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Cells proofread and repair errors in the genetic information encoded in DNA. But lasting mistakes, or mutations, can happen. The most error-prone stage in DNA replication occurs after parent DNA strands have separated but before new complementary strands are in place.
Why might permanent errors be more likely then?
A corporation has invented a new low-calorie sugar substitute. They wish to determine if the substitute might be carcinogenic, so they use it in the Ames test with Salmonella his mutants.
Bone marrow contains at least three populations of stem cells. How do you isolate HSCs from human bone marrow separately from the other two then and discuss the structural and functional changes of Ichemic stroke.
A pH profile shows that the pH optimum for an enzyme is from pH5 to pH9. Assuming that the pKas for the side chains of the amino acids are unaltered from their normal values,
A cricket has a diploid genome of 1.2 billion base pairs. Assume that there are about 200,000 individuals in the population and that the mutation rate is one per 100 million base pairs. About how many new mutations will occur in each generation of..
Glycogen is a polymer, so it has more energy than an equivalent number of glucose molecules. How does the cell find the energy necessary to make this storage product?
Does the volume of air passing in and out of the resting subject's lungs each minute increase or reduce due to exercise? If so, was the change due to an increase in the rate of breathing,
two people with heterozygous type B blood marry and procreate. If they are also heterozygous for the Rh factor, what are the genotypes and phenotypes of the children they could have. prove with punnett square.
The nucleotide composition of a virus is 10 percent Adenine, 15 percent Thymine, 45 percent Cytosine, and 30% Guanine. Can you predict that the DNA has the double helical structure?
Consider the use of the Punnett square or your knowledge of meiosis. Explain how the evidence DNA profile and knowing the DNA profile of an offspring can lead to a parent as a suspect. Discuss difference between a genotype and a phenotype.
Poly U, an artificial mRNA, was added to a test tube with all other components for protein synthesis ("Complete system"). Other test tubes differed from the complete system as indicated in the table.
When yellow mice are crossed with albinos, they produce F1 mice consisting of ½ albinos, ? yellow and 1/6 agouti. What are the possible genotypes of the parents.
Compare and contrast aerobic respiration, anaerobic respiration, and fermentation and how do antibiotics work? Why do they kill pathogens without harming us?
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