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The diploid genome in a human somatic cell consists of approximately 6 billion base pairs. (a) If you connected all the chromosomes end-to-end, how long is the DNA in each cell based on the crystallographic dimensions of the DNA double helix? How much does it weigh? (b) If you condensed the entire DNA in a human somatic cell into a sphere, what would the diameter of that sphere be? (Hint: find the volume of the cylindrical DNA string in (a) first). (c) There are approximately ten trillion cells in the human body. What is the total weight of the DNA in your body? If you connected all the DNA in your body into one long string, how many times would it reach to the sun and back? (d) There are about 7 billion humans living on earth. If you connected all their DNA together, how many light years long would that string be? How does that compare to the size of our galaxy, the milky way?
Both endocrine and nervous systems are major regulating system of the body; though, nervous system has been compared to an airmail delivery system and the endocrine system to the pony express. In brief explain this comparison.
A 70-year old woman presents with a one hour history of crushing substernal chest pain. Shortly after admission, the patient expires.
Would the bat be able to tell the distance to a target if, instead of the bat's out going pulse, you returned a broadband noise containing the same frequencies?
Cartenoids are frequently found in foods that are considered to have antioxident properties in human nutrition. What related function do they have in plants.
Explain three examples of wehre fossils have been used to recontruct behavior of extinct animals.
The author of your text describes the gene for sickle cell anemia as being recessive. I prefer to think of it as codominant. What is there about this gene and the way it is expressed that it would best be described as codominant?
What proportion of progeny would PHENOTYPICALLY resemble.
Determine the events that mark the starting and the end of the first interphase period? What happens within the cell in this period?
Draw the tripeptide His Glu Ala, with charges, at pH 5. Recognize the C-terminus, the N-terminus, a peptide bond.
A population is reproductively isolated. Determine which of the following is primarily responsible for the introduction of new alleles at genetic loci into the population?
A semipermeable membrane separates two aqueous solutions at thirty degrees C. For each of the following cases, name the solution into which a net flow of water.
A can of Mountain Dew soda contains 46 g of sugar. Assume that your body completely digests this sugar, 170 kcal of heat energy is available from the sugar. Around how many grams of water will you have to evaporate as sweat to lose this 170 kcal of e..
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