Describe the structure of DNA.
What will be an ideal response?
The monomer is a nucleotide of deoxyribose, phosphate, and a nitrogenous base. The molecule is double stranded and looks like a ladder. The sides of the ladder are the sugar-phosphate backbone and the rungs of the ladder are the bases. The bases are complementary with adenine (A) pairing with thymine (T) and guanine (G) pairing with cytosine (C). DNA stores the hereditary information for cells.
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The walls of the proximal convoluted tubule (select all correct choices):
A. are composed of epithelial cells with microvilli on their surfaces. B. possess numerous mitochondria. C. use facilitated diffusion to reabsorb glucose and amino acids. D. are where electrolytes are reabsorbed into the blood. E. have a brush border which increases the surface area of the tubule.
A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if DNA gyrase and ATP are added to this DNA?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
Bacterial decomposition of organic nitrogen results in the production of:
a. ammonia. b. nitrates. c. nitrites. d. atmospheric nitrogen. e. urea.
Mary died suddenly of an aortic aneurysm (the sudden bursting of one of the body's largest blood vessels). Which of the following conditions should her children worry most about?
A) Marfan syndrome B) hemophilia C) Turner syndrome D) albinism