Which phrase correctly defines a gene?
O a complete protein
a segment of DNA
a segment of a protein
a part of the cell membrane
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Ответ:
A segment of DNA
Explanation:
Genes are parts of DNA
Ответ:
Option A - clear, distinct horizons with organic matter and mineral nutrients
Explanation:
Horizons are the specific layers of soil. Usually the topsoil,then below is the subsoil down to the rocky layers beneath.
Organic matter refers to the dead and decaying materials present; it must not be in excess as the heat of its decomposition could affect the root hairs
Mineral nutrients such as phosphorus, zinc etc, are mainly MICRO NUTRIENTS (required in trace amounts) for optimal yield of crops.
Therefore, the soil most suitable for farming should have clear, distinct horizons with organic matter and mineral nutrients.