1.No 2.yes 3.yes 4.no 5.no
The correct answer is letter A. Enzymes assure that digestion occurs within hours instead of days. These chemicals release fast acting agents that digest food and turn it into usable energy within the body. Without these enzymes digestion would occur at a very slow pace and the body will become weak because of the lack of nutrient absorption.
In the case of castrated or neutered male<span> rats, the medial preoptic area </span>has as much dopamine as normal rats, but the presence of a receptive female does not evoke much release of dopamine. Dopamine helps male sexual behavior in many species and is released just before and/or during copulation in three neural systems.
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I think the presence of a signal affect the expression of the structural enzymes in that it stops the production of the structural enzymes. Without the signals, the structural enzymes are produced. Genomic DNA contains both the structural genes that encodes products that serve as cellular structures or enzymes, and regulatory genes, which encode products that regulate the expression. In multicellular organisms allows for cellular differentiation while in single celled organisms like prokaryotes , regulation ensures that a cell's resources are not wasted making proteins that the cell does not need at that time.
One way to reduce water consumption on farms is to use drip irrigation. Drip irrigation is a way of watering the plants in the farm directly to their roots. By this less water are consumed and you are sure that the plant really received the amount of water that they need.