Few Bio Questions

[HossIX949]

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If acetylaldehyde is used as an electron acceptor instead of oxygen in eukaryote metabolism what will happen?

A. More ATP will be produced from glucose than normal
B. The same amount of ATP will be produced
C. Less ATP will be produced



As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy

A. It is used to phosphorylate NAD+ to NADPH
B. It excites electrons of the reaction center of Photosystem I
C. It is used to establish and maintain a proton gradient
D. It is lost as heat



Which of the following statements about the distribution of ions in a resting cell is true?

A. Potassium and sodium ion concentrations are higher inside the cell than outside
B. Potassium and chloride ion concentrations are higher inside the cell than outside
C. Sodium and chloride ion concentrations are higher inside the cell than outside
D. Potassium ion concentration is higher inside the cell, and the sodium ion concentration is higher outside


If a sensory stimulus induces a large change in a sensory receptors membrane potential, there will be a change in:

A. The strength of action potentials fired
B. The duration of action potentials fired
C. The frequency of action potentials fired
D. All of the above





Thanks 4 the help!

 

[iwannabadentist]

IMO,

1. C (not sure too much)
2. B (ultimately to make ATP)
3. D
4. C

anyone correct me if im wrong on any of these

 

[HossIX949]

As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy

A. It is used to phosphorylate NAD+ to NADPH
B. It excites electrons of the reaction center of Photosystem I
C. It is used to establish and maintain a proton gradient
D. It is lost as heat


Thats the answer but i too picked B. Anyone have any explanations behind it

 

[pbure9]

As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy

A. It is used to phosphorylate NAD+ to NADPH
B. It excites electrons of the reaction center of Photosystem I
C. It is used to establish and maintain a proton gradient
D. It is lost as heat


Thats the answer but i too picked B. Anyone have any explanations behind it

They lose energy because they travel down the electron transport chain and produce ATP, so I think C makes the most sense here. Plus, isn't PSI excited by light as well?

 

[Sublimation]

As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy

A. It is used to phosphorylate NAD+ to NADPH
B. It excites electrons of the reaction center of Photosystem I
C. It is used to establish and maintain a proton gradient
D. It is lost as heat


Thats the answer but i too picked B. Anyone have any explanations behind it

As in the electron transport chain in the mito. the electron will alter the conformation of the protein and therefore allow it to take a proton from the surrounding and force it against its concentration gradient. The energy that is lost is used to push protons against their gradient.

 

[ethanyoo726]

If acetylaldehyde is used as an electron acceptor instead of oxygen in eukaryote metabolism what will happen?

A. More ATP will be produced from glucose than normal
B. The same amount of ATP will be produced
C. Less ATP will be produced

Acetaldehyde is involved with fermentation.
----------
As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy

A. It is used to phosphorylate NAD+ to NADPH
B. It excites electrons of the reaction center of Photosystem I
C. It is used to establish and maintain a proton gradient
D. It is lost as heat

The question is asking about the ENERGY. The energy is used to to pump protons from the stroma into the thylakoid space, thereby establishing a proton gradient.
----------
Which of the following statements about the distribution of ions in a resting cell is true?

A. Potassium and sodium ion concentrations are higher inside the cell than outside
B. Potassium and chloride ion concentrations are higher inside the cell than outside
C. Sodium and chloride ion concentrations are higher inside the cell than outside
D. Potassium ion concentration is higher inside the cell, and the sodium ion concentration is higher outside

This is a fact that you should memorize. This is maintained by a sodium-potassium pump, which uses ATP to pump 3 Na+ out of cell for every 2 K+ into cell.
----------

If a sensory stimulus induces a large change in a sensory receptors membrane potential, there will be a change in:

A. The strength of action potentials fired
B. The duration of action potentials fired
C. The frequency of action potentials fired
D. All of the above

The action potentials follow an "All or Nothing" response, meaning that they either fire at full strength and duration or not at all. Strength and duration of action potentials do not fluctuate based on the stimulus intensity. ONLY frequency increases with stronger sensory stimuli.

 

[Sublimation]

If acetylaldehyde is used as an electron acceptor instead of oxygen in eukaryote metabolism what will happen?

A. More ATP will be produced from glucose than normal
B. The same amount of ATP will be produced
C. Less ATP will be produced

Acetaldehyde is involved with fermentation.

Very true. Too add to that, Acetylaldehyde is the intermediate that is the precursor to ethanol in alcoholic fermentation.

 

[Dentite99]

Got it.

 

[peyman2002]

As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy

A. It is used to phosphorylate NAD+ to NADPH
B. It excites electrons of the reaction center of Photosystem I
C. It is used to establish and maintain a proton gradient
D. It is lost as heat

The answer is D, I think it could be both C and D here cause the energy is used to do work (proton transfer) then lost as heat, I don't know I think the author meant "C" though,but D isn't that wrong either.