Muscular and circulatory
Answer:
b
Explanation:
in the muscles.
Answer:
The functional unit of a muscle cell is known as a "sarcomere" which covers the distance between the two Z-lines.
The sarcomere consists of A-zone which contains both thick and thin filaments, H-zone which contains only thick filaments and I band which contains only thin filaments.
During muscle contraction, thick and thin myofibrils slide over each other due to which the distance between two z-line get reduced.The H and I zone gets shortened but A zone does not shorten but come close to other A- bands and disappears.
A freshwater and salt-water biome refers to the body of water (aquatic biome) that makes up about 75 percent of the surface of planet Earth.
The freshwater biome is divided into three (3) major levels or zones and these include:
1. Littoral zone: it is the shore area of a freshwater and it can either be very wide or very narrow.
Some examples of organisms found in the littoral zone are:
2. Limnetic zone: it is the open water area of a freshwater.
Some examples of organisms found in the limnetic zone are:
3. Profundal zone: it is the bottom and deep water area of a freshwater.
Some examples of organisms found in the profundal zone are:
On the other hand, a salt-water biome is divided into four (4) major levels or zones and these include:
1. Intertidal zone: it comprises these organisms;
2. Pelagic zone: it comprises these organisms;
3. Abyssal zone: it comprises these organisms;
4. Benthic zone: it comprises these organisms;
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a prokaryotic cell that can make its own food
an aerobic bacterium
an anaerobic bacterium
Endosymbiotic theory or symbiogenesis is the evolutionary theory. A eukaryotic cell that can make its food will arise from a cyanobacterium. Thus, option a is correct.
Endosymbiotic theory is the evolutionary theory of the origin of the eukaryotic organism from a prokaryote cell. It was formulated based on the mitochondrial DNA and the chloroplast organelle in the plant.
According to the symbiogenesis theory chloroplast and mitochondria were once free-living that got phagocytized by another cell. So, if a cyanobacterium is engulfed then the eukaryotic cell will have the power to produce its own food.
Therefore, the eukaryotic autotroph will be produced from the cyanobacterium.
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Answer:
A
Explanation: a eukaryotic cell that can make its own food
b. activation of protein kinase molecules.
c. activation of G protein-coupled receptors.
d. regulation of transcription by signaling molecules.
Protein phosphorylation is not involved in activation of G protein coupled receptor.
Further Explanation:
Roles of Protein phosphorylation are :
G- protein coupled receptor is activated through the external signals in the forms of ligand.
In this, ligand binds to the active site and cause conformation changes in receptor and active G- protein.
Protein phosphorylation is a key process in many biological functions but it is not directly involved in the activation of G protein-coupled receptors. Those receptors are activated by the binding to a specific signaling molecule, not phosphorylation.
Protein phosphorylation is a biochemical process that adds a phosphate group to a protein molecule, significantly affecting its function. Indeed, protein phosphorylation is involved in the activation of receptor tyrosine kinases, the activation of protein kinase molecules, and regulation of transcription by signaling molecules. However, phosphorylation is not directly involved in the activation of G protein-coupled receptors. Instead, these receptors are activated by binding to a specific signaling molecule or ligand, leading to a cascade of signaling events within the cell.
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