34)4. 36)1 is what I think the answer could be. For my studies and quizzes I could feel like those answer are it.
Answer:
Explanation:
This is known as the RNA world hypothesis. Scientists favor RNA over DNA as the first genetic molecule for several reasons. Perhaps the most important is that RNA can, in addition to carrying information, act as a catalyst. ... A catalytic RNA could, potentially, catalyze a chemical reaction to copy itself.
Planarians and tapeworms are from Platyhelminthes, which contains flatworms.
Answer:
D) integrins
Explanation:
The extracellular matrix is an intricate network of carbohydrates and proteins in the cells extracellular space. <em>Collagen proteins </em>undergo modification with carbohydrates within the cell to form collagen fibers; they are interwoven with proteoglycan complexes is made up of carbohydrates proteins and polysaccharides. The resulting mesh is capable of providing structural integrity, mechanical strength and support to tissue.
In the ECM, the fibers are joined to integrins by fibrobronectin bridges. Integrin proteins form crucial connections between surrounding cells, are embedded within the cells' plasma membranes and anchors them in the ECM. Also, they facilitate cell communication in the environment- <u>they are capable of detecting mechanical and chemical signals</u> from the ECM and respond by stimulating signal pathways inside the cell.
Much more carbon will be present in the landscape, seeing as plants which absorb it have been removed in quite large quantities. A major avenue of carbon absorption has thus been removed. In addition, immense amounts of carbon will have been released into the air from the burning itself. This carbon, combined with the otherwise existing carbon that is now stuck in the atmosphere (with no trees to absorb it), will contribute to pollution.