol into the intermembrane spaceFrom the intermembrane space into the mitochondrial matrixFrom the mitochondrial matrix into the intermembrane spaceFrom the intermembrane space into the cytosol
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.