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We now know that the gene for flower color and the gene for seed color are both on chromosome 1 of the pea plants once studied by Mendel. According to Mendel's results, flower color and seed color undergo independent assortment. Which of the following explanations is most likely?Answer
a. During a round of meiosis, the female part of a flower failed to separate a homologous pair forcing the seed color gene to pair up with the flower color gene.
b. These genes are so far apart on chromosome 1 that they undergo independent assortment.
c. Nonhomologous chromosomes containing the two genes underwent crossing over to create a new "hybrid" chromosome containing both genes.
d. Between the time that Mendel studied peas and modern times, one of the genes was translocated onto chromosome 1 so that in modern times two genes that were once on separate chromosomes are now linked.
Explain what is meant by state the genetic code is triplet and nonoverlapping? What did the finding that DNA base compositions varied greatly among different organisms suggest about the genetic code.
Four proteins, each containing a single polypeptide, are separated by SDS-PAGE: human cytochrome c (MW 13,000), human serum albumin (MW 67,000), bovine myoglobin (MW 16,890), and human apolipoprotein B (MW 513,000). Which one would show up as the ..
Freediving is an activity in which a person dives, sometimes to great depth, without use of scuba gear. The diver must hold his or her breath for the duration of dive.
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You obtain the pigments called carotenoids in your diet when you eat carrots. Why do carotenoids appear yellow and orange?
Draw a chain of 2 RNA nucleotides. Use R for the nitrogenous bases. Then, briefly explain why RNA is usually single-stranded and why it is less stable than DNA. Modify the drawing before to explain.
Explain, in general terms, the role of RNA in gene expression. Why is RNA useful to a cell? What is the benefit of using RNA instead of just directly producing protein from the instructions in DNA?
Movement of glucose from one side to the other side of the intestinal epithelium is a major example of transcellular transport.
Why is it necessary to locate an object first using the scanning or low power objective and then, if necessary, change to the high power objective?
Barbara McClintock, famous for discovering that genes might move within genomes, had her meticulous work ignored for nearly 4 decades, but eventually won the Nobel Prize. Why was her work so distrusted.
Water at room temperature is placed in flask connected through rubber tubing to a vacuum pump and the pump is turned on.
Which groups of foods are underrepresented or overrepresented in your diet? If you did not consume the recommended number of servings from each group, explain why. Propose how you might consume the recommended number of servings from each group in th..
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