Question

)CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they Il at night I and B) fis COz inho organic acids during the C) fix COg into pyruvate is the D) ix Coz into sugars i E) use the enayme ien the bundle-sheath cels whicdh outcompetes rubisco for CO 13) in yeast signal transduction, the yeast A) peoduce signal molecules that interact with one another 1 e signal molecules that change themselves so they can interact molecules that diffuse to other yeast cells rete molecules that result in response by other yeast cells C) secrete molecules Dy mate after which the new cells secrete hybrid signals A) The cell dies, it is lysed, its oerganelles are phagocytized, and its comtents are recycled. B) Its nucleus and organelles are lysed, then the cell enlarges and bursts 14) Whicth of the fellowing describes the events of apoptosis? C) Its DNA and organelles become tragmented, in dies, and it is phagocytined D) Its DINA and organelles are fragmented, the cell shrinks and forms biebs, and the cell self-digests cell dies and the presence of its fragmented contents stimulates nearby cells to divide. E) The ry iroelis in the preess of dividing are subjected to colchicine, a drug that interferes with the formation of the spindle apparatus, at which stage will mitosis be arrested? A) telophase B) metaphase C) interphase E) anaphase 16) Which of the following describets) cyclin-dependent kinase (Cdk)? B) Cdk is present throughout the cell cycle and is an enzyme that attaches phosphate groups to other proteins E) Cdk is an enzyme that attaches phosphate groups to other proteins. 17) Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all sexual life cycles have in common? I. Alternation of generations II. Meiosis III. Fertilization IV. Gametes V. Spores A) IL, IV, and V B) IL, IlI, and IV C)L, II, and IV D) L IV, and V E)l,II, Ill, IV, and V

Answer 1

12)B

• Full form of CAM is Crassulacean acid metabolism

13)C

• Transduction is a process of introducing foreign DNA into the cell by a virus or viral vector

14)D

• Apoptosis is a form of programmed cell death

15)B

• Colchicin is an alkaloid which is poisonous

16)B

• Cdk helps in regulating cell cycle.

17)B