Answer:
Gated ion-channels
Explanation:
These ion channels are protein molecules that act as a passageway which span across the cell membrane allowing the movement of ions from one side of the membrane to the other. They possess the ability to open and close in response to either chemical or mechanical signals.They possess a fluidic pore, which becomes available to ions after a conformational change in the protein structure has been activated causing the ion channel to open. Based on the stimulus to which they respond, ion channels are divided into three groups: voltage-gated, ligand-gated and mechano-sensitive ion channels. Channels responding to electrical (voltage-dependent ion channels), mechanical, or chemical (ligand-gated ion channels) stimuli open and allow rapid ion movement into or out of the cell, and this movement creates an electrical signals.
Answer:
D. The skin
Explanation:
The skin is usually considered as supply-independent for oxygen delivery. The most affected organs and tissues considered as being supply-dependent for oxygen delivery are heart, brain and lungs. These are the most sensitive to oxygen deprivation, being the brain more than the other organs.
They are found in the chromosomes
As far as I remember, alcohol is considered as a depressant because it tends to suppress central nervous system activity. Depressant is a drug which reduces CNS activity because of ethanol.
Answer:
yellow; epistasis.
Explanation:
Epistasis may be defined as the phenomena in which the physical constitution of the individual gets influenced by the presence or the absence of the different genes.
The different types of epistasis are dominant epistasis, recessive epistasis and duplicate epistasis. The dog has yellow fur as it shows the case of recessive epistasis in which the recessive gene modifies the expression of black fur pigmented gene.
Thus, the correct answer is option (b).
