A year ago, Kurt lost 30 pounds quite rapidly by severely restricting his calories. Over the months following, he has regained 25 of those pounds. Kurt again cuts radically back on his calorie intake to lose the regained weight. This time, he is having
more difficulty. What has happened to his body composition and his metabolism to create this difficulty?
What will be an ideal response?
When a person severely restricts calories, the body "thinks" is it starving and reduces its metabolic rate by up to 45%. This makes it harder to lose weight by cutting calories. In addition, the recent weight gain is probably mostly fat. Fat tissue is less metabolically active (uses fewer calories) than muscle tissue, so the resting metabolic rate is lower.
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Cytosine deamination is a common mutation that results in a cytosine being converted to a uracil. See Figure (a) below. What is the repair mechanism used to restore the correct base?
A. nucleotide excision repair B. mismatch repair C. base excision repair
You expect to find the lowest overall blood pressure in
A. humans. B. sparrows. C. alligators. D. ostrich. E. salmon.
In the avian and mammalian eye, the lens remains stationary but changes shape in order to focus on objects at various distances. This is called "accommodation" and is accomplished through adjusting muscle control of the lens in order to
A. control the amount of light admitted to the eye through the pupil. B. alter the sensitivity of the eye to varying light levels. C. convert light energy into electrical signals by the retina. D. bend light rays to varying degrees according to the angle at which light enters the eye. E. regulate the vitreous humor volume.
In Southern blotting, DNA fragments on filters must be ____________________ so that probes can
bond with them. Fill in the blank(s) with the appropriate word(s).