which part of the eye controls the amount of light that enters the eye

ATI TEAS 7

ATI TEAS Practice Test Science

1. Which part of the eye controls the amount of light that enters the eye?

A. Cornea
B. Iris
C. Retina
D. Lens

Correct answer: B

Rationale: The iris is the correct answer as it controls the amount of light that enters the eye by adjusting the size of the pupil. The cornea is responsible for focusing light onto the retina, the retina detects light at the back of the eye, and the lens helps in further focusing light onto the retina. The iris, through changing the size of the pupil, regulates the amount of light reaching the eye, making it the part that controls the entry of light.

2. What defines rational and irrational numbers?

A. Any number that can be expressed as a fraction; any number that cannot be expressed as a fraction
B. Any number that terminates or repeats; any number that does not terminate or repeat
C. Any whole number; any decimal
D. Any terminating decimal; any repeating decimal

Correct answer: A

Rationale: Rational numbers are those that can be written as a simple fraction, including whole numbers and decimals that either terminate or repeat. Irrational numbers, on the other hand, cannot be expressed as fractions. Choice B is incorrect because not all rational numbers necessarily terminate or repeat. Choice C is incorrect as it oversimplifies the concept of rational and irrational numbers by only considering whole numbers and decimals. Choice D is incorrect as it inaccurately defines rational and irrational numbers solely based on decimals terminating or repeating, excluding the broader category of fractions.

3. What most likely describes the relationship between the author and Alan?

A. competitive
B. formal
C. friendly
D. caring

Correct answer: C

Rationale: The most likely description of the relationship between the author and Alan is friendly. The author's message to Alan is filled with warmth, concern, and offers of help, indicating a positive and supportive tone. The use of phrases like 'I just wanted to drop you a quick note' and 'Let me know if you want any special treats' reflect a friendly and amicable relationship. Choices A, B, and D are not as suitable as competitive, formal, or caring relationships do not align as strongly with the friendly and supportive nature of the interaction described in the text.

4. The plump old white cat basked in the warm sunlight. Which of the following options correctly punctuates the above?

A. The plump, old, white cat basked in the warm sunlight.
B. The plump, old, white, cat basked in the warm sunlight.
C. The plump, old white cat basked in the warm sunlight.
D. The plump old white cat, basked in the warm sunlight.

Correct answer: A

Rationale: The correct answer is A: 'The plump, old, white cat basked in the warm sunlight.' Commas should be used to separate coordinate adjectives describing the cat. In this sentence, 'plump,' 'old,' and 'white' are coordinate adjectives, each providing distinct information about the cat. Option B incorrectly places a comma after 'white,' creating a nonessential element. Option C lacks commas to separate the coordinate adjectives. Option D incorrectly places a comma after 'cat,' causing a punctuation error.

5. Which of the following pathologies is caused by a virus?

A. Asthma
B. Cystic Fibrosis
C. Epiglottitis
D. Influenza

Correct answer: D

Rationale: The correct answer is D, Influenza. Influenza is a viral infection caused by the influenza virus. Asthma and cystic fibrosis are not caused by viruses. Asthma is a chronic respiratory condition related to inflammation and airway constriction, while cystic fibrosis is a genetic disorder affecting the lungs and other organs. Epiglottitis is most commonly caused by bacteria, particularly Haemophilus influenzae type B, rather than a virus.