Answer:
Angina is a type of chest pain caused by reduced blood flow to the heart.
A chondroblast will produce the fibers and ground substance for cartilage
The statement that is true about polar covalent bonds is that the electrons are shared unequally. Thus, the correct option for this question is D.
<h3>What is a Polar Covalent bond?</h3>
A Polar covalent bond may be characterized as a type of covalent bond in which the electron density is unevenly shared between the two bonded atoms, due to a difference in electronegativity or due to inductive effects.
According to the context of this question, in a polar covalent bond, the electrons are unequally shared by the atoms and spend more time close to one atom than the other.
This is because of the unequal distribution of electrons between the atoms of different elements, slightly positive (δ+) and slightly negative (δ–) charges develop in different parts of the molecule.
Therefore, the statement that is true about polar covalent bonds is that the electrons are shared unequally. Thus, the correct option for this question is D.
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Answer:
They are thick, strong and made up of thousands of tubulin which are spiral in shape.
Explanation:
In eukaryotic cells, they have microtubules which are fibres serving as tracks for cell to cell transport and regulate the shape of a cell.
Microtubules are different from other cytoskeletal filaments because they possesses a cylindrical shape with the tube having a larger diameter of 20-25 nm as compared to microfilament that have a diameter of 3-6 nm.
Microtubules are made of subunits of proteins called tubulin named alpha and beta that is not present in other cytoskeletal filaments.