The situation that would result in a cell exhibiting positive phototaxis is A. High levels of NAD+ compared to NADH in the cytosol.

Here's why:

Phototaxis is the movement of an organism in response to light. Positive phototaxis is movement towards light, which is exhibited by the cell when its energy state is low.

NAD+ and NADH are both crucial in cellular respiration and energy production. NAD+ is the oxidized form and is capable of accepting electrons, which can then be used in ATP production. NADH is the reduced form that has accepted electrons.

A high level of NAD+ compared to NADH in the cytosol indicates that the cell has a low energy state. This is because there are more molecules available to accept electrons and participate in energy production (NAD+), and fewer molecules that have already accepted electrons (NADH).

Therefore, in this state, the cell would move towards light to increase its energy production, exhibiting positive phototaxis.

The other options (B, C, D) all indicate a high energy state of the cell, which would result in negative phototaxis, or movement away from light.

Question

The situation that would result in a cell exhibiting positive phototaxis is A. High levels of NAD+ compared to NADH in the cytosol.

Here's why:

Phototaxis is the movement of an organism in response to light. Positive phototaxis is movement towards light, which is exhibited by the cell when its energy state is low.

NAD+ and NADH are both crucial in cellular respiration and energy production. NAD+ is the oxidized form and is capable of accepting electrons, which can then be used in ATP production. NADH is the reduced form that has accepted electrons.

A high level of NAD+ compared to NADH in the cytosol indicates that the cell has a low energy state. This is because there are more molecules available to accept electrons and participate in energy production (NAD+), and fewer molecules that have already accepted electrons (NADH).

Therefore, in this state, the cell would move towards light to increase its energy production, exhibiting positive phototaxis.

The other options (B, C, D) all indicate a high energy state of the cell, which would result in negative phototaxis, or movement away from light.

Knowee AI · Accepted Answer

The situation that would result in a cell exhibiting positive phototaxis is A. High levels of NAD+ compared to NADH in the cytosol.

Here's why:

Phototaxis is the movement of an organism in response to light. Positive phototaxis is movement towards light, which is exhibited by the cell when its energy state is low.

NAD+ and NADH are both crucial in cellular respiration and energy production. NAD+ is the oxidized form and is capable of accepting electrons, which can then be used in ATP production. NADH is the reduced form that has accepted electrons.

A high level of NAD+ compared to NADH in the cytosol indicates that the cell has a low energy state. This is because there are more molecules available to accept electrons and participate in energy production (NAD+), and fewer molecules that have already accepted electrons (NADH).

Therefore, in this state, the cell would move towards light to increase its energy production, exhibiting positive phototaxis.

The other options (B, C, D) all indicate a high energy state of the cell, which would result in negative phototaxis, or movement away from light.

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