Assemblages of abiotically produced polymers are called:a
stomatolites.
b. protobionts.
c. polyribosomes.
d. endosymbionts.
e. ribozymes.
B
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What is the minimal number of tRNAs that can be used to recognize all of the codons for threonine?
A. 1 B. 2 C. 3 D. 4
Of the following, which is likely the most direct ancestor of modern humans?
a. Homo habilis b. Australopithecus garhi c. Homo erectus d. Australopithecus afarensis e. Homo neanderthalis
Insect workers propagate more of their own alleles by helping their mother reproduce rather than by reproducing themselves; thus, they share a larger fraction of their ___________ with the next generation.
A. food resources B. time C. genome D. ability to defend their nest E. home
The sense of touch
A. is evenly distributed over the surface of the body. B. consists of very few receptor cells in very specific places, like the tips of the fingers. C. is relatively unimportant. D. includes pressure, temperature, and pain receptors.