1. Why is chemical analysis used in forensic science? 2. If you are working as a forensic scientist and are given an unknown powder from a crime
scene, what would you hope to find out about the powder?
3. You find that the unknown powder contains the illegal drug cocaine. If someone were to
ask you to determine the purity of the substance, what would they mean? Why is purity
important in crime investigations?
4. Of the controlled substances, which schedule of drugs is the average person most likely
to have in their homes? How are the controlled substances in this group different from
those in the other schedule levels?
5. What are the dangers of synthetic drugs?

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom