<p> AnS 214 SI Session 1 Monday, September 31, 7pm A) Feedback 1. Define negative feedback, and present an example illustrating the concept (ex: rising body temp causes blanketyblank, resulting in a lowered temp; lowered temp activates blanketyblank to increase body temp)</p><p>2. Define and give 1 example of positive feedback. Do not use childbirth.</p><p>B) Cell Division 1. Match the cell phase to the mitotic event.</p><p>Interphase Nuclear envelope disappears and chromosomes align on equator of mitotic spindle.</p><p>Prophase Centromeres split and chromatids migrate to opposite sides of cell, pulled by spindle microtubules.</p><p>Metaphase Chromosome condensation occurs, mitotic spindle forms. </p><p>Anaphase Nuclear compartmentalization separates daughter cells, completing mitosis. </p><p>Telophase DNA replication occurs, the cell grows by producing proteins and cytoplasmic organelles.</p><p>Cytokinesis Nuclear envelope begins reforming, chromosomes unwind.</p><p>2. The result of mitosis is ___ cell(s) is/are ______to each other. a) 2; genetically disparate but genetically identical b) 4; physically and genetically identical c) 2; physically and genetically identical d) 2; genetically identical but physically disparate e) 4; genetically identical but physically disparate</p><p>C) DNA replication 1. What is the Central Dogma?</p><p>2. What mRNA strand would result from this DNA sequence? TGCATTCAAG</p><p>3. A DNA molecule is composed of 18% adenine and 32% guanine. What is its % composition of thymine and cytosine? 4. A strand of DNA codes for a protein that is comprised of 27 amino acids. What is the minimum number of nucleotides that is found on the mRNA molecule transcribed from this strand? (do not count start and stop codons)</p><p>5. Johny is a smurf. A smurf obtains his/her unique aquamarine coloration through a recessive genetic mutation found on the X chromosome (X'). Fill in the genetic tree below, explain to Johny the genetic basis for the daily barrage of wedgies and wet-willies he receives from his non-smurf classmates. </p>