Daily Practice Questions

6 questions across multiple subjects, with detailed explanations and study tips.

📝 Questions

🧬 AP Biology Medium
What is the role of oxygen in cellular respiration?
  1. A. to combine with carbon and electrons to form carbon dioxide
  2. B. to combine with protons and electrons to form water ✓
  3. C. to remove carbon from glucose to form pyruvate
  4. D. to remove carbon from pyruvate to form alcohol
Explanation: Oxygen acts as the final electron acceptor in the electron transport chain, where it combines with hydrogen ions (protons) and high-energy electrons to synthesize water. This process is essential because it allows the cell to maintain a continuous flow of electrons, enabling the production of a large amount of ATP through oxidative phosphorylation. In contrast, carbon dioxide is produced when carbon atoms are removed from glucose during earlier stages like the Krebs cycle, not by combining with oxygen.
📝 ACT Prep Hard
I watched in dismay as my laptop was crushed beneath the taxis wheels'.
  1. A. NO CHANGE
  2. B. taxis' wheels.
  3. C. taxi's wheels'.
  4. D. taxi's wheels. ✓
Explanation: The changes in the answer choices identify apostrophes as the topic. Use POE heavily with apostrophes: eliminate all the answers that are wrong. If you just try to fix it in your head and find a match, you'll likely miss something. Wheels don't "possess" anything in this sentence, so eliminate (F) and (H). The wheels belong to the taxi, so an apostrophe is needed on that word. Eliminate (F), and (J) is the correct answer.
🧪 AP Chemistry Medium
Which of the following is the correct net ionic equation for the reaction of acetic acid with potassium hydroxide?
  1. A. HC _{2} H _{3} O _{2} (aq) + OH ^{–} (aq) → C _{2} H _{3} O _{2} ^{–} (aq) + H _{2} O(l) ✓
  2. B. HC _{2} H _{3} O _{2} (aq) + K ^{+} (aq) → KC _{2} H _{3} O _{2} (aq) + H ^{+} (l)
  3. C. HC _{2} H _{3} O _{2} (aq) + KOH(aq) → KC _{2} H _{3} O _{2} (s) + H _{2} O(l)
  4. D. H ^{+} (aq) + OH ^{–} (aq) → H _{2} O(l)
Explanation: A — Acetic acid is a weak acid; as such, it should be written as HC _{2} H _{3} O _{2} . Potassium hydroxide is a strong base, so it will separate into K ^{+} and OH ^{–} ions. Any potassium compound that might form is soluble and will yield K ^{+} ions. The potassium ions are spectator ions and are left out of the net ionic equation.
📊 SAT Math Easy
Which choice completes the text so that it conforms to the conventions of Standard English? Both Truman and MacArthur were American leaders in the late 1940s and early 1950s in the aftermath of the Allied victory during World War II. Naturally, only one of them could emerge victorious from the rubble of _______ power struggle.
  1. A. classes
  2. B. class’es
  3. C. class’s ✓
  4. D. classes’
Explanation: The phrase "rubble of power struggle" requires the singular noun "class" to be modified by a possessive apostrophe to indicate that the struggle belongs to a single class. Since "class" is singular, the possessive form is created by adding an apostrophe and an "s" (class's). Choice (D) uses the plural possessive for multiple classes, while choices (A) and (B) are grammatically incorrect in this context.
🎯 GMAT Prep Hard
If the perimeter of right triangle ABC above is , what is the area of the triangle?
  1. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  2. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. ✓
  3. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  4. D. EACH statement ALONE is sufficient.
  5. E. Statements (1) and (2) TOGETHER are not sufficient.
Explanation: Statement (2) provides the length of one leg and confirms it is equal to the other leg, identifying the triangle as an isosceles right triangle; combined with the given perimeter, this allows you to solve for the side lengths and calculate the area. Statement (1) only gives the hypotenuse length, which is insufficient because there are infinitely many right triangles with that specific hypotenuse having different perimeters and areas. Therefore, only Statement (2) alone provides enough information to determine a unique solution.
✍️ AP English Language Medium
The writer wants to rephrase the beginning of sentence 11 (reproduced below), adjusting the capitalization as needed, for the purpose of more fully explaining the relevance of ideas expressed in sentences 9 and 10.
  1. A. (keep it as it is)
  2. B. Of sociological interest to researchers is generally
  3. C. This structure allows sociologists to study the dynamics of ✓
  4. D. Since power in this structure is unevenly divided, sociological researchers study
  5. E. As a consequence of this configuration,
Explanation: is the best answer because it provides clarity and coherence to a series of diverse ideas regarding the main subject of the passage.

💡 Study Tips

🎯 Eliminate before you guess

On multiple-choice questions, crossing out answers you know are wrong before guessing dramatically improves your odds. Even eliminating one option on a four-choice question raises your chance from 25% to about 33%.

📖 Space out your study sessions

Studying the same topic across multiple shorter sessions over several days leads to stronger long-term retention than cramming everything into one marathon session. Try 25-minute focused blocks with 5-minute breaks.

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