Answer:
The membrane potential of a nerve cell will depolarize if there is an increase in the positive ions inside the cell.
Explanation:
When nerves are in resting potential it is -70mV. In this stage interior of the cell is negatively charged and outside is more positive. When depolarization occurs the inside cell becomes positive.
This is due to the rush of sodium ions into the cell by voltage-gated channels. Now the inside charge is more positive and the chloride ions move out of the cell. Thus outside becomes more negative.
After some time of depolarization stage, potassium ions move out of the cell making the nerve cell again negative. Now the depolarized stage becomes repolarized by the entry of potassium ions.
During depolarization, the potential of the cell is -55mV. When repolarization occurs, it is again -70mV. But the potassium channels are open and some of the potassium ions move out of the cell making the inside environment more negative. This is known as hyperpolarization condition.
This hyperpolarization remains for a short period where action potential can't occur. This period is called the refractory period. Again potassium ions enter into the cell. This results in the resting potential of the neuron again.
Answer:
pharynx, larynx, trachea, bronchi
Explanation:
During the inhalation through the nose or mouth the air first enters the "pharynx" which is also called as throat,
then the air moves towards the "larynx" . Is a passage between the pharynx and the trachea
Through larynx the air then moves toward the "trachea". It is passage connecting the larynx and the bronchi
and then the air inhaled reaches to the "bronchi" of lungs.
hence, the correct order is "pharynx, larynx, trachea, bronchi"
Answer:
D. The oldest rock is found in the bottom layer of a rock formation.
Explanation:
Answer:
Daughter cell have the same number of chromosomes as parent cells in mitosis, whereas in meiosis, daughter cells have only half the number of chromosomes as the parent cells.
Explanation:
Mitosis produces 2 diploid cells, whereas meiosis produces 4 haploid cells.
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Answer:
The correct answer is A a ribosome reads the codon sequence at the 5" end of mRNA.
Explanation:
Translation is a process of central dogma of molecular biology which deals with the formation of protein molecule from an mRNA molecule in the cytoplasm of eukaryotic cell and in the nucleus of prokaryotic cell.
During the initiation of translation the Ribosome along with its smaller subunit binds to the first codon(AUG) of mRNA and read that codon from the 5" end and after doing this ribosome moves to the next codon.
