<span>A. Correct – silent <em>mutations change</em> the <em>genetic</em> code of the DNA, but do not result in <em>changes</em> to the protein function. Therefore, the phenotype of the organism is not affected. A <em>mutation occurs at the midpoint of a gene</em>, <em>altering all amino acids encoded after the point of mutation</em>.
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Answer:
A, C, D are true, B is false
Explanation:
Prokaryotic cells are surrounded by a plasma membrane, but they have no internal membrane-bound organelles within their cytoplasm. They have a cell wall and cytoplasm containing ribosomes
Scientists have found that extracellular matrix component may induce specific gene expression in the embryonic tissues such as the liver and testes. For this to happen, there must be a direct communication between the extracellular matrix and the developing cells. The Integrins of transmembrane protein would most likely be involved in this kind of induction.
Integrins are the main principal receptors used by the cells of animal to bind to the matrix of extracellular. They are heterodimers and they function as transmembrane linkers between the actin cytoskeleton and the extracellular matrix. A cell can regulate the sticky activity of its integrins from within.
Learn more about integrins here
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The first organisms to appear in an area undergoing succession are known as the pioneer species. These organisms lead to a more biodiverse steady-state ecosystem.
