The white pulp of the spleen areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes. Hence, option D is correct.
The lymphoid organs include the red bone marrow, thymus, spleen and clusters of lymph nodes.
Both white and red pulp contains lymphocytes and immune cells called macrophages. These cells dispose of antigens, dead cells, and debris by engulfing and digesting them. While the spleen functions chiefly to filter blood, it also stores red blood cells and platelets.
Hence, The white pulp of the spleen areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes.
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A 9:3:3:1 phenotypic ratio suggests that the traits being observed follow Mendelian inheritance patterns. In Mendelian genetics, a 9:3:3:1 ratio is characteristic of a dihybrid cross involving two genes that assort independently.
This ratio indicates that there are two traits being considered, and each trait is controlled by different genes. The 9 represents the dominant phenotype for both traits, the 3s represent the different combinations of the two recessive phenotypes, and the 1 represents the double recessive phenotype for both traits.
Overall, this suggests that the two traits are not linked and are segregating independently during the formation of gametes. This phenotypic ratio is often observed in crosses involving two heterozygous individuals for two unlinked genes.
Answer:
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Explanation:
Organism characteristics are influenced by the amino acid sequences of proteins coded by their DNA. Amino acids vary in chemistry and structure thereby causing variation in protein structure and function. Similarities in sequences can infer close evolutionary relationships.
The characteristics of an organism are fundamentally determined by the amino acid sequences of its proteins. Protein sequences, composed of the 20 common amino acids, are coded by the DNA molecule in the cell. Therefore, the sequence of a DNA molecule plays a significant role in understanding an organism's identity and function.
Different amino acids have different chemistries and structural constraints, thus causing enormous variation in protein structure and function. This variety is responsible for the diversity and complexity of life. For instance, the human cytochrome c protein contains 104 amino acids, but when compared to the same protein in different organisms, only 37 of these amino acids appear in the same position. This suggests these organisms are descended from a common ancestor.
Moreover, the 3-dimensional structure of proteins, determined by the amino acid sequence, contains significant information about evolutionary relationships. These relationships can be inferred from variations over time of the nucleotide sequence of a gene. The more similar these sequences are in two organisms, the more closely related they are.
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Answer: A kid or a billy
yep its b have a nice day :)
Answer:
the calvin cycle
Explanation:
Answer:
calvin cycle
Explanation: