OAT Biology Practice questions with correct answers

All of the following are components of the Cell Theory EXCEPT the idea that a) all living things are composed of cells b) all living things contain mitochondria c) cooperation among cells allows for complex functioning in living things. d) all cells arise from preexisting cells e) cells carry genetic information in the form of DNA - Answer-B A eukaryotic cell contains organelles specialized for various activities. Name the organelles involved and the role they play in the following activities. a) Ingestion b) Digestion c) Transport of proteins - Answer-a) cell membrane, vesicles b) lysozymes, vesciles, and mitochondria c) golgi apparatus, microtubules Which of the following activities occurs in the Golgi apparatus? a) synthesis of proteins b) breakdown of lipids and carbohydrates c) catalysis of various oxidative reactions d) modification and packaging of proteins e) aerobic respiration - Answer-d) modification and packaging of proteins Fluid mosaic model of cell membrane. How does the model account for passage of materials? - Answer-Selectively permeable membrane consists of a phospholipid bilayer with proteins embedded throughout. Lipids and most protein move freely within membrane. Prokaryotes and eukaryotes differ in a number of ways. Compare them in terms of the following characteristics. a) organization of genetic material b) site of cellular respiration c) presence of membrane bound organelles - Answer-a) In prokaryotes, genetic material is a single circular molecule of DNA in the nucleoid. In eukaryotes, highly coiled linear strands of DNA organized into chromosome within a membrane bound nucleus. b) In prokaryotes, cellular respirations happens at the cell membrane. In eukaryotes, respirations happens across the mitochondrial membrane and within the mitochondria itself. c) No membrane-bound organelles in prokaryotes. Eukaryotes have many membrane bound organelles like nucleus, lysosomes, vesicles, ER and mitochondria.