significance in commercial products such as cheese and yogurt
sewage disposal
nitrogen fixation
Answer: All the four
Bacteria are single celled simple prokaryotic organisms. They perform different roles in nature:
1. decomposition: It is a process in which the complex organic matter from dead remains of plants and animals is converted into simple molecules. Many bacterial agents participate in this process, in order to obtain their nourishment. Decomposition is a natural waste management process.
2.significance in commercial products such as cheese and yogurt: Bacterial strain named as Lactobacillus is used in dairy products like cheese and yogurt. Bacteria are used to make organic acids in pickles and vinegar. Sourdough bread is made by the fermentation process of the yeast and bacteria is also used as an ingredient.
3.sewage disposal: The decomposing nature of the bacteria facilitates the degradation of organic waste present in the sewage. Therefore, they help in sewage waste management or disposal.
4. nitrogen fixation: Some bacteria lives in symbiotic relationship with plants, especially with leguminous plants. The bacteria trap the atmospheric nitrogen from the environment and supply it to plants, which is necessary for growth, in return the bacteria receives nutrition from plants.
Therefore, all the four options are correct.
b. Breaking the bonds in a disaccharide
c. Breaking a single carbon bond
d. Creating bonds to make a simple sugar
Answer: B - Breaking the bonds in a disaccharide
Explination: Just took the test.
B) heavy metals such as mercury.
C) nitrogen oxides from automotive exhaust.
D) small particles of smoke and dust in smog.
The correct answer is B) Heavy metals such as mercury.
Explanation:
Heavy metals such as mercury or lead are denser than regular metals, this causes it is common for these metals to be found in the surface of Earth rather than in the air or atmosphere. Indeed, mercury and other similar metals are extracted from the Earth's crust and then used for different purposes. As a result of this, mercury ends up in the surface of Earth or in water sources which causes soil or water pollution. This means mercury is not a common source of air pollution; on the opposite other such as CFCs, nitrogen oxides and smog remain in the air and therefore are sources of air pollution.
2. maintaining a stable internal environment
3. controlling what enters and exits the cell
4. movement of materials into the cell
The answer is (2) maintaining a stable internal environment.
Homeostasis is the process by which an organism tries to stabilise the internal body metabolism in response to external disturbances or changes. Example, when a person goes out into the snow, his body process will get overwhelmed by the sudden drop in the temperature. The body will try to stabilise its internal temperature by producing more heat in response to the cold exterior.
Answer:
B. maintaining a stable internal environment
Explanation:
B. density
C. growth factor
D. reclamation
Correct answer: A). Carrying capacity
The carrying capacity of an environment is the maximum population size of the species an environment can be able to sustain indefinitely, There would be no lack of food, water, habitat and other necessities in the environment.
It is necessary that the environment supports the given species with the natural resource limits, it should degrade the natural, social and the cultural environment. No population can live beyond the environment's carrying capacity.
In the lytic cycle, a virus that has invaded and entered a cell takes over the cell's replication mechanism. The virus makes viral DNA and viral proteins.
The virus then lyses (breaks open) the cell membrane, allowing the newly produced viruses to leave the now disintergrated host cell to infect other new cells.
In a lysogenic cycle, the viral DNA or RNA enters the cell and integrates into the host DNA as a new set of genes called prophage. The prophage is passive and non virulent and does not destroy the cell. However if the prophage undergoes any stress or mutation or is exposed to UV radiation, it may adopt the lytic cycle and become infective.