Streptomyces
A. may produce antibiotics.
B. may produce geosmins.
C. will swarm together to form fruiting bodies.
D. are typically found in the soil.
E. may produce antibiotics, may produce geosmins AND are typically found in the soil.
E. may produce antibiotics, may produce geosmins AND are typically found in the soil.
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The difference between a Class I and a Class II tRNA synthetase is:
A. the Class I synthetase requires ATP cofactor and the Class II does not. B. the Class I synthetase uses the 2'-OH of 3' end of the tRNA as a nucleophile and the Class II uses the 3'-OH. C. the Class II synthetase reaction requires a transesterification reaction not necessary in the Class I reaction. D. the Class II synthetases are typically monomeric, whereas the Class I enzymes frequently function as multimeric protein complexes.
The organelle that pinches off portions of its
membrane to form a vesicle used for storage or transport is the
a. mitochondrion. b. chloroplast. c. nucleus. d. Golgi body. e. ribosome
Myelin speeds the conduction of action potentials along a neuron by
A) lowering the threshold at which action potentials are generated. B) allowing the action potential to "jump" over sections of the axon. C) inserting additional voltage-gated K+ channels into the membrane. D) increasing the resting membrane potential. E) increasing the diameter of the axon.
Bacteria in the phylum Firmicutes are distinguished from the phylum Actinobacteria on the basis of
A) their Gram stain reaction. B) the high G + C content of their DNA. C) their spiral shapes. D) the low G + C content of their DNA. E) the presence of LPS in their membranes.