4. Alcohols have hydroxyl groups (-OH), organic acids have (blank) groups. Amino acids have nitrogen in a (blank) group, but since they are acids, they also have a (blank) group. The building block of DNA is nucleotides, which includes a 5- sugar called (blank), a nitrogenous base,
And a (blank) group.

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.

The right answer is c.sandstone.

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord.