PCAT Online Practice Questions and Answers

The breakdown of a disaccharide releases energy which is stored as ATP. This is an example of a(n):

A. Thermodynamic reaction

B. Exothermic reaction

C. Combination reaction

D. Replacement reaction

E. Endothermic reaction

If a substance has a constant half-life of 10 weeks, how many grams of a 12 g sample would remain after 30 weeks?

A. 8 g

B. 6 g

C. 3 g

D. less than 2 g

Rank the following compounds based on increasing acidity:

I. CH3CH2OH

II. CH3COCH3

III. CH3CH2COH

IV.

CH3CH2COOH

A.

II, III, IV, I

B.

II, IV, I, III

C.

II, III, I, IV

D.

IV, I, III, II

Separation of compounds by distillation is more efficient when:

A. carried out under reduced pressure

B. more condensation-vaporization cycles occur

C. carried out quickly

D. the condenser is very cold

Given the following reaction conditions, which statement is most accurate?

A. The reaction follows first-order kinetics and is a concerted reaction.

B. The reaction follows first-order kinetics and involves formation of a carbocation.

C. The reaction follows second-order kinetics and is concerted.

D. The reaction follows second-order kinetics and involves formation of a carbocation.

Sickle cell disease (SCD) affects millions of individuals worldwide, and the Sickle Cell Disease Association of America estimates that 70,000 to 100,000 individuals have SCD and 3 million individuals have the sickle cell trait. While SCD is known to primarily affect individuals of African American descent, individuals from South America, the Caribbean, Central America, the Middle East, and the Mediterranean can also have SCD or the SCD trait. SCD is estimated to affect 1 in 500 African American infants, and 1 in 12 African Americans are estimated to have the sickle cell trait. SCD is characterized by episodes of acute and chronic pain. By increasing awareness about SCD and promoting patient education, health care professionals can help patients and their families cope with SCD and better manage the associated pain. Recurring episodes of acute and/or severe pain are hallmarks of SCD. SCD pain can often be debilitating, and episodes of pain vary from patient to patient in both frequency and intensity. SCD pain can be classified as acute, chronic, or mixed. At some point, most SCD patients experience episodes of pain often referred to as vaso-occlusive crisis (sickle cell crisis), the duration of which may range from hours to days. Some patients seldom have a sickle cell crisis, while others may experience crises several times a year. Some episodes may be so severe that hospitalization is warranted to manage the pain. An acute pain event is the most common type of pain, and the onset is typically abrupt. It is often the result of an ischemic tissue injury, which is due to the occlusion of microvascular beds by sickled erythrocytes during an acute crisis. Acute pain episodes can also be triggered by factors including extreme temperature changes, changes in altitude, physical and emotional stress, illnesses, infections, dehydration, cold climates, menstruation, and fatigue. Chronic pain is pain that lasts for 3 to 6 months or longer. Chronic pain often results from the destruction of bones, joints, and visceral organs due to recurrent crises. Sources of chronic sickle cell pain include aseptic necrosis, leg ulcerations, and osteomyelitis. Unfortunately, acute and chronic pain associated with SCD are commonly undertreated or inappropriately managed due to patient fear of potential addiction and adverse effects. Many studies report that some health care professionals are also concerned about the potential for addiction. When appropriate, pharmacologic management of SCD pain may involve the use of 3 major pharmacologic classes: nonopioids, opioids, and adjuvants.

The passage as a whole can best be described as a:

A. Narrative

B. Persuasive essay

C. Expository essay

D. Scientific article

A man went to the store and bought pencils, pens, and erasers in the ratio of 2 : 4 : 3. If he bought 6 erasers then how many items total did he buy?

A. 9

B. 18

C. 12

D. 10

If a vector is multiplied by 4, which statement is false?

A. The second coordinate is 3 times the first.

B. The second coordinate is 8x greater than the first.

C. The second coordinate is 8x times the first.

D. After the multiplication, the second coordinate undergoes a greater overall change.

Ma'Tia drove 400 miles in 6 hours. She has an additional 180 miles to drive. If she drives at the same rate of speed, how long will it take her rounded to the nearest hour?

A. 3 hours

B. 2 hours

C. 4 hours

D. 1 hour

George can run 25 miles in the same amount of time that his brother, Alan, can run 15 miles. If George runs 3 miles per hour faster than Alan, how fast does Alan run?

A. 10

B. 4.5

C. 15

D. 7.6