the head of a phospholipid
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HESI A2

Biology HESI A2 Practice Test

1. In a phospholipid molecule, the head:

Correct answer: D

Rationale: The head of a phospholipid is hydrophilic (water-loving) and is located on the outer side of the lipid bilayer, interacting with water molecules. This arrangement positions the hydrophobic tails inward, away from water. Therefore, the correct answer is D. Choice A is incorrect because the head is hydrophilic, not hydrophobic. Choice B is incorrect as the head is on the outer side, not the inner side of the layer.

2. Which phrase best completes the sentence: 'Despite _____, he managed to complete the race.'

Correct answer: A

Rationale: The correct answer is 'A: his injury.' In the context of completing a race, an injury would be a significant obstacle to overcome. While choices B, C, and D could also pose challenges, an injury is the most severe hindrance that would make completing a race particularly difficult. His condition, pain, or fatigue may affect performance, but they are not as directly impactful as an injury in this scenario.

3. What does the word BILATERAL mean?

Correct answer: A

Rationale: The word 'bilateral' means having or relating to two sides. It is often used to describe something that occurs on both sides, such as bilateral symmetry in which an object is symmetrical on two sides. Choice B, 'Straight,' does not capture the meaning of bilateral. Choice C, 'Symmetrical,' while related, does not specifically convey the idea of something pertaining to two sides. Choice D, 'On one side,' is the opposite of what bilateral means.

4. Which word is a synonym for ASSURED?

Correct answer: A

Rationale: The correct answer is 'Confirmed the truth of' because 'assured' means to make certain or confident. To confirm the truth of something is to provide certainty, which aligns with the meaning of 'assured.' Choice B, 'Sympathized with,' is incorrect as it means to express compassion or understanding, which is not synonymous with 'assured.' Choice C, 'Denied the truth of,' is incorrect as it means to reject or contradict the truth, which is the opposite of 'assured.' Choice D, 'Made known to,' is incorrect as it refers to revealing or informing, which is not synonymous with 'assured.'

5. When an individual is under stress, hormones are released. Which of the following is not one of the locations where hormones are released when under stress?

Correct answer: A

Rationale: The parathyroid gland is not a location where hormones are typically released during stress. It primarily regulates calcium levels in the blood through the release of parathyroid hormone (PTH). On the other hand, the adrenal cortex releases hormones like cortisol in response to stress, the posterior pituitary releases oxytocin and antidiuretic hormone, and the hypothalamus plays a crucial role in coordinating stress responses through the release of corticotropin-releasing hormone (CRH). Therefore, the parathyroid gland is the correct answer as it is not directly involved in the stress response pathway.

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