For acid rainwater, which has a pH as low as 3.0, which of the following is true?
a. [H+] < [OH?]
b. [H+] = [OH?]
c. [H+] = 0
d. [OH?] = 0
e. [H+] > [OH?]
E
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Humans and chimpanzees last shared a common ancestor around _____ million years ago, and our genomes now differ by about _____%
A. 5-7; 1 B. 5-7; 10 C. 10-20; 1 D. 10-20; 10 E. 20-50; 50
Proximity of capillaries to tissue cells is crucial
because a. bulk flow operates to move protein-free plasma through clefts between endothelial cells. b. red cells have to squeeze single file through capillaries. c. some proteins exit capillaries by endocytosis and exocytosis. d. this is where nutrient and waste exchange occur. e. all of these are true.
Select all functions performed by both the male and female reproductive system in humans.
A. protect and nourish the developing fetus B. produce sex hormones C. nourish the offspring with milk D. produce gametes
Why are the functions of the liver?
A) converts amino groups from excess amino acids to urea B) regulates blood glucose by producing or breaking down glycogen C) produces and secretes bile D) stores iron and certain vitamins E) produces and secretes digestive enzymes