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Q. Bryophytes and fern allies were most prevalent during early plant evolution; however, many of these plants have been replaced by vascular plants. These "lower" plants possess flagellated sperm that have to swim through an aqueous medium to reach and fertilize eggs. From this information, in what kinds of habitat will you expect these plants to happen when they were abundant? On the other hand, vascular plants became dominant during the invasion of what type of habitat? What structures allowed them to infiltrate this new environment?
Brown color in mice is dominant over albinism. In a given cross between a brown and albino, six brown and five albino offspring are produced. What was the genotype of the original brown parent?
What organelle does DAPI stain? Describe the staining pattern when the cells were stained with DAPI. Also, determine where the organelle stained by DAPI should be localized. Did your results conform to this information? Why or why not?
What is the difference between orthologs and paralogs and why are only orthologous comparisons useful for determining evolutionary relationships?
In an autophagy-related disease, a person's cells over-express ATGs. Describe how scientist might use RNA to combat this disease.
Post an example of how bacteria are used to combat.
Computer programs that scan double-stranded DNA for regions that potentially encode polypeptides have been developed. How many potential reading frames do these programs have to explore to find all possible encoded polypeptides? Explain.
How many high-energy triphosphates are formed by substratelevel phosphorylation during each turn of the TCA cycle (consider the TCA cycle reactions only)? How many are formed as the result of oxidative phosphorylation? How many molecules of CO2 ar..
Describe how the evolution of roots and simple vascular transport expanded the habitat of plants onto land.
Which of the following genotypes due to nondisjunction of sex chromosomes is lethal?
You have four colonies of mice that are independent of each other. Each has a true-breeding mutation resulting in a short tail. For each colony, the short tail phenotype is recessive to the wild-type long-tail phenotype.
The trend in the U.S. is having children later in life than previous generations. What effects may this trend have on the incidence of late-acting dominant lethal alleles in the population.
Glucose is frequently administered intravenonusly to patients as a food source. A new resident at the hospital suggests administering glucose-6-phosphate instead. Glucose-6-phosphate requires ATP and you consider the possibility that administering..
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