AP Biology Unit 2 Test Questions with Verified Solutions

AP Biology Unit 2 Test Questions with Verified Solutions _______ is a water channel in bacteria. Aquaporin 2 organelles that contain their own DNA separate from the chromosome Mitochondria and chloroplast A _______ is a chemical released by a cell in one part of the body, that sends out messages that affect cells in other parts of the organism. Hormone Both animals and plants have _________ that allow molecules to pass readily between adjacent cells without crossing plasma membranes. Cell junctions Diffusion through protein channels is known as what? Facilitated diffusion How are hormones transported? In the blood How does the membrane become semipermeable to polar molecules? Protein channels How is temperature measured in the water potential equation? Kelvin If the temperature was 39 degrees C, what is the temperature in Kelvin? 312K Membrane receptors that attache phosphates to specific amino acids in proteins are called Receptor tyrosine-kinases Oxidative organelles Peroxisomes Part of the receptr on the cytoplasmic side serves as an enzyme which catalyses the transfer of phosphate groups from ATP to a certain amino acid on a substrate protein. This is an example of what signal transduction pathway? Tyrosine kinase receptor pathway Reception occurs when a ________ molecule binds to a ______ protein, causing it to change _____. Signal, receptor, shape Ribosomes use the information from the DNA to make what Proteins Signal transduction pathways serve to convert signals on a cell's surface into cellular ________. Responses Site of cellular respiration Mitochondria