Which of the following substances is completely reabsorbed by the proximal convoluted tubules when it is at normal levels in the blood?
A. sodium
B. potassium
C. glucose
D. water
E. All of the above are completely reabsorbed by the proximal convoluted tubule.
Answer: C. glucose
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Many of the signaling pathways used for communication between cells in complex multicellular organisms first evolved in:
A. unicellular eukaryotes. B. simple multicellular eukaryotes. C. unicellular prokaryotes. D. simple multicellular prokaryotes. E. complex multicellular prokaryotes.
While cataloging fish living in a nearby lake, you find an example of a species that you initially mistake for a hagfish, but further inspection shows that it has a true cerebellum, a rudimentary vertebral column parallel to its notochord, and eggs that are fertilized externally. To what class of fish does this species belong?
a. Chondrichthyes b. Myxini c. Petromyzontida d. Osteichthyes
If two genes are not linked, then the expected phenotypic ratio resulting from a testcross is
A) 9:3:3:1. B) 1:2:1. C) 3:1. D) 1:1:1:1. E) 1:1.
In the ocean, organic matter sinks from the surface to great depths as ________.
A. photosynthetic potential B. particulate debris C. marine snow D. None of the choices are correct.