You are given a piece of connective tissue that you observe to be white, firm, and consists of a matrix of collagen. When chemically analyzed, it is found to contain high concentrations of minerals. What kind of connective tissue is this?
A. bone
B. cartilage
C. adipose
D. dense connective
E. blood
A. bone
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An initiator codon in E. coli is identified by locating:
A. a promoter sequence. B. the 5' cap structure. C. a Shine-Dalgarno sequence. D. a terminator sequence from the previous gene. E. an origin of replication.
In some amniotes, which of the following is a waste product of nitrogen metabolism that is low enough in toxicity that it can be excreted as a semisolid paste, thus reducing water loss?
a. uric acid b. nitric oxide c. ammonium d. squalene
A 67-year-old man, who is an avid gardener, presents at an emergency department. He is suffering from spastic paralysis, which began in his right hand and now extends to his jaw muscles (Lock Jaw). The causative agent of this infection produces a virulence factor with which of the following activities?
A. Blockage of the release of the inhibitory neurotransmitter glycine. B. Blockage of the release of the neurotransmitter acetylcholine from synaptic vesicles. C. Overstimulation of T cells with resulting massive release of cytokines. D. Inhibition of Elongation Factor 2 (EF-2), resulting in inhibition of protein synthesis.
The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are
A. heterotrophs. B. photohemitrophs. C. photoautotrophs. D. photoheterotrophs. E. photoisotrophs.