The major reductive amination pathway for incorporation of nitrogen into amino acids initially involves the production of ________ from alpha-ketoglutarate.
A. arginine
B. cysteine
C. tryptophan
D. glutamate
Answer: D
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Refer to Figure 44-1 in the book. To which group are sponges more closely related?
A. choanoflagellates B. bilaterians C. equal relationship to both choanoflagellates and biletarians
The strongest chemical bonds are
A. hydrogen bonds. B. Van der Waal forces. C. hydrophobic interactions. D. ionic bonds. E. covalent bonds.
Sensory receptors:a
produce internal environmental stimuli. b. convert stimulus energy to electrical energy. c. maintain a constantly hyperpolarized plasma membrane. d. produce a small amount of energy on a continual basis. e. produce action potentials of varying amplitudes in response to stimuli of differing intensities.
A primary transcript in the nucleus of a eukaryotic cell is _____ the functional mRNA, while a primary transcript in a prokaryotic cell is _____ the functional mRNA
A) the same size as; smaller than B) larger than; the same size as C) larger than; smaller than D) the same size as; larger than