WGU C785 Exam Test Q&A

WGU C785 Exam Test Q&A Assuming 100% reaction efficiency, how many DNA copies are created after the completion of four complete PCR cycles? 16 What is the function of DNA polymerase in the process of PCR? it recognizes the primers and uses the available dNTPs to replicate the template DNA sequence. What are possible blood types of the parents of a patient with blood type AB? A&B Which pair of chromosomes accurately depicts the genotype of a person with an autosomal recessive mutant HBB allele and sickle cell anemia? Which pair of chromosomes accurately depicts the genotype of a person with an X-linked recessive mutant ALAS2 allele and sideroblastic anemia? Oxidative damage to DNA can often result in the alteration of a single nucleotide. Which DNA repair mechanism would repair this type of damage? Base excisin repair Xeroderma pigmentosum (XP) is a recessive genetic disease that occurs when one or more of the genes that perform nucleotide excision repair are nonfunctional. Why do XP patients have a much higher incidence of skin cancer than the general population? The mutation rate of all other genes is higher due to failure to repair. What is the complementary sequence for the following DNA sequence? 5’ – GCC ATC TCG AAT – 3’ 5’ – ATT CGA GAT GGC – 3’ Studies have shown that increased expression of two genes called SIRT1 and SIRT2 is associated with chronic exposure to cocaine and contributes to drug addiction. What difference in the regions of the SIRT1 and SIRT2 genes in people addicted to cocaine increases their expression? The nucleosomes become more widely spaced. Mice with low levels of agouti gene expression tend to have yellow fur and are obese, while mice with higher levels of expression are brown and of normal weight. Studies show that expression of the agouti gene in mice can