spring question.png A 2.50 kg mass is sliding along a rough  level, surface of coefficient of kinetic friction of 0.350 between the mass and the surface, when it encounters a spring of spring of spring constant 125 N/m.  If the mass is traveling at 1.20 m/s when it contacts the spring determine by how much the spring compresses in stopping the mass.

A 0.60 kg plate falls straight down from a table and breaks into 3 pieces.  A 0.20 kg piece travels North at 5.0 m/s.  A 0.15 kg piece travels at 6.0 m/s in a direction of 30.00 North of East.  What is the speed of the third piece?

Assign the chirality center. ©GMU_349972_1    

Consider the following figure: Mutations in genes that encode some of the proteins illustrated in this figure

Select True or False for each statement below. 1) Both PCR and droplet digital PCR (ddPCR) use a droplet generator. [Fasle1] 2) ddPCR involves partitioning the sample so that PCR is done on a single DNA molecule (on average) whereas PCR uses a sample with many DNA molecules. [True2] 3) ddPCR uses primers and PCR does not use primers. [False2]

Fill in the blanks with the best answer from the dropdown menu. Use each item from the dropdown menu only once.     In the immune system, the complement cascade tags [pathogens] for [phagocytosis] by [immunecells]. In the brain, the complement system tags [synapses] for [pruning] by [microglia].

Fill in the blanks with the best answer from the dropdown menu.    In GWAS, [SNPallelefrequency] is compared between a control group and an experimental group. A p-value is calculated for each comparison. For each comparison, this p-value tells you the probability that the difference observed between the groups is due to [chance]. 

The same haplotype block on six different homologous chromosomes from the population is shown below. The five SNPs in this block are genotyped on each chromosome; the rest of the DNA sequence (…..) is identical between the chromosomes.   1) How many different haplotypes can you see? [number] 2) Which combination of SNPs could be used as TAG-SNPs to identify the haplotype found in in this haplotype block? [TAGSNPS]

What is the genetic variation in the Huntingtin gene that effects disease risk and disease severity in Huntington’s disease?

Which characteristic distinguishes Huntington’s Disease from other diseases?