dat destroyer

Test your DAT and OAT Biology knowledge with this question on Hashimoto’s disease. Choose your answer before checking the solution in the second image. Free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano

Can you identify the biology term that describes differences in appearance or behavior between males and females of the same species? Choose your answer before checking the solution on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT...

Can you identify the biology term that describes differences in appearance or behavior between males and females of the same species? Choose your answer before checking the solution on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT...

A medical laboratory wants to increase its daily average number of patients screened. Can you determine how many patients must be screened on the seventh day? Choose your answer before checking the solution on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano...

A medical laboratory wants to increase its daily average number of patients screened. Can you determine how many patients must be screened on the seventh day? Choose your answer before checking the solution on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano...

Hemoglobin carries oxygen from the lungs to tissues throughout the body. How well do you know the quaternary structure of normal adult human hemoglobin? Choose your answer before checking Dr. Romano’s explanation on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano...

Hemoglobin carries oxygen from the lungs to tissues throughout the body. How well do you know the quaternary structure of normal adult human hemoglobin? Choose your answer before checking Dr. Romano’s explanation on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano...

A wood factory wants to increase its monthly production by 50%. Can you determine how many additional logs must be produced each workday? Choose your answer before checking the solution on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT...

A wood factory wants to increase its monthly production by 50%. Can you determine how many additional logs must be produced each workday? Choose your answer before checking the solution on the second slide. Free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT...

Mixture and concentration problems are important topics for the DAT and OAT Quantitative Reasoning sections. In this video, Dr. Jim Romano demonstrates how to calculate percentages and concentrations when two different mixtures are combined or diluted. Watch the complete lesson: Free DAT...

Mixture and concentration problems are important topics for the DAT and OAT Quantitative Reasoning sections. In this video, Dr. Jim Romano demonstrates how to calculate percentages and concentrations when two different mixtures are combined or diluted. Watch the complete lesson: Free DAT...

Which brain structure is most involved in pulling up and combining past memories to help create storylines? For more free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano Choose your answer before...

Which brain structure is most involved in pulling up and combining past memories to help create storylines? For more free DAT and OAT preparation resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano Choose your answer...

I have worked with thousands of DAT and OAT students through the years, and one question I get asked over and over is: What study schedule should I follow? One of the biggest mistakes I see students make is trying to follow a study schedule created by someone else. No one else knows your...

I have worked with thousands of DAT and OAT students through the years, and one question I get asked over and over is: What study schedule should I follow? One of the biggest mistakes I see students make is trying to follow a study schedule created by someone else. No one else knows your...

A compound with the molecular formula C8H10 is oxidized to benzoic acid using hot acidic dichromate. Which compound must it be? Work through the molecular formula and oxidation chemistry before checking the second image for Dr. Romano’s explanation. Free DAT and OAT study resources from Dr...

A compound with the molecular formula C8H10 is oxidized to benzoic acid using hot acidic dichromate. Which compound must it be? Work through the molecular formula and oxidation chemistry before checking the second image for Dr. Romano’s explanation. Free DAT and OAT study resources from Dr...

Understanding when a reaction proceeds by SN1, SN2, E1, or E2 is essential for DAT and OAT Organic Chemistry. In this lesson, Dr. Jim Romano works through these reaction mechanisms and explains how to recognize the differences between substitution and elimination reactions. More free DAT and...

Understanding when a reaction proceeds by SN1, SN2, E1, or E2 is essential for DAT and OAT Organic Chemistry. In this lesson, Dr. Jim Romano works through these reaction mechanisms and explains how to recognize the differences between substitution and elimination reactions. More free DAT and...

For a limited time, save 15% on all individual DAT and OAT study books from Dr. Jim Romano and the Destroyer team. Use code AUGUST15 at checkout on orgoman.com. Sale ends August 23. Individual books only. Bundles are excluded from this promotion because bundles are automatically discounted...

Can you solve this one? Check the second image for Dr. Romano’s solution. Free DAT and OAT study resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano

DAT and OAT General Chemistry | DAT Destroyer | OAT Destroyer | Dr. Jim Romano Can you solve this one? Check the second image for Dr. Romano’s solution. Free DAT and OAT study resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano...

We’re celebrating with a 2026 OAT Destroyer Book Giveaway! If you know a pre-optometry student preparing for the OAT, please feel free to share this with them. One student will win a brand-new 2026 OAT Destroyer by Dr. Jim Romano, with shipping included to a U.S. or Canadian address. No...

