Syed Ali Academy

1) The optimum temperature of an enzyme is _______ A) 37 °F    b) 37 °C    c)  45°C    d) 25°C 2) _______enzyme digest proteins A) renin b) pepsin c) trypsin d) both b and c 3) the site where enzyme react with substrate is called __________ A) reactive site b) substrate site c) active site d) none of these 4) key and lock model was given by _______ A) koshland b) fisher c) hackel d) none of these 5) optimum point shows the ________performance of an enzyme A) moderate b) minimum c) maximum 6) at zero temperature the rate of reaction of enzymes is __________ A) slow b) moderate c) faster d) none of these 7) the reactions in which molecules are formed are___________ A) catabolism b) anabolism c) reduction d) a.o.t 8) enzymes are made up of __________molecules A) proteins b) organic  c) inorganic d) a.o.t 9) the substance which decreases the activity of enzyme are called _______ A) activators b) reducer c) inhibitors d) n.o.t 10) Which one is True about Enzymes. A) Fibr

  What is the basic unit of life? A. Atom B. Molecule C. Cell D. Tissue What is the main function of the cell membrane? A. To regulate the exchange of substances between the cell and its environment B. To provide support and shape to the cell C. To store and release energy for the cell D. To control the movement of substances within the cell What is the fluid inside the cell called? A. Cell wall B. Cytoplasm C. Nucleus D. Mitochondria What is the function of ribosomes in a cell? A. To produce energy B. To store genetic material C. To synthesize proteins D. To transport substances across the cell membrane What is the main function of the mitochondria? A. To produce energy B. To store genetic material C. To synthesize proteins D. To transport substances across the cell membrane What is the main function of the endoplasmic reticulum (ER)? A. To produce energy B. To store genetic material C. To synthesize proteins D. To transport substances within the cell What is the main function of the

Q.1 How life cycle of plants show alternation of generation ans: Alternation of generations means that plants alternate between two different life stages, or generations, in their life cycle; a haploid stage called gametophyte and a diploid stage called sporophyte. The terms haploid and diploid refer to the number of chromosomes contained in the cells. When a male gamete (n) joins a female gamete (n) through fertilization, they form a diploid organism (2n) and forms the sporophyte And spores are produced by meiosis which form the gametophyte which is haploid structure Q:2 Why bryophytes are called non vascular plants? Ans They are called non-vascular plants because of the absence of vascular tissues (xylem and phloem) that functions for the conduction of food, water, and minerals. Q.3 how plants cope when invaded from land to sea Plants developed following adaptations to cope from difficulties of land life  A) Waxy cuticles developed to help reduce water loss/desiccation.  B) Roots all