Question

45) A bacterium engulfed by a white blood cell through phagocytosis will be digested by en mes contained in A) peroxisomes. B) lysosomes. C) Golgi vesicles D) vacuoles. E) secretory vesicles. 44) Which of the following factors would tend to increase membrane fluidity? A) a greater proportion of unsaturated phospholipids B) a greater proportion of saturated phospholipids C) a lower temperature D) a relatively high protein content in the membrane E a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses For questions 45 and 46. The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with Msucrose and 2 Malucose. Initially, the liquid levels on both sides are equal. Sucre Glucose Glype 45) Initially, in terms of tonicity, the solution inside A with respect to that in side B is A) hypotonic. B) plasmolyzed. C) isotonic. D) saturated E) hypertonic. 46) After the system reaches equilibrium, what changes are observed? A) The molarity of sucrose and glucose are equal on both sides. B) The molarity of glucose is higher in side A than in side B. C) The water level is higher in side A than in side B. D) The water level is unchanged. E) The water level is higher in side B than in side A. 47) Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding? A) hormonal signaling B) autocrine signaling C) paracrine signaling D) endocrine signaling E) synaptic signaling

Answer 1

43 (44) (13) Lysosomes : This cell organelle is mainly s cell organelle is mainly containing 50 different types 9 ksydrolytic ewnymes which cam digest protein, lipid, carbohydrates and nucleic acids - All other options which are also cell organell do not have digesting function. (A) A greater proportion of unsaturated phospholipids : will increase I double fluidity membrane since presence of double bonds in the unsaturated phospholipid will have gaps in the tail region, this lower intermolecular attarction leading to increased fluidity. Sateisaled fatte phospholipid and lower temperature decreases membrane fluidity. option (D) and t have no role in membrane fluidity. Side A 2M cuerose 2x 342:29 = 684.789. IM quase = 1* 180:15 2 180 15 9 864.932 Side B 2M glucose , 2x 180'15 - 360-3040 M sur ses * 342:29 2 342 29 702.59 g This initially sich A ï hypertonie to side B. Right option - (E) Hypertonic (D) The water level in unchanged. A8 Since molarity of sucrose as not equal on both sides, so option (A wrong. option (B) in wrong as molarity of glucose will be equal as glucose can pass through the barrier. option (e) & (8) are wrong as water can pass to maintain the level equel - A eolis co Paracrine signaling is a cell-to-cell communication in which signal produced have effect on locally placed a Hormonal & () endocüne signaling have effect on distant (a) tho* o) Autoerine signaling in on same cell. cells.