The cystic fibrosis gene (CFTR) codes for a protein that is essential for
A) secretion of mucus.
B) ion transport across membranes.
C) transport of oxygen in red blood cells.
D) metabolism of certain amino acids.
E) processing of gangliosides.
B
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Cartilage is different from bone because cartilage:a
is rich in nerves. b. contains veins. c. has a matrix that is composed almost exclusively of collagen. d. contains lymphatic vessels. e. contains arteries.
Which of these statements does NOT describe a characteristic of the genetic code?
A) The number of codons and amino acids is the same. B) The code is used by nearly every living organism. C) Some amino acids have multiple codons. D) The code is degenerate.
Some ___ have enzymes to break the bonds of
atmospheric nitrogen and use it for the metabolism of proteins and other nitrogen containing molecules.
a. fungi b. bacteria c. plants d. protists e. fungi, bacteria, and protists
The nitrogen cycle on land begins with
a. nitrification. b. denitrification. c. decomposition. d. uptake by producers. e. nitrogen fixation