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HESI A2 Biology question and answer study guide

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This comprehensive HESI A2 Biology study guide is your all-in-one resource for acing the nursing entrance exam. Compiled from verified exam content, this document covers EVERYTHING you need to know – from basic biology concepts to detailed human anatomy and physiology. What's included: · 200+ exam-style Q&A with correct answers and explanations · Complete biology coverage: Cell structure, organelles (mitochondria, ribosomes, ER, Golgi), cellular respiration (glycolysis, Krebs cycle, ETC), photosynthesis, DNA/RNA structure and function, mitosis & meiosis · Human anatomy & physiology: All major organ systems – skeletal, muscular, nervous, endocrine, cardiovascular, respiratory, digestive, urinary, and reproductive systems · Key definitions & terminology – over 100 medical and biological terms with clear explanations · Useful reference data: Metric conversions, temperature conversions, Roman numerals, and 24-hour time format · Grammar & writing essentials – parts of speech, sentence structure, common errors (lay vs. lie, fewer vs. less, affect vs. effect)

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What is the largest, most inclusive category in biology? What is the most
restrictive?

Kingdom; species



Water has a relatively high __________ value, which allows water to resist shifts
in temperature.
Water has a relatively high specific heat value, which allows water to resist shifts in
temperature.



Why is polarity the most important characteristic of water?

The results of the polarity are hydrogen bonding, a high specific heat value, and its
versatile solvent properties.



In the scientific process, which is a statement or explanation of certain
events/happenings?

Hypothesis



Which organelle would you expect to be present in a cell for detoxifying multiple
molecules?

Smooth endoplasmic reticulum



A cell from heart muscle would more than likely contain an unusually high
proportion of:

Mitochondria



The sum of all chemical reactions that occur within an organism is called…?

Metabolism



A cell that does not contain membrane-bound organelles or a defined nucleus
would be classified as…?

,Prokaryotic



The two catabolic pathways that lead to cellular energy production are:

Cellular respiration and fermentation



Which part of cellular respiration produces the most ATP?

Electron transport chain



When plants do not receive enough water, their photosynthetic rate drops. This is
because…?

Water is a raw material for the light reactions in photosynthesis



How does asexual reproduction differ from sexual reproduction?

Sexual reproduction involves two cells that contribute genetic material to daughter cells,
resulting in significantly greater variation



Why is it important for cells to undergo mitosis?

Mitosis produces cells for growth and repair of body tissue



72 chromosomes undergo meiosis. How many chromosomes will be in each
gamete?
36



Which of the following shows how information is transformed to make a protein?

DNA -> RNA -> Protein



How many neutrons does Carbon-14 (14^C) have? (hint: atomic number = # of
protons)

,8 neutrons



What would be the oxidation state of the sulfur atom in sulfuric acid (H2SO4)?

+6



What is the strongest type of chemical bond?

Covalent bond



What do acids do with protons?

Donate them



When two monosaccharides join, what is made?
Disaccharide



Where are DNA and RNA found?

In the cell nucleus



What is the correct term for MgSO4?
Magnesium Sulfate



How many amino acids are in a dipeptide?

2 amino acids



Glycogen is a…?

Plant starch



Gluconeogenesis is the process in which…?

, Glucose is formed from proteins and fats



What is a pentose?

5 carbon sugar



How many amino acids are essential for human life?

20 amino acids



Histology is the study of…?

Tissues



What are the four types of tissues?
1. Epithelial – cover and line the body and it’s internal organs

2. Connective – body’s framework

3. Muscle

4. Nervous – composed of neurons and connective tissue cells (neuroglia)



What is the basic unit of life?
Cell



What are the major parts of the brain and what do they control/do?

1. Cerebrum – movement and sensory input

2. Cerebellum – muscular coordination

3. Medulla oblongata- RR and HR

What is the role of progesterone?

Stimulates the development of the endometrium

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