Answer:
Reverse mutations in the colonies enabled to recover the ability to synthesize histidine. The 2-aminoanthracene is a chemical agent that induce mutations and therefore it is potentially a carcinogen.
Explanation:
A reverse (suppressing) mutation is a type of mutation capable of restoring the activity of previously mutated genes. On the other hand, 2-aminoanthracene is an aromatic amine carcinogen capable of inducing hepatic and skin tumors. In this case, 2-aminoanthracene has been used to induce reverse mutations at <em>loci</em> responsible for the synthesis of histidine.
Answer:
An immunized person can show false positive results during the test.
Explanation:
BCG (bacille Calmette-Guerin) is the vaccine which is given for tuberculosis. This vaccine is used in many countries in which the chances of spreading Tb is high in children which causes meningitis and miliary disease in children.
In United States, BCG is not recommended because the risk here is very low and the vaccinated person can show false-positive results for the disease which will result in hindering the work of epidemiologists who are tracking how and from where disease spread.
Answer:
Denitrifcation
Explanation:
<em>Thiobacillus dentrificans</em> is the gram-negative bacteria that is considered the chemoautotrophic according to its mode of nutrition.
The <em>Thiobacillus</em> is now used by the bioremediation scientists in the remediation of the wasteland as its ability to convert the reduces nitrogen forms that are nitrates and nitrites back to its dinitrogen state which escapes back into the atmosphere thus completing the nitrogen cycle.
This process of conversion is known as the denitrification and on the basis of this, the bacteria are named dentrificans.
Thus, denitrification is the correct answer.
Yes indeed that the picture shows that the transport of the sodium and potassium ions. The picture shows a passive transport of sodium and potassium ions. And also we can see that the energy for the action of the pump is being released by the utilization of the ATP. Some are being moved and some are being brought back in.
