Question

__________, which is an essential biological compound found in DNA and amino acids that make up proteins, occurs in the atmosphere in an unusable form.
This element must undergo the process of __________, which is facilitated by bacteria in the roots of plants.

a.)
Nitrogen; fixation

b.)
Hydrogen; transpiration

c.)
Hydrogen; photosynthesis

d.)
Nitrogen; transpiration

Answer 1

Answer: Nitrogen; fixation

Explanation:

Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.

Fixation consists of two steps: cessation of normal life functions in the tissue (killing) and stabilization of the structure of the tissue (preservation). The goal of fixation is to preserve structure as faithfully as possible compared to the living state.