Hey there! Let's solve the problem:
CD4 T cells activate CD8 T cells through an underhanded cycle including an antigen presenting cell (APC), customarily a standard dendritic cell (DC). An APC presents a peptide to a true CD4 T cell through a Class II MHC molecule.
Answer:
I think it is the first one
Explanation:
I
Protein. A chain of amino acids, known as a polypeptide chain, makes up a protein. Foods that contain protein include meat, dairy, eggs, soy, nuts, etc. Hope this helped :)
The correct answer is A. Quantitative traits
Explanation:
In genetics, quantitative traits refer to traits or phenotypes (observable traits) that depend on many factors including multiple genes and actions in the environment. These traits differ from other traits because the traits tend to be more diverse in a population. In the case presented, the shell color in clams is an example of a quantitative trait because this phenotype is the result of three different each and each gene contains two alleles which means the color depends on many factors. Additionally, as most quantitative traits there is a higher variation in the phenotype considering clams can have different hues.
E. coli bacteria would not have a well defined nucleus, because bacteria are prokaryotic cells.
The onion cell and the human brain cell would be eukaryotic cells, which do have nuclei.