عُشــّٓاقـُــ الـْطــّبــ

transporter moves glucose against its concentration gradient, but ATP is not directly hydrolyzed by that transporter. Na⁺ simultaneously moves down its gradient. What is this? A. Simple diffusion B. Primary active transport C. Secondary active transport D. Osmosis

membrane transporter is exposed to increasing concentrations of its substrate. The transport rate eventually stops increasing despite further increases in substrate concentration. Which explanation is best? A. All membrane lipids have disappeared B. Carrier proteins have become saturated C. Osmosis has stopped permanently D. ATP is never needed in cells

Which statement best describes facilitated diffusion? A. Requires ATP and moves substances against their gradient B. Uses a carrier or channel but does not require metabolic energy C. Moves water only D. Always moves substances from low to high concentration

Why can O₂ cross the plasma membrane without a channel? A. It is positively charged B. It is lipid-soluble and uncharged C. It is transported by ATP D. It binds to a carrier

Which substance can cross the lipid bilayer most easily by simple diffusion? A. Na⁺ B. Glucose C. O₂ D. Protein

Which pressure prevents osmosis? A. Hydrostatic pressure B. Osmotic pressure C. Atmospheric pressure D. Oncotic pressure

During pregnancy, the corpus luteum of pregnancy begins to degenerate approximately at: A. First week B. First month C. Fourth month D. Ninth month

If fertilization occurs, the corpus luteum is maintained initially by: A. FSH B. LH C. hCG D. Estrogen only

The secondary oocyte is arrested in: A. Prophase I B. Metaphase I C. Prophase II D. Metaphase II

Secondary spermatocytes are produced after: A. Meiosis I B. Meiosis II C. Mitosis D. Spermiogenesis

3. 75% of the extracellular fluid in the body is present in: a. Blood plasma b. Intracellular fluid c. Interstitial fluid d. Lymph

. Which polysaccharide contains β-D-fructose as its repeating unit? A) Glycogen B) Starch C) Inulin D) Cellulose ━━━━━━━━━━━━━━━━━━━━ ━━━━━━━━━━━━━━━━━━━━