Another DAT Destroyer Student Success! One of our summer students shared these latest DAT scores with us: Organic Chemistry: 560 Total Science: 510 Academic Average: 480 The student shared: “Thank you, Dr. Romano. I came to you with a weak foundation in the sciences, especially Organic...

Review mean, median, mode, variance, and standard deviation for the DAT and OAT Quantitative Reasoning sections. This video works through basic statistics concepts and calculations that DAT and OAT students should understand for test day. Keep practicing and keep Destroying! Free DAT & OAT...

Review mean, median, mode, variance, and standard deviation for the DAT and OAT Quantitative Reasoning sections. This video works through basic statistics concepts and calculations that DAT and OAT students should understand for test day. Free DAT & OAT preparation resources from Dr. Jim...

Birds and dinosaurs provide an interesting way to review evolutionary history for the DAT and OAT. Test yourself with the question in the first image before checking Dr. Jim Romano's explanation in the second image. Keep practicing and keep Destroying! Free DAT & OAT Resources from Dr. Jim...

Birds and dinosaurs provide an interesting way to review evolutionary history for the DAT and OAT. Test yourself with the question in the first image before checking Dr. Jim Romano's explanation in the second image. Keep practicing and keep Destroying! Free DAT & OAT Resources from Dr. Jim...

DAT & OAT Biology Challenge! Iron transport, storage, and utilization are important concepts to understand for the DAT and OAT. Keep practicing and keep Destroying! Dr. Jim Romano DAT Destroyer | OAT Destroyer Test yourself before checking Dr. Romano’s answer and explanation on the...

DAT & OAT Biology Challenge! Iron transport, storage, and utilization are important concepts to understand for the DAT and OAT. Keep practicing and keep Destroying! Dr. Jim Romano DAT Destroyer | OAT Destroyer Test yourself before checking Dr. Romano’s answer and explanation on the second...

Our Fall 2026 Live Online DAT & OAT Prep Course begins September 13, 2026. Prof. Denis Barengolts teaches the live online course, with Dr. Jim Romano joining each class for the first 30–60 minutes for high-yield instruction, guidance, and strategy. Course Dates: September 13 – December 6, 2026...

Fall 2026 Live Online DAT & OAT Prep Course | DAT Destroyer | OAT Destroyer | Dr. Jim Romano Our Fall 2026 Live Online DAT & OAT Prep Course begins September 13, 2026. Prof. Denis Barengolts teaches the live online course, with Dr. Jim Romano joining each class for the first 30–60 minutes for...

onsider Hope, a tortoiseshell cat and a great example of genetics in action. Tortoiseshell coat coloration provides an interesting way to review X-chromosome genetics, mosaicism, and chimerism—concepts worth understanding for DAT and OAT Biology. Free DAT & OAT Resources from Dr. Jim Romano...

Consider Hope, a tortoiseshell cat and a great example of an important genetics concept. Most normal tortoiseshell cats are genetic mosaics caused by random X-chromosome inactivation, not true chimeras. While chimeras involve two separate fused embryos with two distinct DNA sets, standard...

Quick DAT/OAT Biology question from Dr. Jim Romano. Which gene encodes the repressor protein of the lac operon? Understanding gene regulation and the lac operon is important for DAT and OAT Biology. Make sure you understand why the answer is correct rather than simply memorizing it. Free...

Test your knowledge of the lac operon with this DAT/OAT Biology question from Dr. Jim Romano. Which gene encodes the repressor protein of the lac operon? Understanding how the lac operon regulates gene expression—including the roles of the regulatory gene, repressor, and operator—is an...

Endocrine cells are not limited to the major endocrine glands. The stomach also contains enteroendocrine cells that secrete hormones involved in regulating digestion and other physiological processes. Give the problem a try before checking Dr. Romano’s explanation. Understanding the endocrine...

Endocrine cells are not limited to the major endocrine glands. The stomach also contains enteroendocrine cells that secrete hormones involved in regulating digestion and other physiological processes. Give the problem a try before checking Dr. Romano’s explanation. Understanding the endocrine...

Congratulations to one of our Summer 2026 DAT students on an outstanding DAT performance! 🎉 Academic Average: 520 DAT Scores: General Chemistry: 550 Quantitative Reasoning: 530 Reading Comprehension: 530 Survey of Natural Sciences: 510 Organic Chemistry: 490 Biology: 480 Perceptual...

Post 🎉 Congratulations to our Summer 2026 DAT student on an outstanding DAT performance! We are excited to share this student's DAT success story: ⭐ Academic Average: 520 DAT Breakdown: • General Chemistry: 550 • Quantitative Reasoning: 530 • Reading Comprehension: 530 • Survey of...