Pure culture can be prepared from a mixture of cultures by using the streak plate method. This enables the bacterial cells to be diluted to obtain a pure culture after many-folds dilution.
Pure culture is the one in which only one species, strain or clone of bacteria are grown. The pure culture enables to scientists to study in detail about its anatomy, lifestyle and potential uses or harms, without the interference of any other microbe.
Streak-plate method is the most commonly used technique in microbiology labs to isolate a single type of bacteria. It is performed by creating the smears of bacteria in zig-zag motion to dilute its concentration.
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Our genes can be affected by the environment and change the way our traits are displayed, called the phenotype. However, changes in phenotype have an underlying genotypic source. Epigenetics or epigenetic changes are changes in the way traits are expressed as an effect of the environment (i.e. food we ate, chemicals in the body, environmental stresses), without changes in the DNA. Simply put, in epigenetics, some parts of the DNA are turned on or off in response to environmental conditions.
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Explanation:
Phototropism- a response to <u>light stimulus</u> that directs the stem to grow toward the light and roots to grow away from it.
ii. Gravitropism- Stems and leaves grow away from the force of <u>gravity</u> while roots grow toward it.
iii.Thigmotropism - growth in response to <u>touch stimulus.</u> The side of the stem in contact with the object grows slower than the side not in contact. This causes the vine to twist around the object.
