UND Bio 150 Final Exam Completely Solved!

PE1: What is the basic structure of a cell membrane? - ANSWER Phospholipid bilayer with embedded proteins PE1: What is true about hypotheses? - ANSWER A hypothesis can be rejected or supported through experimentation PE1: A solution with a pH of 4 has how many more hydrogen ions than a solution with a pH of 6? - ANSWER 100 times more PE1: Water is able to form hydrogen bonds between water molecules because - ANSWER the oxygen atom in a water molecule is slightly negative while the hydrogen atoms are slightly positive PE1: Living things replicate, grow, and consume energy. A fire can replicate, grow, and it consumes energy. Why is a fire not considered to be alive? - ANSWER Fire is just a set of exergonic chemical reactions that can occur if conditions are suitable. There are no cells, no order, or body. PE1: Altering which structural organization levels of a protein disrupts the function of that protein? - ANSWER Altering any of the levels of organization changes the function of the protein PE1: What best describes a nucleotide? - ANSWER A nitrogenous base, a phosphate group, and a five-carbon sugar PE1: If you gathered all the atoms and molecules that are present in an organism like a mouse and stirred, why wouldn't you ever get the organism? - ANSWER Larger molecules present in living organisms don't form spontaneously without the input of external energy. PE1: Twenty different amino acids are found in the proteins of cells. What distinguishes these molecules? - ANSWER The composition of their side chains, or R-groups. PE1: Which of the following best describes phospholipids? - ANSWER each of these molecules has hydrophobic fatty acids and a hydrophilic phosphate group PE1: What about enzymes is true? - ANSWER Enzymes lower activation energy for the reactions they catalyze