Facilitated diffusion. It is a passive transport mechanism in which carrier proteins shuttle molecules across the cell membrane without using the cell’s energy supplies. Instead, the energy is provide by the concentration gradient, which means that molecules are transported from higher to lower concentrations, into or out of the cell. The carrier proteins bind to glucose, which causes them to change shape and translocate the glucose from one side of the membrane to the other. Red blood cells use facilitated diffusion to absorb glucose.
Answer:
A possible explanation for this color change could be the acid present in the Snail slime has brought the color change.
Explanation:
- Snails are Gastropod molluscs.
- They secrete a mucus like watery slime to adhere to the surface .
- Snails also use their slime as a defense.
- Chemical analysis of snail slime suggested that it contains hyaluronic acid and glycolic acid along with other components.
- Thus we can state that snail slime is acidic in nature.
- In the given question it is stated that the blue solution turns yellow on adding a weak acid.
- So when the color of water changed from blue to yellow after 30 minutes, we can assume that the colour change was caused due to the slime secreted by Aquatic snail that was introduced into the tube.
In the viable plate count method, a measured volume of a culture is evenly spread across an agar surface and incubated. Each <u>colony </u>represents one <u>cell </u>from the original sample.
Explanation:
A viable count is the number of colony forming units (cfu) of microbes per gram or per milliliter of the sample, or cfu/gm or cfu/ml.
In order to find whether the cells counted is viable or not, methods like plate-count method, membrane-filter methods are used. These tests allow the visible cells to grow and multiply to check the viability.
The plate count method is done by growing the microorganisms like bacteria on a plate in a nutrient medium or substrate like the agar surface. The bacteria will grow into colonies and will be visible to the naked eye.
Each colony unit is counted and each unit in a colony represents a single cell of the bacteria or any microorganism cultured and counted.
The counting is done by various methods like hemocytometers, streak plate etc.
Answer:
MicF RNA is transcribed and base pairs with the OmpF mRNA at the ribosome binding site effectively preventing translation of the OmpF porin protein