Transcription in eukaryotes requires which of the following in addition to RNA polymerase?
A) start and stop codons
B) ribosomes and tRNA
C) several transcription factors
D) aminoacyl-tRNA synthetase
C
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The biologically available carbon that is produced within large, lentic rivers and lakes is called ________.
Fill in the blank(s) with the appropriate word(s).
Molecular motors working with microtubules:
a. Are calcium-dependent ATPases b. Use microtubule singlets and doublets c. Use microtubule singlets and triplets d. Two of the above e. None of the above
The invasion of the land by amphibians posed a number of challenges requiring evolutionary innovations. Which one of the following does NOT match a challenge with a corresponding adaptation found in amphibians?
A. The force of gravity was greater without water's buoying effect, selecting for well-muscled legs. B. Eggs dry out in a terrestrial environment, selecting for the amniotic egg. C. Additional oxygen was needed for larger muscles, selecting for the partially-divided heart and pulmonary circuit. D. Gills tend to collapse out of the water, selecting for lungs and cutaneous respiration.
Ethylene oxide is
A. a halogen. B. sporicidal. C. used as an antiseptic against anaerobes. D. the active agent in household bleach. E. only effective with high heat.