Biology and Genetics

You are studying directional selection on neck length in two giraffe populations

You are studying directional selection on neck length in two giraffe populations. Below you can see data on neck length of the whole population and breeding parents for each popul…

You are studying disease X, a genetic disorder that arises from a trinucleotide

You are studying disease X, a genetic disorder that arises from a trinucleotide repeat expansion mutation which is a mutation where entire codons are multiplied during the replica…

You are studying ear length in rabbits. There are two phenotypes, long and short

You are studying ear length in rabbits. There are two phenotypes, long and short ears, which are controlled by the E and e alleles, respectively. Long ears are dominant over short…

You are studying epigenetic regulation of the Bdnf gene in mice and its associat

You are studying epigenetic regulation of the Bdnf gene in mice and its association with memory. You train mouse B to avoid an adverse stimulus and then isolate genomic DNA from i…

You are studying epigenetic regulation of the Bdnf gene in mice and its associat

You are studying epigenetic regulation of the Bdnf gene in mice and its association with memory. You train mouse B to avoid an adverse stimulus and then isolate genomic DNA from i…

You are studying four recessive alleles in hawks. They are blunt talons (t), sma

You are studying four recessive alleles in hawks. They are blunt talons (t), small wings (s), featherless (f), and short beak (b). The wild type counterparts of these genes are re…

You are studying fox snakes in your laboratory and you notice that in your colon

You are studying fox snakes in your laboratory and you notice that in your colony some have dark spots on their back, whereas others do not have those dark spots. From this, you d…

You are studying fruit flies that have a metabolic disorder. An enzyme assay is

You are studying fruit flies that have a metabolic disorder. An enzyme assay is available to determine the level of the enzyme in tested flies. Flies that are EE are scored as 1.0…

You are studying heart development in Drosophila and get two animals from a true

You are studying heart development in Drosophila and get two animals from a true-breeding line from a collaborator with a faulty valve. Your collaborator has found that the faulty…

You are studying how a certain species of grass decomposes in a semi-arid grassl

You are studying how a certain species of grass decomposes in a semi-arid grassland in southern Arizona to get an idea on the C dynamics of the region. You find that after a few m…

You are studying how a certain species of grass decomposes in a semi-arid grassl

You are studying how a certain species of grass decomposes in a semi-arid grassland in southern Arizona to get an idea on the C dynamics of the region. You find that after a few m…

You are studying how energy flows in a food web. The data in Table 1 shows the d

You are studying how energy flows in a food web. The data in Table 1 shows the dietary composition of species in your study area (for species A–H). To read the data table, start a…

You are studying how energy flows in a food web. The data in Table 1 shows the d

You are studying how energy flows in a food web. The data in Table 1 shows the dietary composition of species in your study area (for species A–H). To read the data table, start a…

You are studying how energy flows in a food web. The data in Table 1 shows the d

You are studying how energy flows in a food web. The data in Table 1 shows the dietary composition of species in your study area (for species A–H). To read the data table, start a…

You are studying lactose metabolism and have been culturing E. coli in different

You are studying lactose metabolism and have been culturing E. coliin different medias. One media has only glucose, one has only lactose, and a third has both glucose and lactose.…

You are studying mitosis in cultured cells. These are transformed (cancerous) an

You are studying mitosis in cultured cells. These are transformed (cancerous) and as a result bypass the metaphase/anaphase checkpoint. You have one cell line that has a loss of f…

You are studying nuclear protein import in human cells. To test the requirement

You are studying nuclear protein import in human cells. To test the requirement for the Ran protein, you have set up an in vitro nuclear import assay. In this essay, human tissus …

You are studying nuclear protein import in human cells. To test the requirement

You are studying nuclear protein import in human cells. To test the requirement for the Ran protein, you have set up an in vitro nuclear import assay. In this essay, human tissus …

You are studying nuclear protein import in human cells. To test the requirements

You are studying nuclear protein import in human cells. To test the requirements for the Ran protein, you have set up an in vitro nuclear import assay. In this assay, human tissue…

You are studying nuclear protein import in human cells. To test the requirements

You are studying nuclear protein import in human cells. To test the requirements for the Ran protein, you have set up an in vitro nuclear import assay. In this assay, human tissue…

You are studying nuclear protein import in human cells. To test the requirements

You are studying nuclear protein import in human cells. To test the requirements for the Ran protein, you have set up an in vitro nuclear import assay. In this assay, human tissue…

You are studying nuclear protein import in human cells. To test the requirements

You are studying nuclear protein import in human cells. To test the requirements for the Ran protein, you have set up an in vitro nuclear import assay. In this assay, human tissue…

You are studying one of the last remaining populations of an endangered bird. Th

You are studying one of the last remaining populations of an endangered bird. This bird reproduces each spring. Each summer     you tag all new fledglings and look for older marke…

You are studying populations of a certain species of frog intwo ponds 5 kilomete

You are studying populations of a certain species of frog intwo ponds 5 kilometers apart. There are no other ponds in the area.In pond A all the frogs are small and have a few bla…

You are studying selection on a trait in a wild population and you do not know t

You are studying selection on a trait in a wild population and you do not know the heritability of the trait, but are able to measure it in a large sample of the population. You t…

You are studying several alleles of an E. coli helicase gene. One allele, called

You are studying several alleles of an E. coli helicase gene. One allele, called rs, confers resistance to RS2014, an antibiotic that works by inhibiting helicase activity. Bacter…

