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Eliminate the parameter to find a Cartesian equation for the curve x = -1+3sec(t) and y = 2+3tan(t)
Give an example of phenotypic plasticity that might be triggered by an environmental cue.
What is the evidence that chordin, follistatin and noggin have overlapping, partially redundant roles in the process of neural induction
What germ layer is present in triploblasts but is absent in diploblasts
Explain the observation that segment polarity genes code for many different types of proteins while gap genes and pair-rule genes code only for one class of protein.
You would like to identify an enzyme that could potentially be used in a biosensor to detect explosives. Describe a strategy by which you would find a new microbial enzyme that is active towards the
In a randomly mating laboratory population of Drosophila, 9% of the flies have black bodies (encoded by the autosomal recessive ebonygene) rather than the wild-type tan colour. What proportion of th
Define the following concepts: a)allopatric speciation b) clade
A complex set of different specialized adaptations is needed for a bat to catch insects efficiently using ultrasound echolocation. Offer a brief general argument that such a "perfect" system could n
Briefly describe a piece of evidence supporting the theory that genome evolution involves the rearrangement of existing genes.
In a Northeastern U.S. forest, tiger salamanders were abundant. These salamanders need the humidity of the forest to survive and have a short dispersal distance when they leave the forest (less than
You go through four evolutionary mechanisms and discuss whether each is likely or unlikely to account for the change in allele frequencies: mutation, gene flow (migration), genetic drift, and natura
Ground finches feed on seeds from different sizes, in different islands from the Galapagos Archipelago. The populations have beaks of different sizes. Finches with small beaks eat small seeds, finch
Hypothetical deer population: Females prefer bigger males to mate. Thus, big males have more offspring than intermediate males. Intermediate-sized males have more offspring than small males. Small
Historically, soapberry bugs fed on seeds from fruits of native fruits in Florida. Their beak is long enough to pass through the pulp and reach the seed. Native trees (and their fruits) in Florida b
Red flowered male plants were crossed to white flowered female plants. The progeny from this cross were examined and it was found that there were only white-flowered male plants and red-flowered fem
DNA sequences can also be used for phylogenetic analysis, but this approach relies on the growth and cultivation of microorganisms in the lab and knowledge of specific gene products and sequences.
A mutagenesis screen was conducted to identify plants that were unable to sustain green leaves under high intensity lighting. In the M2 generation three mutants were identified.
In constructing the molecular phylogeny, researchers extracted DNA from Vibrio cholerae and then compared housekeeping gene sequence homology in order to characterize the sample strains.
Prokaryotic and eukaryotic cells are distinguishable by many features, including their genomes. You have been provided with samples of total DNA from prokaryotic and eukaryotic cells.
How can horizontal gene transfer be exploited in molecular biology?Please give full description about gene.
What is the product of the psbC gene? What is its function? In the PCR reaction, what is the role of each of the PCR reagents: primers, dNTPs, Mg2+, and Taq polymerase?
Distinguish among covalent bonds, ionic bonds, hydrogen bonds and hydrophobic interactions.
Scientists are taught to follow the scientific method. In doing so, they should be assured that there is no bias in their science. However, is this always the case?