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Q1. Why do mosses and ferns both require free water to complete their life cycles? At what stage of the life cycle is the water required? Do angiosperms also require water to complete their life cycles? What are reasons for the difference?
Q2. In horses, black coat colour is influenced by the dominant allele (B) and chestnut coat colour by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t). What colour horse would you use to expose the genotype of a black trotter?
Give genotype and phenotype of such horse.
Arrange the amino acid substitutions in increasing order of conservatism and amino acids are given using one letter codes to give you some practice in using those.
Exposure to UV light causes pyrimidine dimer formation. The pyrimidine dimer can be repaired by direct reversal and NER. It can also be bypassed by activation of the SOS response.
Ebola is a far more contagious virus than HIV. However, there has never been a large scale ebola outbreak whereas over 40 million people in the world are currently living with AIDS. What are the characteristics of the ebola virus that hinder its a..
What term is used to describe the expression of alleles when some aspect of both alleles are expressed in a heterozygous offspring.
Why are modern rates of invasion so much higher than pre-historic rates.
Suggest two methods for positively identifying carbon dioxide released in anaerobic respiration?
The Neurospora cross was made between a strain that carried mating type A and the mutant allele arg-1(arg) and another strain the carried mating-type a and the wild type arg-1 (+)gene
Identify the catabolic pathways used by the following bacteria:
What is the inbreeding coefficient for the offspring of a) a full sib mating, b) an uncle/niece mating, c)1st cousing mating? Explain why such close inbreeding in a generally outbred population may lead to decreased fitness.
Some enzymes have a very flat pH profile, i.e. they have nearly the same activity over a very broad pH range. What might this flat pH profile suggest about the amino acids in the active site of the enzyme?
A patient is brought into the ER in a coma. Upon inspection, the physician sees evidence of many new tattoos, as well as yellowing of the skin and eyes. What is the most likely cause of the patient's condition?
Describe how hepatitis C will impact the kidneys. Discuss how cryoglobin, antibodies, blood flow and glomerular filtration are affected. Predict urinalysis results.
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