An enzyme is a protein that functions as a biological catalyst.
a. true
b. false
Answer: a. true
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Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the food source and the hive in reference to the sun. B. angle between the waggle run and the vertical axis within the hive. C. angle between the waggle run in reference to the hive-sun angle. D. angle between the waggle run in reference to the direction north from the hive. E. speed of the waggle dance.
The genes involved in tumorigenesis constitute a specific subset of the genome whose products are involved in which of the following activities?
a) apoptosis b) adhesion of a cell to its neighbors c) all of the choices are correct d) repair of DNA damage e) progression of a cell through the cell cycle
Exotic species that are introduced into a non-native habitat can ____.
A. interbreed with native species B. drive endemic species to extinction C. die out due to competition from native species D. blend in with endemic species E. create habitat islands for themselves
Eukaryotic siRNAs originate from
a. viral infection. b. siRNA-encoding genes that produce a transcript that is processed into many small RNAs. c. degraded messenger RNAs. d. siRNA-encoding genes that produce a transcript that folds to become double-stranded. e. introns removed during mRNA processing.