The answer is D.
Heterozygous individuals pass the dominant and recessive alleles to offspring.
Answer:
without these proteins(RNA) , the DNA would not happen
Explanation:
hope it helps
A. Settling Tank - 3. A principle tool of primary sewage treatment. Lightweight solids, grease and floating particles are skimmed off the top and heavier materials sink to the bottom as sludge.
B. Trickle Filter - 4. A secondary sewage treatment system used in smaller communities. Effluent from the primary treatment slowly flows through a shallow artificial stream. The water is oxygenated as it flows over the rocks. The rocks become covered with a zooglial mass of aerobic microorganisms that break down organic matter to CO2.
C. BOD - 2. An abbreviation that stands for Biochemical Oxygen Demand. This is a measure of the total amount of organic matter that is dissolved in a sewage sample.
D. Activated Sludge System - 5. A secondary sewage treatment system used in larger communities. Effluent from the primary treatment is seeded with sludge that contains a high concentration of metabolizing bacteria and vigorously aerated. Aerobic metabolism breaks down organic matter that is dissolved in the water to CO2. Growth of microorganisms produces more sludge, which is allowed to settle out.
E. Imhoff Tank - 6. A container for the anaerobic digestion of sludge. Anaerobic bacteria ferment organic matter producing CO2, H2 and small organic acids such as acetic acid and formic acid. Then anaerobic archaea convert the small acids, CO2 and H2 to methane.
F. Floc - 1. A particle of organic matter that sinks to the bottom of a tank. These particles particles consist of little pieces of organic matter covered with microorganisms. The microbial population of the particles is a mixed community of bacteria and fungi that degrade organic compounds and protozoa that eat the smaller microorganisms. Sometimes alum is added to the sewage, this helps increase the formation of larger particles that settle out faster.
Answer:
This question lacks options, the options are;
A. All cells have a cell wall.
B. All cells arise from pre-existing cells.
C. All cells are capable of photoshynthesis.
D. All cells can develop into any other type of cell.
The answer is B.
Explanation:
The widely accepted universal cell theory is known to be contributed to by three scientists viz: Matthias Schleiden, Theodor Schwann and Rudolph Virchow.
As rightly stated in this question, Botanist Mathias Schleiden and Zoologist Theodor Schwann proposed that plants and animals are made up of cells in the year 1838 and 1839 respectively. However, in 1855, biologist Rudolph Virchow expanded the cell theory by adding that all living things are composed of cells and that these cells arise from pre-existing cells.
The collaboration of these three scientists brought about the cell theory that states:
* Cells are the basic unit of all living things.
* All living things are made up of one or more cells.
* All cells arise from pre-existing cells.
Answer:
The correct answer is c. cell fractionation
Explanation:
Cell fractionation is the technique which allows different cells part to be separated from each other on the basis of their density gradient by using a centrifuge.
In cell fractionation, first the cell wall and membrane of cells are broken by chemical, physical or mechanical method. Then the cell component can be separated by centrifuging them at different rpm.
Components that have higher density can be found in the bottom and the light density can be found on top of the tube. Therefore the correct answer is c. cell fractionation.