8. Classification of living things takes into consideration all of the following except A. presence of cell membranes.
B. mode of nutrition.
C. presence of a nucleus.
D. number of cells.

D: A new gene, which codes for the protein that can repair defective genes, is introduced.

Particular A shown in the image is called protons, as option B shows.

What are Atoms?

• It is the basic unit of matter.
• It is a particle composed of electrons, protons, neutrons, nucleus and electrosphere.

An atom of any element is made up of a nucleus and an electron shell. In the electrosphere, there are small particles with a negative charge. These particles are called electrons.

In contrast, the nucleus has two types of particles, protons that have a positive charge and neutrons that have no charge.

Therefore, when we observe the image shown in the image above, we can see that there are particles with a positive sign, inside the nucleus of the atom. These particles are protons.

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The size of the sediments from the smallest to the largest is clay followed by silt and then sand.

What is soil texture?

It refers to the relative particle size composition of the soil. In the soil, the particle size composition refers to the percentage of the mineral matter by weight in each fraction. On the basis of the International Society of the Soil Science, the size of the various types of soils are:

• Clay less than 0.002
• Silt between 0.002 to 0.02
• Fine sand between 0.02 to 0.20
• Coarse sand between 0.20 to 2.0

Thus, the correct order of sediment size from smallest to largest will be clay-silt-sand.

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clay - silt - sand the answer is correct I took the test and sand-silt-clay is wrong

Cryptosporidium parvum is a pathogenic agent that causes the disease cryptosporidiosis. The pathogen obtains glucose directly from the host. It can also obtain by the breakdown of polysaccharides.

C. parvum produces ATP through glycolysis. The enzyme lactate dehydrogenase is used by the C. parvum to generate metabolic ATP. It generates this ATP through the glycolytic pathway. The enzyme allows the conversion of NADH to NAD+. NAD+ is necessary for glycolysis to produce ATP. Metabolic energy plays a crucial role in the growth and proliferation of the pathogen in the host.

Some of the features of C. parvum are:

• It consists of a unique lactate dehydrogenase enzyme to yield ATP.
• It causes the disease in the gastrointestinal tracts.
• The pathogen is used for research and understand its ability to obtain ATP directly from the host.

Therefore, C. parvum consists of enzyme lactate dehydrogenase that helps in energy production through the glycolytic pathway.

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Answer:

Cryptosporidium parvum is an apicomplexan pathogen that obtains glucose either directly from its host or by the degradation of polysaccharides.

Explanation:

C. parvum only can produce ATP by glycolysis. Lactate dehydrogenase (LDH) is a universal enzyme required to synthesize pyruvate, which is the final product of the glycolysis process. This enzyme has been subject of research to understand the metabolism and evolution of apicomplexan parasites, including C. parvum.

Answer;

b. leaching

Minerals found in the B horizon were dissolved in water and carried there by a process called leaching

Explanation;

• Leaching is the process in which minerals are dissolved in water and carried down in a soil profile.
• Leaching occurs as a result of heavy rainfall, high temperature and percolation, which leads to loss of mineral and organic solutes.
• The process occurs when air spaces in soil become filled with water and gravity begins to move water downward. Some soils such as Laterite soils develop due as a result of leaching.