SC 135 - Third Exam Fall 2009
Links connect to relevant parts of the online book.
On the line to the left, place the letter of the choice that best answers the question.
1. A karyotype involves
_______ a. Comparing cell shapes b. Counting cell divisions c. Comparing chromosome shapes d. Counting organelles
2. Genetic redundancy applies to
_______ a. Crossing over and substitution mutations b. Enzyme amplification and meiosis II c. Allele amplification and meiosis I
3. In mosaicism, cells have different
_______ a. Parents b. Numbers of nuclei c. Types of projections d. Numbers of chromosomes e. Religions
4. In the lab, our plant cells shrank in the heavy salt solution due to
_______ a. Osmosis into the cells b. Attraction to salt c. Osmosis out of the cells d. Diffusion of salt
5. Much of a cell's RNA is stored in
_______ a. Chromosomes b. Ribosomes c. Endoplasmic reticulum d. Nucleoli e. In little plastic tubs with snap lids
6. Which vesicle would have digestive enzymes in it?
_______ a. Lysosome b. Ribosome c. Digestisome d. Nucleosome e. Tum-tum-osome
7. A zygote is ________ and divides by ________
_______ a. Haploid...meiosis b. Haploid...mitosis c. Diploid...meiosis d. Diploid...mitosis e. A weird goat...splitting
8. There is a much higher concentration of iodine inside thyroid cells than in the fluid around them. Iodine moves into the cells by
_______ a. Cilia b. Active transport c. Osmosis d. Passive transport e. Skateboard
9. Position effects influence how
_______ a. Quickly cells divide b. Easily genes get expressed c. Organelles work together d. All of these
10. The chromosome number of prokaryotes is
_______ a. Always divisible by two b. Always divisible by three c. One d. Not reliable e. Always higher than they want to admit
11. Radiation is most likely to damage cells that are
_______ a. Small b. Big c. Old d. Dividing e. Just being wusses
12. Crossing over typically happens during
_______ a. Interphase b. Meiosis I c. Meiosis II d. Mitosis e. The middle of a moonless night
Answer any eight of the following questions for 4 Points Each.
Answer any four of the following questions for Eight Points Each.
Answer as many as you are able. Wrong answers will not result in points being lost from the main exam. You can get partial credit on these answers.
The ability to produce a particular structure turns a cancer malignant. What structure? Three Points.
Why exactly is an extra chromosome passed to an embryo very dangerous? Three Points.
What sorts of signals can "go bad" and produce cancer cells? Three Points each.
What was the really convincing evidence for the endosymbiont theory? Three Points.
Why does a progressing cancer pretty much have to reactivate its telomerase gene expression? Three Points.
What determines whether an alligator is male or female? Three Points.
HIV escape mutants have to be able to do what two things? Three Points each.
DNA proofreading works best in organisms that fill in below . Three Points.
What disease is probably caused by prions? Three Points.
GENE TRANSLATION TABLE
CODONS ON MESSENGER RNA