The descending limb of the nephron loop
A) is not permeable to water.
B) responds to high levels of antidiuretic hormone (ADH) in the blood.
C) is permeable to salt and urea.
D) loses water to the medulla as the filtrate becomes more concentrated.
E) pulls water from the renal medulla to make the filtrate more dilute.
D
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The main structure for gas exchange in plants is called the
A. mesophyll. B. chloroplast. C. stomata. D. epidermis. E. root.
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What will be an ideal response?
Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the food source and the hive in reference to the sun. B. angle between the waggle run and the vertical axis within the hive. C. angle between the waggle run in reference to the hive-sun angle. D. angle between the waggle run in reference to the direction north from the hive. E. speed of the waggle dance.
A candy bar contains 108 calories per serving. There are 4 grams of carbohydrate, 5 grams of protein, and 8 grams of fat in a serving. How many of the calories come from fat? Note: One food calorie equals one kilocalorie.
A. 72 B. 16 C. 18 D. 20