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:
- Modern camels are more related to Camelops than to Aepycamelus.
- Pliauchenia and Oxydactylus may share similar feautres.
- Procamelus and Stenomylous may share similar features.
Explanation:
The chart given explains how the camels are evolved between Eocene (33 myo) and Pleistocene.
- According to the chart, modern-day camels (Camelus) are a closer phylogenetic relative of Camelops because they are clustered together in the Pleistocene age section. However, Aepycamelus is last recorded in the Upper Miocene and later became extinct (or no record is found in Pliocene and Pleistocene).
- Pliauchenia and Oxydactylus have a single ancestor "Protylopus" which can be seen in the Eocene age. Although Protylopus were branched to two species in upper Miocene, it is not difficult to believe that they share many genetic similarities (features) in both lineages.
- Similarly, Procamelus and Stenomylous are the descendants of Poebrotherium and got apart at the end of the Oligocene, therefore, they will also share several features similar to each other.
An atom consists of an atomic nucleus composed of positively charged protons and neutral or uncharged neutrons.
Answer:
1. Legislative Branch (Congress)
2. Executive Branch
3.Judicial Branch
4. Trade
5. Bicameral
Explanation:
a. RNA molecules is the correct answer.
Hope this helps~
