UNT BIOL 1720 Exam 1 Questions And Answers With Verified Study Solutions

What are the only animals to lack symmetry? - Answer-Sponges What are the 2 types of symmetry? - Answer-radial and bilateral What is radial symmetry? - Answer-symmetry around a central axis (can be any halves on a 2-D plane) think of how you cut a pizza, an example can be a sea anemone. What is bilateral symmetry? - Answer-Right and left halves that are mirror images How do small unicellular organisms take in nutrients? - Answer-diffusion Why is cell size constrained? - Answer-Surface-to-volume ratio. As the cell gets larger, this ratio decreases (not good). This is why larger organisms are multicellular. parazoa? - Answer-(Sponges - the simplest animals) lack definedtissues and organs eumetazoans - Answer-All animals with well defined tissues What are anabolic reactions? - Answer-Reactions that use energy, nutrients are used to fuel this process in animal bodies Basal Metabolic Rate (BMR) - Answer-Average amount of energy used by an organism at rest. What is energy given off as? - Answer-Heat What has a higher BMR rate? Smaller or larger animals? Why? - Answer-Smaller animals, compensates for heat lost from small surface areaWhat has a higher BMR rate? More active or less active animals? - Answer-More active sagittal plane - Answer-(Bilateral) divides the body into right and left midsagittal plane - Answer-(Bilateral) divides the body into EQUAL right and left (think of "mid" as exactly in the middle) frontal plane - Answer-(Bilateral) divides the body into front and back portions (vertical on bipedal animal, horizontal on a quadruped) transverse plane - Answer-(bilateral) divides the animal into upper and lower body portions. (horizontal on bipedal animal, vertical on a quadruped) What if a transverse plane is slanted? - Answer-it is an oblique plane What are the 4 types of animal tissues? - Answer-epithelial, connective, muscle, neurons Epithelial tissue - Answer-lines cavities, open spaces, and surfaces. Rest upon a base. heal well, named based on shape. (ex. small intestine, vaginal wall) What does simple mean? - Answer-1 layer of cells