IB Biology Practice Exam Questions with Verified Solutions

IB Biology Practice Exam Questions with Verified Solutions What are the three main parts of the cell theory? What are some possible exceptions? Practice Question 1. All living things are composed of cells. 2. Cells are the smallest unit of life 3. Cells come from pre-existing cells Exceptions: Viruses: living or not? and amoeba What are the basic functions of life? What organisms carry out these functions? Metabolism, response, homeostasis, growth, reproduction and nutrition. Unicellular organisms What are the relative sizes of: 1. Molecules 2. Membranes 3. Viruses 4. Bacteria 5. Organelles 6. Cells 1. 1 nanometer 2. 10 nanometers 3. 100 nanometers 4. 1 um 4. 10 um 5. 100 um What are the formulas for: 1. Magnification 2. Actual size 1. Magnification=measured length/scale bar label 2. Actual size=measured length/magnification Why is important to have a large surface area to volume ratio? Name some places where this happens. Practice Question Practice Question: Alveoli Everything can be exchanged quickly and efficiently when this takes place. Osmosis or diffusion of different products is faster. This takes place in the: intestines, alveoli (the roots are long and branched and they maximize surface area for water uptake, which is good for gas exchange), brain, and kidneys What are emergent properties? Properties that together function as one, but individually don't do much. (organelles in cells) Why are stem cells important, and where can you find them? Practice Question Stem cells are pluripotent and can become anything you want them to be. They are found in the bone marrow, embryo and umbilical cord. They can treat lymphoma. What are the structures and functions of a prokaryotic cell, and what do they look like? (Study the picture) Flagellum: Movement Ribosomes: Protein synthesis Pilli: Attachment, DNA transfer Cell wall: Protective coating, gram-positive or negative Cytoplasm: Contains enzymes for metabolism Nucleoid: Region containing closed-loop DNA Plasma Membrane: Controls entry and exit of substances What is the method of reproduction for prokaryotic cells? Binary fission Is bacteria prokaryotic or eukaryotic? Prokaryotic What are the structures and functions of an animal cell? Be able to draw and label one. REMEMBER! A LIVER cell will have more lysosomes and mitochondria. Practice Question Free ribosomes: make proteins,