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HESI A2 · Biology · Biology HESI A2 Practice Test

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

The mixture of gases surrounding a planet is referred to as its ______.

A. Atmosphere

B. Stratosphere

C. Biosphere

D. Troposphere

Correct Answer: Atmosphere

Question 2 of 5

Cytosine and thymine are known as:

A. Purines

B. Pyrimidines

C. Both

D. None of the above

Correct Answer: Pyrimidines

Question 3 of 5

What are the three main events of the haploid cell cycle?

A. DNA replication, mitosis, and cytokinesis

B. DNA replication, meiosis, and cytokinesis

C. DNA replication, cytokinesis, and degradation

D. Mitosis, meiosis, and apoptosis

Correct Answer: DNA replication, mitosis, and cytokinesis

Question 4 of 5

Which system maintains the body's balance through the release of hormones directly into the bloodstream?

A. The gastrointestinal system

B. The endocrine system

C. The digestive system

D. The endocrine system

Correct Answer: The endocrine system

Question 5 of 5

Which of the following is always true about molecules?

A. They cannot travel through all cell membranes

B. They move from low concentration to high concentration without using energy

C. They move from high concentration to low concentration without using energy

D. They cannot move

Correct Answer: They move from high concentration to low concentration without using energy

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