3. If the pH of a solution decreases from 7 to 4, it means the concentration of hydrogen ions (H⁺) has:
(A) decreased by a factor of 3.
(B) decreased by a factor of 1000.
(C) increased by a factor of 3.
(D) increased by a factor of 1000.

49.依據格林(Green)提出的 PRECEDE-PROCEDE 模式，欲評估影響學生安全性行為的素質因素(predisposing factors)，應收集下列何者？ (A)學生的性態度與價值觀 (B)學生取得保險套的方便程度 (C)學校護理師對學生避孕方式的指導 (D)同儕對安全性行為的態度與行為

50.依學校衛生法第 8 條及學校衛生法施行細則第 6 條，學校應建立學生健康管理制度，但不包括下列何種事項？(A)定期辦理學生健康檢查(B)特殊疾病學生醫療轉介及個案管理(C)發動捐款，募集社會資源，辦理校園健康促進活動。(D)輔導學生進入特殊班、特殊學校就讀，或進入教養機構接受照護。

1. Which of the following describes the difference between two isotopes of the same element?(A) They have a different atomic number.(B) They have one more proton.(C) They have one more electron.(D) They have a different number of neutrons.

2. The property of water that allows hydrogen bonds to form between water molecules is primarily due to:(A) water's overall nonpolar nature.(B) the equal sharing of electrons between oxygen and hydrogen.(C) the polar covalent bonds between oxygen and hydrogen atoms.(D) water being a good solvent for hydrophobic substances.

4. Which of the following is defined as the study of carbon compounds?(A) Biochemistry (B) Organic chemistry(C) Physical chemistry (D) Inorganic chemistry

5. A single polypeptide chain can have all of the following levels of structure EXCEPT:(A) Primary structure (B) Secondary structure (C) Tertiary structure (D) Quaternary structure

6. Which of the following is present in a prokaryotic cell?(A) Mitochondrion (B) Ribosome (C) Nuclear envelope (D) Chloroplast

7. For a resting neuron, which of the following is true regarding ion distribution and membrane potential?(A) The concentration of Na+ is higher inside the cell, and the membrane potential is positive.(B) The concentration of K+ is higher outside the cell, and the membrane potential is positive.(C) The concentration of Na+ is higher outside the cell, and the inside is negatively charged relative to the outside.(D) The concentration of K+ is higher outside the cell, and the inside is positively charged relative to the outside.

8. Which of the following classes of large biological molecules does NOT consist of polymers?(A) Carbohydrates (B) Proteins (C) Lipids (D) Nucleic acids

9. Which of the following processes involves the net movement of water across a selectively permeable membrane?(A) Active transport (B) Facilitated diffusion (C) Osmosis (D) Cotransport