Answer:
The main difference between coelomates and pseudocoelomates is the coelomates possess that is included, a ‘true’ coelom as their body cavity whereas pseudocoelomates possess a ‘false’ coelom.
Explanation:
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The thymus is the only lymphoid organ that does not D. fight the antigens directly.
- The thymus, bone marrow, spleen,lymph nodes, a network of lymphoid tissue along secretory surface (MALT), and the skin which performs the immune functions are known as lymphoid organs.
- On the basis of its role, lymphoid organ are classified into primary and secondary lymphoid organ.
- The lymphocytes from bone marrow are transformed into specialised T cells in the thymus. In this way thymus helps to improve the immune system
- T cells produced in the thymus is travels through the blood stream to lymphnodes and other parts of the body to fight against the antigen.
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Answer:
It is also worthy to note that Mendeleev's 1871 arrangement was related to the atomic ratios in which elements formed oxides, binary compounds with oxygen whereas today's periodic tables are arranged by increasing atomic numbers, that is, the number of protons a particular element contains.
Explanation:
Electron transport chain (ETC) refers to a series of complexes involved in the transfer of electrons from electron donors to electron acceptors through the reduction and oxidation reactions.
The similarities between the ETC in mitochondria and chloroplasts are as follows-
1. Both involve the electron transport chains on their inner membranes.
2. The energy produced pumps the protons against their concentration gradient across a membrane.
3. ATP synthase is used.
4. Two protons provide energy for the production of three molecules of ATP.
The differences between the ETC in mitochondria and chloroplasts are as follows-
Mitochondria- It uses the process of oxidative phosphorylation and chemical energy from the reduction-oxidation reactions. The electron transport chain occurs in the cristae. The coenzymes involved include the NAD and FAD. ATP synthase is located in the cristae. The protons are pumped out of the matrix. The final electron acceptor is the oxygen.
Chloroplast- It uses the process of photophosphorylation and the light energy. The electron transport chain occurs in the thylakoid membrane. The coenzyme involved is the NADP. ATP synthase is located in the thylakoid membrane. The protons are pumped into the thylakoids. The final electron acceptor is the chlorophyll in cyclic photophosphorylation and NADPH+ in the non-cyclic photophosphorylation.
