The DNA double helix is held together by two types of bonds, covalent and hydrogen. Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing. These hydrogen bonds are individually weak but collectively quite strong.
Answer:
Most of the cholesterol molecule in non-polar and therefore associations with the non-polar fatty acid tails of the phospholipids. However, the hydroxyl group (-OH) on cholesterol carries a negative charge and therefore associates with the polar environment of water either inside the cell or outside.
Explanation:
Mark me brainly please
Answer:
vacuoles – transport
cell wall – protect
nucleus – control
Explanation:
Vacuole is a small sac containing fluid and helps in the transport of substances within and outside the cell
Cell wall is external to the cell membrane and serves a structural function helping the cell maintain its shape and PROTECTING the cell from damage.
Nucleus is an organelle found in cells of plants and animals. It contains genetic information in DNA or RNA, and CONTROLS the entire life process
Note that mitochondria helps to provide ENERGY to build up substances in the cell NOT DECOMPOSE
Reactants = glucose, oxygen
Products = water, carbon dioxide, Energy in ATP