All protozoans are unicellular (are a single cell). Similar to the plant-like protists, protozoa are found in nearly all aquatic habitats. Protozoa play a key role in maintaining the balance of ecosystems. They are an important food source for organisms higher up in food chains.
How about "recombinant DNA?" Which is the result of DNA cloning as ttom suggests.
Antibiotic resistance occurs<span> when </span>bacteria change<span> in </span>a way<span> that </span>reduces<span> the </span>effectiveness<span> of </span>drugs<span>, </span>chemicals<span>, or </span>other agents designed<span> to </span>cure<span> or </span>prevent infections<span>. The </span>bacteria survive<span> and </span>continue<span> to </span>multiply<span>, </span>causing more harm to a person or host<span>.</span>
The correct answer is signal transduction.
Signal transduction also called cell signaling refers to the conduction of molecular signals from the external of the cell to its internal. The signals perceived by the cells must be conducted efficiently into the cell to make sure an effective response. This step is stimulated by cell-surface receptors.
There are three phases in the procedure of communication or cell signaling, that is, reception, transduction, and response.
Neurogenesis
As recently as two decades ago, scientists believed we were born with all the neurons we would ever have. But the discovery of neurogenesis occurring in certain brain areas in monkeys gave rise to the hope that someday scientists will be able to induce the adult human brain to heal itself.
Neurogenesis is the process by which new neurons are created and developed in the brain. The new neurons are created by neural stem cells and it happens in almost all species of animals. Neurogenesis is effectual during embryonic development and completely through adult life in different organisms.
