Answer:
b. atom is the basic unit of matter
Explanation:
Hardness and luster, I would say, sorry if I am wrong
Microfilaments
Microfilaments are fine, thread-like protein fibers, 3-6 nm in diameter. They are composed predominantly of a contractile protein called actin, which is the most abundant cellular protein. Microfilaments' association with the protein myosin is responsible for muscle contraction. Microfilaments can also carry out cellular movements including gliding, contraction, and cytokinesis.
Microtubules
Microtubules are cylindrical tubes, 20-25 nm in diameter. They are composed of subunits of the protein tubulin--these subunits are termed alpha and beta. Microtubules act as a scaffold to determine cell shape, and provide a set of "tracks" for cell organelles and vesicles to move on. Microtubules also form the spindle fibers for separating chromosomes during mitosis. When arranged in geometric patterns inside flagella and cilia, they are used for locomotion.
Hope this helps :)
The answer is; electromotive force
As the Krebs cycle/ Citric cycle occurs in the mitochondria matrix, hydrogen protons are produced and get accumulated in the inter-membrane space from the matrix of the organelle. It is this electromotive force that is harnessed by the ATP synthase to produce ATP.
Nuclear reactions emit a lot of radiation.
