Answer:
mitochondrion
Mitochondria generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. A mitochondrion is thus termed the powerhouse of the cell. Mitochondria are commonly between 0.75 and 3 μm ² in area but vary considerably in size and structure. Unless specifically stained, they are not visible.
Explanation:
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The tricuspid valve is the valve that is located between the right atrium and the right ventricle but it does not direct blood to the lungs, it stops blood from flowing back into the right atrium. The pulmonary valve does in a way push the blood to the lungs, but it is located between the right ventricle and the pulmonary artery, not the right atrium and right ventricle.
Answer:
. Valora la importancia de los experimentos científicos en torno a la generación espon- tánea.
Explanat. Valora la importancia de los experimentos científicos en torno a la generación espon- tánea.
ion:
CD4 and CD 8 are molecules present on the surface of T cells where they interact with major histocompatibility (MHC) Molecules.
CD4 and CD8 improve T cell signalling by attaching to MHC class II (CD4) or MHC class I (CD8) molecules on APCs.
- The association of CD4 with MHC class II significantly decreases the number of antigenic peptides necessary for T cell activation (5) and significantly boosts cytokine output by helper T cells.
The MHC molecules' wide polymorphism is their distinguishing trait.
- This polymorphism is crucial for T cell antigen recognition.
- A T cell detects antigen as a peptide bound by a specific allelic variation of an MHC molecule and will not identify the identical peptide bound by other MHC molecules.
- This type of T cell activity is known as MHC limitation.
Hence, the correct answer is option C
Learn more about MHC here,
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# SPJ4
Separation of sister chromatids (D)
