In the golden-winged sunbird (Nectarina reichenowi), defending a territory saved the bird 780 calories a day in reduced foraging activity, but cost the bird 728 calories in defense of the territory. The net change in calories due to territorial behavior was
A. 53
B. 1,508
C. -53 (no gain)
D. 52
E. -52 (no gain)
D. 52
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Could two phenotypically normal parents have a child with cystic fibrosis?
a. Yes b. No
The wood of conifers consists mostly of tracheids
____________________ Indicate whether the statement is true or false.
Nate is gaining weight, is often tired, and feels cold. His thyroid hormone level is high as is the level of TSH. Nate also has a goiter. Which of these diagnoses is the most likely for Nate's condition?
A) defective thyroid hormone receptors in his body cells B) insufficient iodine in his diet C) defective receptors for thyroid hormone control by the anterior pituitary D) too much iodine in the diet
All of the following cell types are correctly matched with their functions except
a. mesophyll-photosynthesis. b. guard cell-regulation of transpiration. c. sieve-tube member-translocation. d. vessel element-water transport. e. companion cell-formation of secondary xylem and phloem.