After incubation, you observe that your streak-plate has heavy, uniform growth but no isolated colonies. Which of the following
could explain this result? To be marked correct, you'll need to select all applicable statements, as there may be more than one correct answer.A streak plate achieves isolated colonies by physically diluting the culture as it is spread over the plate.After incubation, you observe that your streak-plate has heavy, uniform growth but no isolated colonies. Which of the following could explain this result? To be marked correct, you'll need to select all applicable statements, as there may be more than one correct answer.1. The specimen was a mixed culture.2. The plate is contaminated.3. Area three of the streak plate crossed into area one of the streak plate.4. The loop was not properly sterilized between plate sections.
<em>Option 3</em>: We know that area 1 would contain heavy streaking and not single colonies. Therefore, if the loop crosses area 3 and enters area 1, it will definitely result in heavy streaking again.
<em>Option 4</em>: We always need to sterilize properly the loop when streaking in different areas. If we don't do it, it is possible that the loop contains a lot of bacteria that would be streaked again.
Options 1 and 2 are incorrect because, according to question, there is a uniform growth but no isolated colonies. So, contamination or mixed culture would not produce uniform growth streaking rather mixed with other bacterial types.
If the snake population runs out of small animals to eat such as mice or rabbits then the snakes would starve and die unless they could move to another habitat. All of the other animals in the food web would also die due to their lack of food supplies. The populations of the consumers would fall as the population of the producer fell.
