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Questions:
1. SSB proteins bind to single-stranded DNA at the replication fork and prevent the formation of short hairpin helices thatwould otherwise impede DNA synthesis. What sorts of sequences in single-stranded DNA might be able to form ahairpin helix? Write out an example of a sequence that could form a 5-nucleotide hairpin helix, and show the helix.
2. One remarkable feature of the genetic code is that amino acids with similar chemical properties often have similar codons.Codons with U or C as the second nucleotide, for example, tend to specify hydrophobic amino acids. Can you suggest apossible explanation for this phenomenon in terms of the early evolution of the protein synthesis machinery?
3. (True/False) When read in the same direction (5' to 3'), the sequence of nucleotides in a newly synthesized DNA strand isthe same as in the parental template strand. Explain your answer.
In cats, the X-linked allele O converts the black pigment found in the fur into an orange pigment. Heterozygous females are mosaics of orange and black pigmented fur.
A woman with keratosis, a skin condition caused by a rare dominant allele, marries a normal man, and they have two children. What is the probability that both children are normal?
What is the definition of a salvage pathway and a de novo pathway for biosynthesis? Show the salvage enzymes for both the purines and pyrimidines.
The correct folding of proteins is necessary to maintain healthy cells and tissues. Unfolded proteins are responsible for such neurodegenerative disorders as Alzheimer's, Huntington's, and Creutzfeld-Jacob disease.
A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 35 ears in 1/1000 of an acre. He determines that each ear has about 500 kernels on average. He also knows that a bushel contains about 97,..
Assume blood isolated from an emergency room patient contains antibodies against the measles virus. Describe whether or not the patient should be quarantined immediately because they are infected with the measles virus.
The main organs and structures labeled.
methods for assayingdetecting viruseswrite a paragraph to teach to the rest of the class one of the following
What effects would this have on the cold-blooded creature's metabolism? Would you expect the same changes to occur in a warm-blooded creature?
What are the legal and ethical issues that patients, health care providers, and the society face
q. do all the probable monohybrid crosses for the abo blood group and give the genotype and phenotype ratios following
You are a neurologist and perform a patellar reflex on each side of the body in one of your patients. You notice that the left side reflex doesn't work. The patient can feel a gentle sweeping motion on the thigh in both legs, cannot voluntarily..
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