Which of the following statements about plant embryo development is correct?
A. The suspensor forms from the shoot apical meristem before development of the root apical meristem.
B. The development of the shoot and root apical meristems is controlled independently.
C. The plant hormone abscisic acid is important in the development of the shoot-root axis.
D. The protoderm establishes the procambium tissue in the young plant embryo.
B. The development of the shoot and root apical meristems is controlled independently.
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The process of translation refers to the use of information encoded in ____ to make ____
a. RNA; a complementary DNA copy b. DNA; a polypeptide c. DNA; a complementary RNA copy d. a polypeptide; RNA e. RNA; a polypeptide
The nodes of a phylogenetic tree represent
a. the extinct ancestor of extant species. b. the point in time which two species diverged. c. the evolution of a new phenotype. d. a horizontal gene transfer event.
Seawater typically is
a. highly basic. b. neutral. c. somewhat basic. d. somewhat acidic. e. highly basic.
Groups of three consecutive bases along the DNA of a gene have the code for one ________.
A. amino acid B. nucleotide C. purine D. protein