Question

37. In the lab cellular processes the dialysis tubing represented what? A. Cell wall B. Capsule C. Nucleus D. Plasma membrane E. Ribosome 38. A scientist is studying an unknown cell under the microscope. She observes that the cell has a nucleus, a cell wall, and a large central vacuole. Based on these observations she can conclude that the cell is most likely A. An archaea B. A bacteria cell C. An animal cell D. A plant cell E. A prokaryotic cell 39. Which cell structure would most likely contain digestive enzymes that are needed to break down engulfed debris? A. lysosome B. nucleus C. centrioles D. nucleolus E.mitochondrion 40. These organelles are sometimes referred to as rough or smooth, depending on their appearance in electron micrographs. A. Golgi bodies B. Ribosomes C. Mitochondria D. Lysosomes E. Endoplamic Reticulum 41. Although it is too simple an explanation, the concept of a key fitting into a lock is descriptive of the A. inhibition of enzymes by small molecules B. fit of coenzymes to enzymes C. matching of enzyme with substrate D. regeneration of ATP from ADP Estepwise cascade of electrons in the oxidation-reduction reactions ? 42. The Cofactor for cathecholase is A. Iron B. Magnesium C. Copper D. Oxygen 43. When an enzyme becomes denatured, it B. Loses its requirement for a cofactor C. Increases its effectiveness D. Loses its ability to function 44. All of the following are terms applicable to a cell placed in a hypertonic solution EXCEPT A. Wilting

Answer 1

37. Dialysis is the separation of smaller molecules from larger molecules in solution by selective diffusion through a semipermeable membrane. Dialysis tubing will be used in this laboratory to simulate a cell membrane. It is made of selectively permeable cellulose tubing perforated with microscopic pores.

38. Animal cell

39. Lysomes are called autophagosome which cotains many hydrolytic enzymes to digest the engulfed materials .

40. Endoplasmic reticulum . According to presence of ribosome ER is divided into two types Smooth endoplasmic reticulum ( SER ) and Rough endoplasmic reticulum ( RER ) .

41. The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy first postulated in 1894 by Emil Fischer. In this analogy, the lock is the enzyme and the key is the substrate. Only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme).

42. The co factor of Cathecholase is oxygen . It helps to give brown color to the cut fruits or vegetables.

43. Higher temperatures disrupt the shape of the active site, which will reduce its activity, or prevent it from working. The enzyme will have been denatured . The enzyme, including its active site, will change shape and the substrate no longer fit. The rate of reaction will be affected, or the reaction will stop.

44. Turgid

45. All of the above.

46. Plasmolyzed

47.Coccus

48. The cell will burst . As the concentration gradient is higher in the out side the the water moves in the direction from the outside to inside of the cell.

49.Active transport requires energy.

50. The source of catecholase is catechol