Download Session 1 Worksheet

AnS 214 SI Session 1
Wednesday, January 20, 4pm
Random quote of the day:
"I'm not a vegetarian because I love animals, I'm a vegetarian because I hate plants."
A. Whitney Brown
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)
2. Define and give 1 example of positive feedback. Do not use childbirth.
B) Cell Division
1. Match the cell phase to the mitotic event.
Interphase
Nuclear envelope disappears and chromosomes align on equator of
mitotic spindle.
Prophase
Centromeres split and chromatids migrate to opposite sides of cell,
pulled by spindle microtubules.
Metaphase
Chromosome condensation occurs, mitotic spindle forms.
Anaphase
Nuclear compartmentalization separates daughter cells, completing
mitosis.
Telophase
DNA replication occurs, the cell grows by producing proteins and
cytoplasmic organelles.
Cytokinesis
Nuclear envelope begins reforming, chromosomes unwind.
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
C) DNA replication
1. What is the Central Dogma?
2. What mRNA strand would result from this DNA sequence?
TGCATTCAAG
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)
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.