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NASA scientists have brought back from Mars a molecule they think is similar to DNA. Just like DNA, it is transcribed into a mRNA-like molecule. Unlike mRNA on Earth, though, it appears to use only three bases (A, C and T). Assuming that proteins were still made from this mRNA molecule and it was thought that 30 Amino Acids existed for this organism, what is the minimum number of bases likely to be in a codon? Explain your answer.
What is an Endoplamic Reticulum.
Most of us can't even imagine a world without oxygen. Though, as you learned earlier, chemically oxygen is a powerful oxidizing compound. What effect(s) would the increase in oxygen levels of atmosphere have on the organisms that existed at that time..
The American Chestnut Tree, which once made up more than 25 percent of North American hardwoodforests, were killed off by a deadly fungal blight that does not affect the closely related AsianChestnut Tree.
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.
20 year old student jason came into the student health center throughout finals complaining of a sore throat, general malaise, and low fever.
Genomic DNA from the nematode worm Caenorhabditis elegans is organized through nucleosomes in the manner typical of eukaryotic genomes, with 145 bp encircling each nucleosome and approximately fifty-five bp in linker DNA.
The net transfer of water between the interstitial fluid and ICF across the plasma membrane, Insects prevent water loss and disturbance in the osmotic balance in cells by.
DNA and RNA are similar yet distinct components of the cell. Describe three differences between RNA and DNA with respect to their chemical composition and structure. Provide a detailed description of each characteristic you chose in your response.
Why is energy from fusion reactors, dissimilar that from fission reactors, so attractive from an environmental perspective. Consider the HIV enzyme called protease. The amino acid residues at the active site are highly hydrophobic.
Suppose that you have engineered a set of genes, each encoiding a protein that altered signal sequence. If the genes were expressed in a cell.
Red flowers are dominant over white flowers. The flower color gene is represented with R/r. Large leafs are dominant over small leaves. The leaf size gene is represented L/l.
The endosymbiont theory suggests that mitochondria and chloroplasts evolved from ancient bacteria that were ingested by primitive nucleated cells.
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