All cells are produced from other cells is one of the principle of the cell theory.
Option B
<u>Explanation</u>:
"Cell theory" states that basic unit of life has some unique features which are categorized into three main faiths which explains that:
- First, any organism which is alive is made with one (unicellular) or more (multicellular) cells.
- Second, any living entity is made up of at least a cell which makes the cell the unit of life.
- Third, any cell that exits in nature is only because of the previous cell from which it takes birth.
Energy is released through bonds and glucose is formed
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Answer:
The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the upper part of the plant body. Xylem is a complex tissue consisting of living and non-living cells.
Answer:
The correct option is - (a) the activation and inactivation gates must both be open.
Explanation:
Option (a) is correct because of the following reason -
The axonal membrane is at its natural resting potential until an action potential occurs, and
channels are deactivated and blocked on the extracellular side by their activation gates. The activation gates open in response to an electric current, allowing positively charged
ions to flow into the neuron through the channels. When enough
has penetrated the neuron and the membrane potential has reached a certain level, the
channels inactivate themselves by closing their inactivation gates at the height of the action potential. The inactivation gate can be thought of as a "plug" tethered to the intracellular alpha subunit's domains III and IV. When the inactivation gate is closed, the flow of
through the channel is stopped. As a result, both the activation and inactivation gates must be open to enable sodium ions to enter the cell.
<u>Hence , the correct option is (a).</u>