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1. If E. coli cells are grown in medium in which lactose is the only available carbon source, which of the following events will occur with respect to the lac operon?A. RNA polymerase will be blocked from binding to the promoter.B. The lac repressor will bind to the operator sequence.C. Three distinct mRNAs will be synthesized, encoding the structural genes (lacZ, lacY, lacA).D. Cyclic AMP (cAMP) concentrations will be low.E. The catabolite activator protein (CAP) will stimulate transcription.2. A mutation occurs in the lac repressor protein such that it can no longer bind to allolactose. What effect will this mutation have on expression of proteins of the lac operon in the presence of lactose?A. It will have no effect since lactose shuts off the operon.B. It will decrease expression of the lac operon proteins.C. It will increase the expression of lac operon proteins.D. It will increase the expression of lac operon proteins, but only when lactose is present.E. It will have no effect since the operon is modulated by the CAP protein
In D. Melanogaster cherub wings(ch), black body (b) and cinnabar eyes (cn) result from recessive alleles tht are all located on chromosome 2. A homozygous wild-type fly was mated with a cherub, black, and cinnabar fly.
We sometimes discover nematodes of unknown species in the digestive tract of bluegill that we dissect. Are these worms parasites or commensals?
Explain the sites and actions of the cardioinhibitory and cardioacceleratory centers and also discuss the factors that affect heart rate and stroke volume.
Suppose brown fur is dominant to blonde fur and these are only possible phenotypes, in a population of mice where 332 are blonde and 826 are brown.
Suppose that plate tectonics and continental drift is in fact occurring, as explained by the convection current hypothesis, what is likely true with regards to relative ages of Atlantic and Pacific oceans?
The concept of vitalism is based on the belief in a life force outside the jurisdiction of physical and chemical laws. According to this belief, organic compounds are able to arise only within living organisms. Which did the most to refute the concep..
What is the difference between orthologs and paralogs and why are only orthologous comparisons useful for determining evolutionary relationships?
Without oxygen, cellular respiration grinds to a standstill, although glycolysis can continue to make some ATP anaerobically for a short time. While oxygen runs out, why does electron transport stop? Why do you thing the Krebs cycle stops.
Explain how penetrance and expressivity can affect the expression of an allele and how epigenetic phenomena affect the observed pattern of inheritance.
Discuss how to figure out a cDNA sequence from an amino acid sequence? This is usually in context of determining an appropriate oligonucleotide probe.
The pH of the inner thylakoid space had been measured, as have the pH of the stroma and the cytosol of a particular plant cell. Why will this cause the pH in the thylakoids to be lesser than the pH in the stroma.
You observe the following numbers of individuals of each genotype in a population, Determine the observed genotype frequencies in this populaiton?
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