1. Which of the following is the correct order of biological

organization from the simplest to the most complex level?

a) cell, tissue, organ, organ system, organism

b) organism, organ system, organ, tissue, cell

c) tissue, cell, organ, organism, organ system

d) organ system, organism, organ, tissue, cell

Answer: A. The simplest level of biological organization is the

cell, which is the basic unit of life. Cells are grouped into tissues,

which are collections of similar cells that perform a specific

function. Tissues are organized into organs, which are structures

that carry out a specialized task in the body. Organs work

together in organ systems, which are groups of organs that

coordinate their functions. Finally, an organism is a living entity

that consists of one or more organ systems.

2. What is the main function of mitochondria in eukaryotic cells?

a) to produce energy in the form of ATP

b) to synthesize proteins from amino acids

c) to store genetic information in the form of DNA

d) to digest cellular waste and foreign substances

Answer: A. Mitochondria are organelles that are responsible for