PAX PAX Biology 3

Question 1

What is the basic unit of life?

Accepted Answer

Cell

Answer

The cell is the smallest structural and functional unit of all living organisms.

Question 2

Which macromolecule serves as the primary energy source for the body?

Accepted Answer

Carbohydrates

Answer

Carbohydrates are the body's preferred and most readily available source of energy.

Question 3

What does the term 'homeostasis' refer to?

Accepted Answer

The body's maintenance of a stable internal environment

Answer

Homeostasis is the process by which the body maintains a stable internal environment (e.g., temperature, pH, glucose levels) despite external changes.

Question 4

Which molecule carries genetic information from the nucleus to the ribosome?

Accepted Answer

mRNA

Answer

Messenger RNA (mRNA) carries the genetic code from DNA in the nucleus to the ribosomes where proteins are synthesized.

Question 5

The human body has how many pairs of chromosomes?

Accepted Answer

23

Answer

Humans have 23 pairs of chromosomes (46 total), with one chromosome in each pair inherited from each parent.

PAX Exam Practice Test

PAX Exam Practice Test

PAX PAX Biology 3