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>
Answer: Estuaries are often protected from severe ocean conditions but depend on the currents created by tributary streams, long shore currents, and tidal fluctuations to cycle nutrients and provide a transportation mechanism for organisms such as shellfish, eels, and turtles during some stages of their life cycles. brainliest?
Explanation:
Bubbles formed in the magma when it was still in liquid form :)
The mRNA is then pulled through the ribosome; as its codons encounter the ribosome's active site, the mRNA nucleotide sequence is translated into an amino acid sequence using the tRNAs as adaptors to add each amino acid in the correct sequence to the end of the growing polypeptide chain.
Hope this helps you bro!:)
1: c
2: d
3: b
4:a
Ik this Bc I did this last week hope this helps