Chemical Reactions and Energy Changes

Question 1

What is biochemistry

Answer 1

Study of activites and properties of molecules that are important to living systems

Question 2

What is a cell

Answer 2

The smallest unit of life that can exist on its own as a single-celled organism or part of multi-celled organism. Cells and the components within cells are made up of atoms and molecules.

Question 3

Which four elements are the most common in the human body.

Answer 3

Carbon, Hydrogen, Oxygen, and Nitrogen. Making up a combined 96% of the human body.

Question 4

How much of the human body does each element take up

Answer 4

Oxygen: 65%
Carbon: 18%
Hydrogen: 10%
Nitrogen: 3%

Question 5

Why does life exist

Answer 5

Because of chemical reactions that occur in cells. In a chemical reaction, atoms of elements and compounds are rearranged to become different substances with different properties.

Question 6

What are reactants

Answer 6

They are transformed into products. During the process, some chemical bonds break and new ones form. Energy is either absorbed or released.

Question 7

What is ATP

Answer 7

ATP is an energy-carrying molecule that releases energy when it loses a phosphate In any chemical reaction, the difference in energy absorbed to break bonds and energy is released when new bonds forming results in a NET absorption or release of energy. In the breakdown of ATP, overall energy is released. This energy can be used by cells to carry out life functions.