Free Test Prep PCAT Exam Questions

If ƒ(x) = 3x and g(x) = 2x2, what is g(ƒ(−2))?

A lab requires 0.76 L of a solution. How many 100 mL vials must be used in the lab?

Coughs that linger after a cold or sinus problem cause constant disruption in the home, school, and workplace.Often, these dry, nonproductive coughs become increasingly troublesome although other symptoms – fever,congestion, and fatigue – resolved days or weeks ago. This stubborn cough persists for weeks, and plagues itsvictim and the victim’s family night and day. The diagnosis might be a common, but overlooked cause oflingering cough: atypical pneumonia caused by mycoplasma. Mycoplasma – pleomorphic bacteria that lack acell wall – are the smallest and simplest self-replicating organisms known to humans. They probably evolvedfrom gram-positive, walled eubacteria by degenerative evolution. Smaller than amoebas, these 0.1-micrometerorganisms grow and reproduce slowly and require no oxygen or host cell. They also change shapesasymmetrically, appearing as long, thin filaments, tiny spheres, or branches. Scientists have identified morethan 100 mycoplasma species. Fifteen species are known to live in humans, most as normal symbiotic flora.Mycoplasma pneumoniae, previously called “walking pneumonia,” is pathogenic in humans. Mycoplasmapneumoniae glides freely and uses its specialized filamentous tips to burrow between cilia within the respiratoryepithelium, causing the respiratory epithelial cells to slough. It also produces hydrogen peroxide, which causesinitial cell disruption in the respiratory tract and damages erythrocyte membranes. Researchers havedetermined that more than 40% of infants younger than 1 year old have had a mycoplasma infection. By age 5,approximately 65% of children have been infected. Nearly all adults have been infected at least once, oftenrepeatedly. Mycoplasma pneumonia usually affects people younger than 40 years of age. The highestincidence is found in the 5- to 9-year age group. The risk of contracting mycoplasma pneumonia is greatest forpeople who live or work in crowded areas, such as daycare facilities, schools, homeless shelters, long-termcare units, and military and prison environments. However, many people who develop mycoplasma infectionshave no identifiable risk factor. Most mycoplasma infections cause mild to moderate clinical symptoms, but theinfection incubates over 3 weeks and can last weeks without treatment. This infection cannot be diagnosedbased on symptoms alone; laboratory testing is essential. Infection can also cause ear infections, sinusinfections, bronchitis, croup, severe sore throats, infectious asthma, and 1 type of the common cold. Whenmycoplasma infects children, about 25% of them develop nausea, vomiting, or diarrhea.Which of the following is NOT true about mycoplasma infection?

In which of the following stages of embryo development are the three primary germ layers first present?

Which of the following does hemoglobin bond most strongly with?