Why is eukaryotic DNA underwound even though eukaryotes lack topoisomerases that can introduce supercoils?
What will be an ideal response?
Formation of a left-handed, solenoidal supercoil requires the removal of about one turn from the DNA. This effect combined with the removal of unbound positive supercoils by topoisomerases leads to a net underwound state.
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The impact of public health measures in the United States has resulted in a/an ________ in infectious disease-related deaths over the past 100 years.
A. no change B. increase C. decrease
In your fertility clinic, you look at the lab results of a young man. He has a prostate gland the size of a golf ball, a fructose-rich semen, and 10 million sperm per ml. His sperm consist of little more than DNA, mitochondria, and a flagellum, with almost no cytoplasm. Also, he has follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in his bloodstream. Which of these is the likely cause of his fertility problems?
A. enlarged prostate gland B. fructose in the semen C. sperm count D. sperm morphology E. FSH and LH
Four of the five answers listed below are parts of the same sense organ. Select the exception
a. cochlea b. cornea c. sclera d. choroid e. fovea
You are looking at diagrams of cells in the process of division and are uncertain as to what process you are viewing (mitosis or meiosis). You determine that the cells you are looking at have 7 chromosomes. You can confidently assume that these cells are
in which phase, based on this odd chromosome number? A) metaphase II B) metaphase C) metaphase I D) All of the above are true.