Answer:
B
Explanation:
The Ames test is a bacteriological technique commonly used to determine if a particular chemical or substance can cause mutations. To achieve this, researchers use bacteria (commonly <em>Salmonella typhimurium</em>) as this bacteria strain is unable to grow in a medium that does not contain histidine (a very important amino acid in the biosynthesis of proteins). If the studied substance is able to cause mutations, bacteria will mutate, and they will be able to grow on that particular media even if they don’t have histidine for their metabolism. Therefore, if there are colonies growing, the chemical being tested is mutagenic.
I hope this clarify your inquiry.
Three human activities that may make the slopes unstable are the following:
1. Deforestation
Cutting off trees may result to loose soil since there will be lesser roots that will hold the soil together. When rain water runs off the slope, it will make the slope more unstable, resulting to mud/land slide.
2. Water excavation/extraction
This may also result to unstable slope, because the soil may sink as more water is extracted from the ground to supply the need of the growing population. In extreme cases, this may result to the formation of sinkhole.
3. Drilling of the earth
Drilling may result to unstable slope if is done in a landslide prone area as it will disturb the formation of rocks and soil.
C.) increase the concentration of one of the solutions
Answer: This bacterium can survive passage through the acidic conditions of the stomach. Inside the small intestine, V. cholerae attaches to the intestinal wall and starts producing cholera toxin. The toxin enters intestinal cells, causing them to release water and ions, including sodium and chloride ions.
Decoding instructions for making proteins
