Substances NOT usually found in normal human urine are
A. certain drugs.
B. urea and uric acid.
C. water molecules.
D. glucose molecules.
E. K+, H+, and other ions.
D. glucose molecules.
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A sterile hybrid plant can form a new fertile species if its chromosomes are doubled. This is referred to as ____
a. allopatric speciation b. cladogenesis c. a hybrid zone d. anagenesis e. sympatric speciation
Important United States marine laboratories on the Atlantic Coast include all except:
a. Woods Hole Marine Biology Laboratory. b. Rosenstiel School of Marine and Atmospheric Science. c. Duke University Marine Laboratory. d. Friday Harbor Laboratory. e. Harbor Branch Oceanographic Institute.
Each nephron of the kidney consists of a long tubule and associated small blood vessels. Blood cells and plasma proteins are too large to enter with the glomerular filtrate. What is the correct path for the filtrate to follow through the nephron in the production of urine?
A. Bowman's capsule ? distal convoluted tubule ? loop of Henle ? proximal convoluted tubule ? collecting duct B. Bowman's capsule ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule ? collecting duct C. Bowman's capsule ? loop of Henle ? proximal convoluted tubule ? distal convoluted tubule ? collecting duct D. Bowman's capsule ? collecting duct ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule E. collecting duct ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule? Bowman's capsule
Why are enzymes important to biological systems?
a. Enzymes are reuseable. b. Enzymes prevent unwanted chemical by-products from forming. c. Enzymes increase the energy barrier required of chemical reactions. d. Enzymes decrease the amount of activation energy required for chemical reactions to occur.