MTTC Biology (017) case studies
MTTC Biology (017) · Put your knowledge to work in context.
Biology (017) is one of the subject-matter tests in the Michigan Test for Teacher Certification (MTTC) program, listed on the official site with endorsement codes DA and IA. Candidates take it to demonstrate biology knowledge for educator certification in Michigan; the score report is one piece of the state's endorsement requirements, and the Michigan Department of Education - not the testing vendor - decides what each endorsement requires. The MTTC Biology (017) case studies are 5 cases and about 3,292 words.
1Catalase Kinetics with a Moving Temperature
During a unit on enzymes, a student tests catalase activity in potato extract by measuring oxygen gas produced in 30 s. Five tubes each contain 10 mL of hydrogen peroxide at 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%.
625 words, about 3 min2Recurrence Risk in a Family with an Affected Daughter
Both parents are healthy and have three children: an unaffected son (age 9), an affected daughter (age 6), and an affected son (age 3). The two affected children have the same rare metabolic disorder, which has an incidence of about 1 in 60,000 in the general population.
669 words, about 3 min3Deer Exclosures on a Road Edge
A land trust wants to know whether white-tailed deer are preventing oak regeneration in a 60-ha preserve. Staff establish eight 5 m × 5 m deer exclosures and eight paired unfenced plots, each pair 20 m apart.
683 words, about 3 min4Ouabain, Membrane Potential, and Cell Swelling
In a physiology lab, cultured neurons are bathed in normal saline and then exposed to 10 µM ouabain, a specific inhibitor of the Na+/K+-ATPase. Within 10 minutes, intracellular Na+ rises from 12 mM to 38 mM, intracellular K+ falls from 140 mM to 105 mM, and the resting membrane potential changes from −70 mV to −58 mV.
669 words, about 3 min5Daphnia Spines After an Invasion
A class monitors a lake before and after an invasive predatory zooplankter is first detected. From 2019 to 2024, mean Daphnia body length falls from 1.4 mm to 0.9 mm, and the frequency of a long-spine morph rises from 10% to 65%.
646 words, about 3 min