Messenger RNA is a(n) ____ of the amino acid-coding nucleotide sequence of a gene
a. exact copy of the DNA template
b. exact copy of the tRNA template
c. double-stranded complementary copy
d. single-stranded complementary copy
e. single-stranded anti-complementary copy
d
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Which of the following statements is not true of early plant evolution, as we have learned from Rhynie cherts?
A. Early vascular plants were small, up to 15 cm tall. B. Early vascular plants branched repeatedly and contained sporangia at their tips. C. The stems of early vascular plants lacked a cuticle or stomata. D. Some of the early plants have a branched sporophyte, but no evidence of vascular tissue. E. Fossils indicate that the roots and leaves of lycophytes evolved independently from those of ferns, horsetails, and seed plants.
The largest group of proteobacteria are the ________.
A. delta proteobacteria B. beta proteobacteria C. gamma proteobacteria D. alpha proteobacteria
The world ocean covers ________ of Earth's surface
a. 94% b. 71% c. 46% d. 68%
"She got some chromosomes from her grandfather and some from her grandmother." This is best explained by
A. independent assortment. B. cross-over. C. mitosis. D. linked genes.