Answer:
<h2>4</h2>
Explanation:
Lobe-finned fishes are bony fish, having fleshy, lobed, paired fins, these fins are joined to the body by a single bone only . The fins of these lobe-finned fishes differ from all other fishes in many ways, Lobe-finned fish lived in water.
By the passage of time, from fin on lobe-finned fish changed to legs and feet on the early amphibians due to variations among offspring, followed by natural selection. These legs and feet containing amphibians lives both in water and land.
One challenge is that surface characteristics can be misleading. One example is that fungi typically look more like plants than animals, but are more closely related to animals than plants. In addition, it can be difficult to determine whether similar characteristics are because of similar ancestry or similar environment. In short, determining relationships based on characteristics has a lot of room for error, and often must be used in conjunction with other methods to reach a conclusion with reasonable certainty.
Answer:
Option E
Explanation:
Complete question
A researcher is using a small molecule as an inhibitor to manipulate a signaling pathway. This inhibitor prevents phosphorylation and MOST likely targets a:
A) ligand-gated ion channel.
B) G protein-coupled receptor.
C) phosphatase.
D) G protein.
E) receptor kinase.
Solution
Receptor kinase is an enzyme that acts as a catalyst while transferring phosphate group to specific substrate thereby causing auto phosphorylation of tyrosine.
Phosphorylation occurs when receptor kinase binds to the ligands. Binding causes dimerization of receptor kinase which then phosphorylates tyrosine residues in the cytosolic domain.
The inhibitor molecule prevents phosphorylation therefore it must target the molecule responsible for causing tyrosine phosphorylation.
Hence, option E is correct
The southern polar jet stream<span> mostly circles </span><span>Antarctica.</span>
The Nervous system of the body consists of all the nerve cells. It is the body's "speedy" electrochemical communication system.
every neuron (nerve cell) has a long process known as 'axon' which is used to contact the next cell in the circuit. The receiving cell (another neuron) has small processes called 'dendrites' which are contacted by the axon. Now the neurons, like all other cells in the body, are enclosed by a selectively permeable cell membrane - which means it allows certain chemicals to pass through, while others are prevented from entering or leaving the cell