<span>The correct option from the given options is: "Scientist have determined the composition of Earth's core by using radiometric dating to examine meteorites".
</span><span>To date materials the procedure of radiometric dating or
radioactive dating is used, for example, rocks or carbon, in which trace
radioactive impurities were specifically fused when they were framed. The
strategy looks at the abundance of a normally happening radioactive isotope
inside the material to the abundance of its decay items, which shape at a known
consistent rate of decay.</span>
<h2>Gram Negative and Positive Bacteria</h2>
Explanation:
- The cell wall of <em>gram-positive bacteria is a peptidoglycan macromolecule </em>with joined adornment molecules, for example,<em> teichoic acids, teichuronic acids, polyphosphates, or sugars</em>
- <em>Gram-negative bacteria</em> organisms are not destroyed by specific cleansers which easily <em>kill Gram-positive bacteria </em>
- Surface displayed proteins on microbes play key role in <em>pathogenesis </em>as they elevate bacterial attachment to have tissues, acquisition of essential nutrients, evasion and suppression of<em> immune response and host cell entry</em>
Explanation:
- Cytochrome c is a peripheral membrane protein
- Cytochrome oxidase is an integral membrane protein
Transmembrane proteins are embedded within the membrane from the extracellular fluid to the cytoplasm, and are sometimes attached to glycoproteins (proteins attached to carbohydrates) which function as cell surface markers -they function as transport proteins, membrane enzymes and receptors, and cell adhesion molecules
.
Further Explanation:
Integral membrane proteins are embedded and fixed within the membrane and flow from the extracellular fluid to the cytoplasm, and sometimes contain hydrophobic side chains which interact with phospholipids within the membrane which helps to anchor them; they contain one or more domains which span the protein. Multipass integral proteins cross the membrane several times whereas single pass integral proteins cross only once
Perpheral or extrinsic don't have interactions with the membrane's hydrophobic core. These are bound via interactions with polar phospholipid heads or other integral proteins and may be modified by the addition of fatty acids and lipids. They primarily function in transmitting messenger signals, to form temporary associations with the cell membrane and freely move unto the extracellular or intracellular space.
These carry out facilitated diffusion is used for the transport of large molecules unable to cross the plasma membrane at will. However, passive diffusion, describes the movement of substances (small molecules and ions) across the membrane, along their concentration gradient.
<em>The schematic diagrams for each type are attached.</em>
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Learn more about membrane components at brainly.com/question/1971706
Learn more about plasma membrane transport at brainly.com/question/11410881
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Correct answer: B). They can be transformed into any type of body cell.
The stem cell is the biological cell that has the ability to differentiate into other types of cell. These are always found in the multi-cellular organism. These cells are known to be the foundation of every tissue and organ in our body. Embryonic stem cell is pluripotent, it means they can give rise to every type of cell in the body.
Example: Hematopoietic stem cells that give rise to all type of blood cells like red blood cells, white blood cells etc.
Hence, the correct answer would be option B.
Answer:
false
Explanation:
Fire extinguishers, emergency showers and eye wash stations are basic safety elements that must be present in all laboratories, regardless of their classification. This is because these are essential elements for common accidents in laboratories and can be easily solved with their presence.
