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One way of regulating eukaryotic gene expression is to control the life time of the messenger RNA. mRNA degradation occurs by different mechanisms.
A single gene controls color. When you crossed pure-breeding white-horned individuals with a pure-breeding black-horned ones, you got all gray-horned F1 offspring. You then crossed the gray-horned
In a population of 100 Walruses, 30 have short whiskers (the recessive trait). The rest of the walruses have long whiskers (the dominant trait) with 30 heterozygotes.
In fruit flies, the gene for eye color is sex-linked (X-chromosome) and red eye color is dominant over white. The gene for body color is an autosomal trait with gray dominant over black.
A third gene, designated C, is located 15 mu from B and 5 mu from A. A parental generation consisting of AAbbCC and aaBBcc individuals were crossed to each other. The F1 heterozygotes were then test
The human genome project initially predicted 100,000 genes due to the number of proteins found through western blots. When near completion, computer analysis of the sequence predicted only 30,000 ge
Parasites such as pinworms are often found in high densities in select human populations. What are the abiotic factors that you may consider if trying to control this parasite in a day care.
There are three main types of coat protein associated with transport vesicles. What is the general purpose of these coat proteins. and where would each of the three types be found in the exocytotic
After observing growth of a gram-negative organisms on a phenylethanol plate, does this negate the usefulness of phenylethanol as a selective medium. Why or why not.
Describe antigen-antibody selection, recognition in humerol immunity. Same question in cell-mediated immunity.
Define and contrast specific and non-specific immune responses. Explain what the main differences are.
Suppose that you transform a different strain of yeast (which does not contain these types of transposable elements) with each of the newly discovered transposable elements. You let each of the elem
In a biochemical pathway, three ATP molecules are hydrolyzed. The endergonic reactions in the pathway require a total of 17.3 kcal/mole of energy to drive the reactions of the pathway.
A heterzygous plant ABCDE/abcde is crossed with an abcde/abcde plant. Only the following progeny are found in the F1: ABCDE/abcde, abcde/abcde, Abcde/abcde, aBCDE/abcde, ABCDe/abcde, and abcdE/abcde.
In the f2 generation, how many genotypic classes could be generated from a dihybrid cross of two heterozygotes in which the genes involved show complete dominance
The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER,
In the diversity and abundance of bacteria, we always have some uncertainty about the identity of an isolate. With this in mind, how can we be certain that growth with a metallic sheen is truly a co
You suspect that Michael has sickle cell anemia and you have ordered an isoelectric focusing analysis of the child's lysed red blood cells. (Lysing the red blood cells releases the hemoglobin.)
what would you expect to happen to the virulence of lyme disease in humans if the pathogen that cause it ( a spirochete bacterium) were to become sexually transmissible between humans
The bacterium Helicobactor pylori naturally grows in human and animal stomachs at pH about 2. It will grow also at pH 2 and pH 7 in culture media. It's genome sequence has been determined and annota
Are they necessarily required or simply an artefact of the evolutionary history of eukaryotes. Why, for example, would eukaryotic cells require a membrane-bound nucleus when prokaryotes seem to repl
Suppose that a duplex DNA molecule undergoes two double-stranded breaks that tightly flank the promoter of a gene and that the promoter region is inverted prior to enzymatic repair of the breaks.
What are the four major mechanoreceptors in the skin. How would these receptors contribute to our ability of sensing a giant apple in our hands and why
A patient has a spinal injury which damages the left dorsal medial column at C7 region. What kinds of sensations may be impaired in patient's left foot and arm, and why
Why do you think it is necessary to use a thermostable form of DNA polymerase (e.g. Taq polymerase) used in PCR. Is it necessary to use a thermostable form of DNA polymerase in the techniques of did