This will result to an excitatory postsynaptic potential ((EPSP)
Neurotransmitters are those chemical messages that transmits signals from nerve cells to their target cells.
Neurotransmitters are packed inside vesicles at the presynaptic nerve terminal.
The arrival of an action potential at this terminal leads to opening of Voltage gated channels.
This leads to a change in membrane voltage of the postsynaptic cell following the influx of positively charged ions (sodium ion) into the cell which is called the excitatory postsynaptic potential.
Therefore, excitatory postsynaptic potential ((EPSP) occurs when a neurotransmitter opens a chemically gated ion channel that allowing sodium to enter the postsynaptic cell.
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Answer:
b. orientation dependent
e. located upstream of the gene it controls
Explanation:
Promoter sequences:
These are the sequences present within the DNA on which RNA polymerase binds and start transcription of a gene. These sequences are present directly upstream of transcription initiation site at the 5' end.
Prokaryotes and Eukaryotes both have specific promoter location site which is fixed. So first (a) and Last (f) options of this question are wrong.
This sequence have specific orientation Like TATA box so these are orientation dependent.
These sequences are present directly upstream of transcription initiation site at the 5' end.
I thinks it’s human and sharks of humans and whales
Answer/Explanation:
Normal cell division is a very controlled process.
There are several checkpoints where the cell ensures the cell is:
- receiving the correct signals to divide
- that the environmental conditions are favourable for the cell to divide
- that there is no damage to the DNA.
However, cancerous cells proliferate uncontrollably. This is because they can bypass the checkpoints and divide without the necessary signals. This means cell division keeps occurring even when conditions are unfavourable and the DNA is damaged.
I believe the answer is openings into the tracheae of insects
Spiracle is an opening that connect to the respiratory organ. When opened, the spiracle will allow air from atmosphere to flow to the trachea. It could be found in insect like spider or in vertebrae like jawless fish. You could say that spiracle is similar to nostril in human
