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HESI Biology Practice Test 1

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Question 1 of 20

1. Question
Which one of these processes is not the same as the others?
- a. Krebs cycle
- b. Cyclic phosphorylation
- c. Aerobic cellular respiration
- d. Glycolysis
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Question 2 of 20

2. Question
Which one of these organisms is not an autotroph?
- a. Grass
- b. Algae
- c. Maple tree
- d. Mushroom
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Question 3 of 20

3. Question
What is an important characteristic of the scientific process?
- a. All scientists must agree on how to execute an experiment
- b. The data of the experiment must always support the hypothesis
- c. An experiment must be able to be repeated by other scientists
- d. Proving causation between variables
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Question 4 of 20

4. Question
Which of these organelles is likely to appear in high quantities in skeletal muscle tissue?
- a. Mitochondria
- b. Centrioles
- c. Golgi apparatus
- d. Vacuoles
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Question 5 of 20

5. Question
Which carbohydrate is found in plants but not in human tissue?
- a. Glucose
- b. Starch
- c. Cellulose
- d. Sugar
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Question 6 of 20

6. Question
Many point mutations in humans are caused by prolonged exposure to which of the following?
- a. UV radiation from the sun
- b. Certain foods
- c. Cold temperatures
- d. Errors in transcription by the Golgi apparatus
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Question 7 of 20

7. Question
DNA polymerase read DNA in the 3’ to 5’ direction, which means which of the following?
- a. The new strand is synthesized in the 3’ to 5’ direction.
- b. The new strand is synthesized in the 5’ to 3’ direction.
- c. The new strand is synthesized in both directions.
- d. The new strand is synthesized in alternate directions.
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Question 8 of 20

8. Question
A gray female rabbit with fur color alleles Bb mates with a black male rabbit with fur color alleles BB. What is the phenotype of the female rabbit?
- a. Bb
- b. BB
- c. bb
- d. Gray
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Question 9 of 20

9. Question
The appearance of new strains of coronavirus and antibiotic-resistant bacteria support what biological concept?
- a. Increasing populations versus carrying capacity
- b. Survival of the fittest
- c. Evolution of organisms
- d. Habitat succession
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Question 10 of 20

10. Question
Which one of these changes would not increase the rate of photosynthesis of a green plant?
- a. Adding more moisture to the roots
- b. Increasing the amount of carbon dioxide in the air around the plant
- c. Increasing the amount of oxygen in the air around the plant
- Increasing the exposure to sunlight
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Question 11 of 20

11. Question
A lizard, a hawk, and a salmon would share the same ___________ but be in a different ______________.
- a. Kingdom, phylum
- b. Phylum, class
- c. Class, order
- d. Order, family
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Question 12 of 20

12. Question
Which of the following statements is not true about mutations?
- a. A mutation is a change in the sequence of nucleobases in RNA or DNA.
- b. A mutation can have no effect.
- c. A mutation can cause a harmful change in protein structure.
- d. A somatic cell mutation will be passed on to that individual’s offspring.
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Question 13 of 20

13. Question
If a cell is placed in an isotonic solution, what will likely happen?
- a. The cell will swell
- b. The cell will shrink
- c. The cell will experience no change
- d. An equal amount of water will enter and exit the cell
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Question 14 of 20

14. Question
What type of bond connects the sugar and phosphate in DNA?
- a. Hydrogen
- b. Ionic
- c. Covalent
- d. Polar covalent
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Question 15 of 20

15. Question
Neurons must add sodium to the cell body to generate the final action potential. This process is done by which of the following?
- a. Leak channels
- b. Active transport
- c. Osmosis
- d. Passive diffusion
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Question 16 of 20

16. Question
A grasshopper, a trout, and a lion would all belong to which of the following?
- a. Class
- b. Phylum
- c. Kingdom
- d. Genus
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Question 17 of 20

17. Question
The function of a stop codon is which of the following?
- a. To initiate transcription with mRNA
- b. The point at which the chain is released into the cytoplasm
- c. To initiate translation of a protein chain
- d. A type of mutation
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Question 18 of 20

18. Question
Which of these macromolecules consist of polysaccharides and are broken down by an enzyme found in saliva and the pancreas?
- a. Proteins
- b. Carbohydrates
- c. Lipids
- d. Nucleic acids
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Question 19 of 20

19. Question
If two parents who are heterozygous for a gene that can cause a hereditary disease have a child, what is the probability that their child will also be a carrier?
- a. 25%
- b. 50%
- c. 75%
- d. 100%
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Question 20 of 20

20. Question
If you placed a human nerve cell in distilled water, the direction of osmosis will cause the cell
- a. To shrink
- b. To swell
- c. There will be no osmosis
- d. To shrink and swell the same amount
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HESI Biology Practice Test 1

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