BSC 108 Exam 1-ALABAMA Study guide

Domain Eukarya contains animals, plants, protists, and fungi. - True The process of keeping internal conditions constant is known as - Homeostasis The levels of biological organization, in order from least complex to most complex, are: biosphere, ecosystems, communities, populations, organisms, organ systems, organs, tissues, cells, atoms, molecules. - False A new species has been discovered. Individuals of this species are multicellular eukaryotes that obtain nutrients from decomposing organic matter. In which domain should this species be classified? - domain Eukarya Communities are more complex than populations. - true What is the lowest level of structure that can perform all activities required for life? - cells A tentative explanation of an observation is - hypothesis A collection of hypotheses that have been repeatedly tested without rejection is called a - theory The three domains of life are: - Eukarya, Archaea, Bacteria What is the difference between hypothesis and theory? - A theory is much broader in scope than a hypothesis and is generally supported by an accumulation of extensive and varied evidence. Describe one theory that unifies biology as a science. - The theory of evolution by natural selection unifies biology as a science because it accounts for the unity and diversity of life on Earth. This theory states that there is an overproduction of offspring and competition for resources, and variation exists among individual offspring. Unequal reproductive success (natural selection) among these offspring is the mechanism of evolution. What are the steps used in the scientific method? Use an example to illustrate the steps of the scientific method. - a)Observations, Question, Hypothesis, Prediction, Test, Revise hypothesis or Make additional predictions and test them. Example: I observe that my flashlight does not work. I question whether the batteries are dead. I hypothesize that the dead batteries are causing my flashlight to not work properly. I predict that changing the batteries will cause the flashlight to work again. I test my prediction by replacing the batteries with new ones. If the flashlight works, my hypothesis was correct. If not, perhaps make a new hypothesis that the light bulb is dead and need replacement. What is the function of nucleic acids? - To store and transmit hereditary information. Which of the following macromolecules function in energy storage? - carbohydrates Which subatomic particle has a negative charge? - electron Which of the following is NOT a component of an atom? - positron Which of the following is a single-stranded nucleic acid? - RNA An element is found to contain 33 electrons, 33 protons, and 22 neutrons. Which of the following is true? - Its atomic number is 33 and its atomic mass is 55. Steroids belong to which class of macromolecules? - lipids Which of the following best summarizes the relationship between dehydration reactions and hydrolysis? - Dehydration reactions assemble polymers and hydrolysis breaks down polymers. Oxygen forms two ______________ bonds with hydrogen atoms to form a water molecule. - polar covalent