Bio 103 Practice Questions with Correct Answers

Endosymbiosis a mutually beneficial relationship in which one organism lives within another advantages of multicellularity 1. Organization of many cells into a single mass reduces SA to V ratio 2. Permits subdivision of labor amongst different tissues (specialization) origins of multicellularity 1. Intercellular connections (loss of cell wall in animal cells creates vulnerability) 2. cellular specialization 3. Communication (division of labor of cells means they must work together) 4. Evolution of diversity brown fat a dark-colored adipose tissue with many blood vessels, involved in the rapid production of heat in hibernating animals and human babies- contains lots of mitochondria Acclimation an organism's change in response to a change in the organism's environment acclimatization Adjusting to a new range of environmental temperatures. Conformers allow internal conditions to change with external conditions Regulators maintain relatively constant internal conditions regardless of external conditions Allostasis process by which the body achieves stability through physiological change Elements of Endocrine Signalling 1. Synthesis (hormone is synthesized in an endocrine gland) 2. Secretion (somehow escapes from the tissue) 3. Transport ( travels to target tissue) 4. Reception (binds a receptor at the target tissue) 5. Transduction (connects receptor to effector) 6. Response Myocytes what make up muscle tissue