Answer:
B. a nucleus
Explanation:
cell walls and chloroplast are both found in plant cells, not in animal cells
Marine biologists study changes in the ocean. so they will look at the chemical composition of deep waters and see how consecrated the oxygen is. They will also study the movements of the plates because when planted move it usually makes new food for deep life
they will also check animal concentrations in certain areas.
Another thing they do is track animal movements. this could be by putting a tracker on a whale or a shark or anything and watching its depths it goes or watching the distance it goes in a day.
27. Vacuole.
28. Chloroplasts.
29. Nuclear Membrane.
30. Golgi Apparatus.
31. Nucleolus.
32. Cytoplasm.
33. Cell Membrane.
34. Lysosome.
35. Smooth ER.
36. Cytoskeleton.
37. Nucleoplasm.
38. Rough ER.
39. Central Vacuole.
40. Chloroplast.
41. Chromoplast.
43. Vacuole.
44. Cell Wall.
45. Rough ER.
46. Lysosome.
(I couldn't see the last few, so.)
If the graphic shows two isomers of a chemical compound with molecular formula C5H11NO2, the type of isomers that are shown is structural isomers. Option A.
<h3>What are structural isomers?</h3>
A structural isomer of a chemical is a different compound having the same number of atoms of each element as the original compound but with logically separate bonds connecting them. Previously, the same idea was referred to as a metamer.
Though they have identical chemical formulae, structural and constitutional isomers differ in how their atoms are arranged. Skeletal isomers, positional isomers, and functional group isomers are the three different categories of structural isomers.
Chain isomerism is one of three varieties of structural isomerism. isomerism in functional groups. isomerism in position.
Compounds with distinct structural formulae but the same molecular formula are known as isomers. Every sort of atom is present in the same quantity.
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Cytotoxic t-cells are able to recognize infected body cells because <u>the</u> <u>infected cells display foreign antigens</u>.
<h3>What do cytotoxic killer T cells do?</h3>
The helper T cell and the cytotoxic T cell are the two main subtypes of T cells. Helper T cells, as their names imply, "assist" other immune system cells, whereas cytotoxic T cells "kill" virally-infected cells and tumors. The TCR cannot directly bind antigen, unlike an antibody.
Killer T cells are also known as "cytotoxic" or "cytolytic" cells because they have unique molecular weapons that allow them to attack and kill other cells that are showing targets they are familiar with, such as a virus-infected cell or even a malignant cell. The processed cancer cell antigen, which is solely presented by MHC-class I, must be recognized by cytotoxic T lymphocytes. Helper T cells binding to a processed antigen on the same dendritic cell as the MHC-class II presenting a processed cancer cell antigen enhances cytotoxic T-cell complete activation.
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