You are studying several alleles of an E. coli helicase gene. One alles, called

You are studying several alleles of an E. coli helicase gene. One alles, called rs^R, conifers resistance to RS2014, an anitbiotic that works by inhibiting helicase activity. Bact…

You are studying sexual reproduction with an organism thatcontains 2 pairs of ho

You are studying sexual reproduction with an organism thatcontains 2 pairs of homologouschromosomes.    a. Please choose 2 sets of traits to follow during meiosis. 2traits should …

You are studying some Martian cells with similar chromatin and DNA to life found

You are studying some Martian cells with similar chromatin and DNA to life found on Earth. You set up a "Mars growth chamber" to grow your cells at 10 degrees C (they like it cold…

You are studying state of equilibrium by investigating the reaction of the iron

You are studying state of equilibrium by investigating the reaction of the iron (III) ion with the thiocyanate ion (SCN-). These two ions come together in an association reaction …

You are studying synaptic transmission and discover a treatment that reduces the

You are studying synaptic transmission and discover a treatment that reduces the proportion of failures at your synapse (the fraction of presynaptic action potentials that do not …

You are studying the EGFR signaling pathway in a tumor cell line isolated from a

You are studying the EGFR signaling pathway in a tumor cell line isolated from a melanoma. These cells have uncontrolled proliferation. They continue to grow in the absence of EGF…

You are studying the ability of your cultured cells to increase Ca == intracellu

You are studying the ability of your cultured cells to increase Ca== intracellularly in response to a newly identified agent you have extracted from a soil fungus during a pharmac…

You are studying the ability of your cultured cells to increase Ca == intracellu

You are studying the ability of your cultured cells to increase Ca==intracellularly in response to a newly identified agent you have extracted from a soil fungus during a pharmace…

You are studying the binding of proteins to the cytoplasmic face of a cultured n

You are studying the binding of proteins to the cytoplasmic face of a cultured neuroblastoma cells and have found a method to create small liposomes containing lipids and proteins…

You are studying the binding of proteins to the cytoplasmic face of a cultured n

You are studying the binding of proteins to the cytoplasmic face of a cultured neuroblastoma cells and have found a method to create small liposomes containing lipids and proteins…

You are studying the binding of proteins to the cytoplasmic face of a cultured n

You are studying the binding of proteins to the cytoplasmic face of a cultured neuroblastoma cells and have found a method to create small liposomes containing lipids and proteins…

You are studying the binding of proteins to the cytoplasmic face of cultured neu

You are studying the binding of proteins to the cytoplasmic face of cultured neuroblastoma cells and have found a method that gives a good yield of inside-out vesicles from the pl…

You are studying the biochemistry of DNA polymerases in the bacterium X. coli. Y

You are studying the biochemistry of DNA polymerases in the bacterium X. coli. You have discovered 3 distinct DNA polymerase activities D, F and G that you analyze in vitro. For t…

You are studying the biosynthesis of Compound X in a deep sea microorganism. You

You are studying the biosynthesis of Compound X in a deep sea microorganism. You isolated five different strains of autotrophs that cannot synthesize Compound X on minimal media a…

You are studying the calnexin protein, To study the calnexin protein more, you d

You are studying the calnexin protein, To study the calnexin protein more, you decide to mutate the amino acids KKRR found on the C-terminal end in calnexin to amino acids AAAA, t…

You are studying the effect of directional selection on body height in three pop

You are studying the effect of directional selection on body height in three populations (a, b, and c). (a) What is the selection differential? Show your calculation. (b) Which po…

You are studying the effects of amino acid replacements on the stability of a pa

You are studying the effects of amino acid replacements on the stability of a particular alpha-helix that is buried in the protein myoglobin. You carry out a site-specific mutagen…

You are studying the effects of amino acid replacements on the stability of a pa

You are studying the effects of amino acid replacements on the stability of a particular alpha helix that is buried in the protein myoglobin. You carry out a series of replacement…

You are studying the effects of the enzyme alcohol dehydrogenase (ADH) on the ox

You are studying the effects of the enzyme alcohol dehydrogenase (ADH) on the oxidation of ethanol to acetaldehyde using a spectrophotometer. Your first step is to set up some rea…

You are studying the enzyme alcohol dehydrogenase that catalyzes the following r

You are studying the enzyme alcohol dehydrogenase that catalyzes the following reaction: NAD+ + ethanol ? NADH + H+ + acetaldehyde A) You discover that mercury ion (Hg+) at a conc…

You are studying the evolution of tusk length in a population of African elephan

You are studying the evolution of tusk length in a population of African elephants. You make the tusk-length measurements on 4 different families for whom the adults were captured…

You are studying the evolution of tusk length in a population of African elephan

You are studying the evolution of tusk length in a population of African elephants. You make the tusk-length measurements on 4 different families for whom the adults were captured…

You are studying the export of this protein from the ER via vesicles. In normal

You are studying the export of this protein from the ER via vesicles.   In normal cells, this p77 protein is imported into the ER through a protein translocator and folds into its…

You are studying the expression of genes linked to a segment of the mouse sarcom

You are studying the expression of genes linked to a segment of the mouse sarcoma virus, which is regulated by glucoticoid hormones. You made a series of constructs with the viral…