Why is water so necessary in metabolism?
What will be an ideal response?
it is polar solvent
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Birds generate a lot of heat, especially during flight. Yet the adipose tissue under their skin and the feathers atop their skin make it difficult to eliminate excess heat across the skin
Which of the following alternatives can absorb body heat and eliminate it from the bird most effectively? A) air in the air sacs B) lymph in the lymphatic vessels C) blood in the vessels D) blood in the heart E) urine in the bladder
The hypothalamus and pituitary link the activities
of the endocrine system and nervous system by a. the secretion of hormones in response to the summation of neural messages that enter the hypothalamus. b. shifts in hormonal concentrations being detected by the anterior pituitary. c. the secretion of pheromones as a response to photoperiodic stimuli. d. the nervous tissue of the anterior lobe sending stimuli to the glandular tissue of the posterior lobe to produce hypothalamic hormones. e. all of these.
The outer membrane of Gram-negative bacteria
A) is a rigid, protective outer shell. B) is also referred to as endotoxin and stimulates fever and shock. C) is the site of nutrient exchange and allows sizes and shapes of molecules to pass through it. D) has the same chemical composition as the cell membrane.
Play inhibits normal behavioral development
Indicate whether the statement is true or false